Introduce EndpointID to enforce naming rules

Add an `EndpointID` class to enforce the naming rules that we support
for actuator endpoints. We now ensure that all endpoint names contain
only letters and numbers and must begin with a lower-case letter.

Existing public classes and interfaces have been changes so that String
based `endpointId` methods are deprecated and strongly typed versions
are preferred instead. A few public classes that we're not expecting
to be used directly have been changed without deprecated methods being
introduced.

See gh-14773

spring-boot-project/spring-boot-actuator-autoconfigure/src/main/java/org/springframework/boot/actuate/autoconfigure/cloudfoundry/AccessLevel.java

@@ -40,19 +40,19 @@ public enum AccessLevel {
 
 	public static final String REQUEST_ATTRIBUTE = "cloudFoundryAccessLevel";
 
-	private final List<String> endpointIds;
+	private final List<String> ids;
 
-	AccessLevel(String... endpointIds) {
-		this.endpointIds = Arrays.asList(endpointIds);
+	AccessLevel(String... ids) {
+		this.ids = Arrays.asList(ids);
 	}
 
 	/**
-	 * Returns if the access level should allow access to the specified endpoint path.
-	 * @param endpointId the endpoint ID to check
+	 * Returns if the access level should allow access to the specified ID.
+	 * @param id the ID to check
 	 * @return {@code true} if access is allowed
 	 */
-	public boolean isAccessAllowed(String endpointId) {
-		return this.endpointIds.isEmpty() || this.endpointIds.contains(endpointId);
+	public boolean isAccessAllowed(String id) {
+		return this.ids.isEmpty() || this.ids.contains(id);
 	}
 
 }

spring-boot-project/spring-boot-actuator-autoconfigure/src/main/java/org/springframework/boot/actuate/autoconfigure/cloudfoundry/reactive/CloudFoundrySecurityInterceptor.java

@@ -59,7 +59,7 @@ class CloudFoundrySecurityInterceptor {
 		this.applicationId = applicationId;
 	}
 
-	Mono<SecurityResponse> preHandle(ServerWebExchange exchange, String endpointId) {
+	Mono<SecurityResponse> preHandle(ServerWebExchange exchange, String id) {
 		ServerHttpRequest request = exchange.getRequest();
 		if (CorsUtils.isPreFlightRequest(request)) {
 			return SUCCESS;
@@ -72,7 +72,7 @@ class CloudFoundrySecurityInterceptor {
 			return Mono.error(new CloudFoundryAuthorizationException(
 					Reason.SERVICE_UNAVAILABLE, "Cloud controller URL is not available"));
 		}
-		return check(exchange, endpointId).then(SUCCESS).doOnError(this::logError)
+		return check(exchange, id).then(SUCCESS).doOnError(this::logError)
 				.onErrorResume(this::getErrorResponse);
 	}
 
@@ -80,13 +80,13 @@ class CloudFoundrySecurityInterceptor {
 		logger.error(ex.getMessage(), ex);
 	}
 
-	private Mono<Void> check(ServerWebExchange exchange, String path) {
+	private Mono<Void> check(ServerWebExchange exchange, String id) {
 		try {
 			Token token = getToken(exchange.getRequest());
 			return this.tokenValidator.validate(token)
 					.then(this.cloudFoundrySecurityService
 							.getAccessLevel(token.toString(), this.applicationId))
-					.filter((accessLevel) -> accessLevel.isAccessAllowed(path))
+					.filter((accessLevel) -> accessLevel.isAccessAllowed(id))
 					.switchIfEmpty(Mono.error(new CloudFoundryAuthorizationException(
 							Reason.ACCESS_DENIED, "Access denied")))
 					.doOnSuccess((accessLevel) -> exchange.getAttributes()

spring-boot-project/spring-boot-actuator-autoconfigure/src/main/java/org/springframework/boot/actuate/autoconfigure/cloudfoundry/reactive/CloudFoundryWebFluxEndpointHandlerMapping.java

@@ -27,6 +27,7 @@ import reactor.core.publisher.Mono;
 
 import org.springframework.boot.actuate.autoconfigure.cloudfoundry.AccessLevel;
 import org.springframework.boot.actuate.autoconfigure.cloudfoundry.SecurityResponse;
+import org.springframework.boot.actuate.endpoint.EndpointId;
 import org.springframework.boot.actuate.endpoint.web.EndpointLinksResolver;
 import org.springframework.boot.actuate.endpoint.web.EndpointMapping;
 import org.springframework.boot.actuate.endpoint.web.EndpointMediaTypes;
@@ -70,7 +71,7 @@ class CloudFoundryWebFluxEndpointHandlerMapping
 	protected ReactiveWebOperation wrapReactiveWebOperation(ExposableWebEndpoint endpoint,
 			WebOperation operation, ReactiveWebOperation reactiveWebOperation) {
 		return new SecureReactiveWebOperation(reactiveWebOperation,
-				this.securityInterceptor, endpoint.getId());
+				this.securityInterceptor, endpoint.getEndpointId());
 	}
 
 	@Override
@@ -113,10 +114,11 @@ class CloudFoundryWebFluxEndpointHandlerMapping
 
 		private final CloudFoundrySecurityInterceptor securityInterceptor;
 
-		private final String endpointId;
+		private final EndpointId endpointId;
 
 		SecureReactiveWebOperation(ReactiveWebOperation delegate,
-				CloudFoundrySecurityInterceptor securityInterceptor, String endpointId) {
+				CloudFoundrySecurityInterceptor securityInterceptor,
+				EndpointId endpointId) {
 			this.delegate = delegate;
 			this.securityInterceptor = securityInterceptor;
 			this.endpointId = endpointId;
@@ -125,7 +127,8 @@ class CloudFoundryWebFluxEndpointHandlerMapping
 		@Override
 		public Mono<ResponseEntity<Object>> handle(ServerWebExchange exchange,
 				Map<String, String> body) {
-			return this.securityInterceptor.preHandle(exchange, this.endpointId)
+			return this.securityInterceptor
+					.preHandle(exchange, this.endpointId.toLowerCaseString())
 					.flatMap((securityResponse) -> flatMapResponse(exchange, body,
 							securityResponse));
 		}

spring-boot-project/spring-boot-actuator-autoconfigure/src/main/java/org/springframework/boot/actuate/autoconfigure/cloudfoundry/servlet/CloudFoundrySecurityInterceptor.java

@@ -28,6 +28,7 @@ import org.springframework.boot.actuate.autoconfigure.cloudfoundry.CloudFoundryA
 import org.springframework.boot.actuate.autoconfigure.cloudfoundry.CloudFoundryAuthorizationException.Reason;
 import org.springframework.boot.actuate.autoconfigure.cloudfoundry.SecurityResponse;
 import org.springframework.boot.actuate.autoconfigure.cloudfoundry.Token;
+import org.springframework.boot.actuate.endpoint.EndpointId;
 import org.springframework.http.HttpMethod;
 import org.springframework.http.HttpStatus;
 import org.springframework.util.StringUtils;
@@ -59,7 +60,7 @@ class CloudFoundrySecurityInterceptor {
 		this.applicationId = applicationId;
 	}
 
-	SecurityResponse preHandle(HttpServletRequest request, String endpointId) {
+	SecurityResponse preHandle(HttpServletRequest request, EndpointId endpointId) {
 		if (CorsUtils.isPreFlightRequest(request)) {
 			return SecurityResponse.success();
 		}
@@ -90,12 +91,14 @@ class CloudFoundrySecurityInterceptor {
 		return SecurityResponse.success();
 	}
 
-	private void check(HttpServletRequest request, String endpointId) throws Exception {
+	private void check(HttpServletRequest request, EndpointId endpointId)
+			throws Exception {
 		Token token = getToken(request);
 		this.tokenValidator.validate(token);
 		AccessLevel accessLevel = this.cloudFoundrySecurityService
 				.getAccessLevel(token.toString(), this.applicationId);
-		if (!accessLevel.isAccessAllowed(endpointId)) {
+		if (!accessLevel.isAccessAllowed(
+				(endpointId != null) ? endpointId.toLowerCaseString() : "")) {
 			throw new CloudFoundryAuthorizationException(Reason.ACCESS_DENIED,
 					"Access denied");
 		}

spring-boot-project/spring-boot-actuator-autoconfigure/src/main/java/org/springframework/boot/actuate/autoconfigure/cloudfoundry/servlet/CloudFoundryWebEndpointServletHandlerMapping.java

@@ -27,6 +27,7 @@ import javax.servlet.http.HttpServletResponse;
 
 import org.springframework.boot.actuate.autoconfigure.cloudfoundry.AccessLevel;
 import org.springframework.boot.actuate.autoconfigure.cloudfoundry.SecurityResponse;
+import org.springframework.boot.actuate.endpoint.EndpointId;
 import org.springframework.boot.actuate.endpoint.web.EndpointLinksResolver;
 import org.springframework.boot.actuate.endpoint.web.EndpointMapping;
 import org.springframework.boot.actuate.endpoint.web.EndpointMediaTypes;
@@ -68,7 +69,7 @@ class CloudFoundryWebEndpointServletHandlerMapping
 	protected ServletWebOperation wrapServletWebOperation(ExposableWebEndpoint endpoint,
 			WebOperation operation, ServletWebOperation servletWebOperation) {
 		return new SecureServletWebOperation(servletWebOperation,
-				this.securityInterceptor, endpoint.getId());
+				this.securityInterceptor, endpoint.getEndpointId());
 	}
 
 	@Override
@@ -76,7 +77,7 @@ class CloudFoundryWebEndpointServletHandlerMapping
 	protected Map<String, Map<String, Link>> links(HttpServletRequest request,
 			HttpServletResponse response) {
 		SecurityResponse securityResponse = this.securityInterceptor.preHandle(request,
-				"");
+				null);
 		if (!securityResponse.getStatus().equals(HttpStatus.OK)) {
 			sendFailureResponse(response, securityResponse);
 		}
@@ -115,10 +116,11 @@ class CloudFoundryWebEndpointServletHandlerMapping
 
 		private final CloudFoundrySecurityInterceptor securityInterceptor;
 
-		private final String endpointId;
+		private final EndpointId endpointId;
 
 		SecureServletWebOperation(ServletWebOperation delegate,
-				CloudFoundrySecurityInterceptor securityInterceptor, String endpointId) {
+				CloudFoundrySecurityInterceptor securityInterceptor,
+				EndpointId endpointId) {
 			this.delegate = delegate;
 			this.securityInterceptor = securityInterceptor;
 			this.endpointId = endpointId;

spring-boot-project/spring-boot-actuator-autoconfigure/src/main/java/org/springframework/boot/actuate/autoconfigure/endpoint/ExposeExcludePropertyEndpointFilter.java

@@ -110,7 +110,7 @@ public class ExposeExcludePropertyEndpointFilter<E extends ExposableEndpoint<?>>
 	}
 
 	private boolean contains(Set<String> items, ExposableEndpoint<?> endpoint) {
-		return items.contains(endpoint.getId().toLowerCase(Locale.ENGLISH));
+		return items.contains(endpoint.getEndpointId().toLowerCaseString());
 	}
 
 }

spring-boot-project/spring-boot-actuator-autoconfigure/src/main/java/org/springframework/boot/actuate/autoconfigure/endpoint/jmx/DefaultEndpointObjectNameFactory.java

@@ -52,7 +52,8 @@ class DefaultEndpointObjectNameFactory implements EndpointObjectNameFactory {
 			throws MalformedObjectNameException {
 		StringBuilder builder = new StringBuilder(this.properties.getDomain());
 		builder.append(":type=Endpoint");
-		builder.append(",name=" + StringUtils.capitalize(endpoint.getId()));
+		builder.append(
+				",name=" + StringUtils.capitalize(endpoint.getEndpointId().toString()));
 		String baseName = builder.toString();
 		if (this.mBeanServer != null && hasMBean(baseName)) {
 			builder.append(",context=" + this.contextId);

spring-boot-project/spring-boot-actuator-autoconfigure/src/main/java/org/springframework/boot/actuate/autoconfigure/endpoint/web/MappingWebEndpointPathMapper.java

@@ -18,6 +18,7 @@ package org.springframework.boot.actuate.autoconfigure.endpoint.web;
 
 import java.util.Map;
 
+import org.springframework.boot.actuate.endpoint.EndpointId;
 import org.springframework.boot.actuate.endpoint.web.PathMapper;
 
 /**
@@ -35,8 +36,14 @@ class MappingWebEndpointPathMapper implements PathMapper {
 	}
 
 	@Override
+	@Deprecated
 	public String getRootPath(String endpointId) {
-		return this.pathMapping.getOrDefault(endpointId, endpointId);
+		return getRootPath(EndpointId.of(endpointId));
+	}
+
+	@Override
+	public String getRootPath(EndpointId endpointId) {
+		return this.pathMapping.getOrDefault(endpointId, endpointId.toLowerCaseString());
 	}
 
 }

spring-boot-project/spring-boot-actuator-autoconfigure/src/main/java/org/springframework/boot/actuate/autoconfigure/security/reactive/EndpointRequest.java

@@ -31,6 +31,7 @@ import reactor.core.publisher.Mono;
 
 import org.springframework.beans.factory.NoSuchBeanDefinitionException;
 import org.springframework.boot.actuate.autoconfigure.endpoint.web.WebEndpointProperties;
+import org.springframework.boot.actuate.endpoint.EndpointId;
 import org.springframework.boot.actuate.endpoint.annotation.Endpoint;
 import org.springframework.boot.actuate.endpoint.web.PathMappedEndpoints;
 import org.springframework.boot.security.reactive.ApplicationContextServerWebExchangeMatcher;
@@ -208,9 +209,12 @@ public final class EndpointRequest {
 					.map(pathMappedEndpoints::getPath);
 		}
 
-		private String getEndpointId(Object source) {
+		private EndpointId getEndpointId(Object source) {
+			if (source instanceof EndpointId) {
+				return (EndpointId) source;
+			}
 			if (source instanceof String) {
-				return (String) source;
+				return (EndpointId.of((String) source));
 			}
 			if (source instanceof Class) {
 				return getEndpointId((Class<?>) source);
@@ -218,12 +222,12 @@ public final class EndpointRequest {
 			throw new IllegalStateException("Unsupported source " + source);
 		}
 
-		private String getEndpointId(Class<?> source) {
+		private EndpointId getEndpointId(Class<?> source) {
 			Endpoint annotation = AnnotatedElementUtils.getMergedAnnotation(source,
 					Endpoint.class);
 			Assert.state(annotation != null,
 					() -> "Class " + source + " is not annotated with @Endpoint");
-			return annotation.id();
+			return EndpointId.of(annotation.id());
 		}
 
 		private List<ServerWebExchangeMatcher> getDelegateMatchers(Set<String> paths) {

spring-boot-project/spring-boot-actuator-autoconfigure/src/main/java/org/springframework/boot/actuate/autoconfigure/security/servlet/EndpointRequest.java

@@ -31,6 +31,7 @@ import javax.servlet.http.HttpServletRequest;
 
 import org.springframework.beans.factory.NoSuchBeanDefinitionException;
 import org.springframework.boot.actuate.autoconfigure.endpoint.web.WebEndpointProperties;
+import org.springframework.boot.actuate.endpoint.EndpointId;
 import org.springframework.boot.actuate.endpoint.annotation.Endpoint;
 import org.springframework.boot.actuate.endpoint.web.PathMappedEndpoints;
 import org.springframework.boot.autoconfigure.security.servlet.RequestMatcherProvider;
@@ -256,9 +257,12 @@ public final class EndpointRequest {
 					.map(pathMappedEndpoints::getPath);
 		}
 
-		private String getEndpointId(Object source) {
+		private EndpointId getEndpointId(Object source) {
+			if (source instanceof EndpointId) {
+				return (EndpointId) source;
+			}
 			if (source instanceof String) {
-				return (String) source;
+				return (EndpointId.of((String) source));
 			}
 			if (source instanceof Class) {
 				return getEndpointId((Class<?>) source);
@@ -266,12 +270,12 @@ public final class EndpointRequest {
 			throw new IllegalStateException("Unsupported source " + source);
 		}
 
-		private String getEndpointId(Class<?> source) {
+		private EndpointId getEndpointId(Class<?> source) {
 			Endpoint annotation = AnnotatedElementUtils.getMergedAnnotation(source,
 					Endpoint.class);
 			Assert.state(annotation != null,
 					() -> "Class " + source + " is not annotated with @Endpoint");
-			return annotation.id();
+			return EndpointId.of(annotation.id());
 		}
 
 		private List<RequestMatcher> getDelegateMatchers(

spring-boot-project/spring-boot-actuator-autoconfigure/src/test/java/org/springframework/boot/actuate/autoconfigure/cloudfoundry/CloudFoundryWebEndpointDiscovererTests.java

@@ -23,6 +23,7 @@ import java.util.function.Function;
 
 import org.junit.Test;
 
+import org.springframework.boot.actuate.endpoint.EndpointId;
 import org.springframework.boot.actuate.endpoint.InvocationContext;
 import org.springframework.boot.actuate.endpoint.SecurityContext;
 import org.springframework.boot.actuate.endpoint.annotation.Endpoint;
@@ -57,7 +58,7 @@ public class CloudFoundryWebEndpointDiscovererTests {
 			Collection<ExposableWebEndpoint> endpoints = discoverer.getEndpoints();
 			assertThat(endpoints.size()).isEqualTo(2);
 			for (ExposableWebEndpoint endpoint : endpoints) {
-				if (endpoint.getId().equals("health")) {
+				if (endpoint.getEndpointId().equals(EndpointId.of("health"))) {
 					WebOperation operation = endpoint.getOperations().iterator().next();
 					assertThat(operation.invoke(new InvocationContext(
 							mock(SecurityContext.class), Collections.emptyMap())))

spring-boot-project/spring-boot-actuator-autoconfigure/src/test/java/org/springframework/boot/actuate/autoconfigure/cloudfoundry/reactive/ReactiveCloudFoundryActuatorAutoConfigurationTests.java

@@ -33,6 +33,7 @@ import org.springframework.boot.actuate.autoconfigure.endpoint.EndpointAutoConfi
 import org.springframework.boot.actuate.autoconfigure.endpoint.web.WebEndpointAutoConfiguration;
 import org.springframework.boot.actuate.autoconfigure.health.HealthEndpointAutoConfiguration;
 import org.springframework.boot.actuate.autoconfigure.web.server.ManagementContextAutoConfiguration;
+import org.springframework.boot.actuate.endpoint.EndpointId;
 import org.springframework.boot.actuate.endpoint.ExposableEndpoint;
 import org.springframework.boot.actuate.endpoint.annotation.Endpoint;
 import org.springframework.boot.actuate.endpoint.annotation.ReadOperation;
@@ -243,9 +244,10 @@ public class ReactiveCloudFoundryActuatorAutoConfigurationTests {
 							context);
 					Collection<ExposableWebEndpoint> endpoints = handlerMapping
 							.getEndpoints();
-					List<String> endpointIds = endpoints.stream()
-							.map(ExposableEndpoint::getId).collect(Collectors.toList());
-					assertThat(endpointIds).contains("test");
+					List<EndpointId> endpointIds = endpoints.stream()
+							.map(ExposableEndpoint::getEndpointId)
+							.collect(Collectors.toList());
+					assertThat(endpointIds).contains(EndpointId.of("test"));
 				});
 	}
 
@@ -261,7 +263,8 @@ public class ReactiveCloudFoundryActuatorAutoConfigurationTests {
 					Collection<ExposableWebEndpoint> endpoints = handlerMapping
 							.getEndpoints();
 					ExposableWebEndpoint endpoint = endpoints.stream()
-							.filter((candidate) -> "test".equals(candidate.getId()))
+							.filter((candidate) -> EndpointId.of("test")
+									.equals(candidate.getEndpointId()))
 							.findFirst().get();
 					assertThat(endpoint.getOperations()).hasSize(1);
 					WebOperation operation = endpoint.getOperations().iterator().next();

spring-boot-project/spring-boot-actuator-autoconfigure/src/test/java/org/springframework/boot/actuate/autoconfigure/cloudfoundry/servlet/CloudFoundryActuatorAutoConfigurationTests.java

@@ -26,6 +26,7 @@ import org.springframework.boot.actuate.autoconfigure.endpoint.web.WebEndpointAu
 import org.springframework.boot.actuate.autoconfigure.health.HealthEndpointAutoConfiguration;
 import org.springframework.boot.actuate.autoconfigure.web.server.ManagementContextAutoConfiguration;
 import org.springframework.boot.actuate.autoconfigure.web.servlet.ServletManagementContextAutoConfiguration;
+import org.springframework.boot.actuate.endpoint.EndpointId;
 import org.springframework.boot.actuate.endpoint.annotation.Endpoint;
 import org.springframework.boot.actuate.endpoint.annotation.ReadOperation;
 import org.springframework.boot.actuate.endpoint.http.ActuatorMediaType;
@@ -235,7 +236,8 @@ public class CloudFoundryActuatorAutoConfigurationTests {
 					Collection<ExposableWebEndpoint> endpoints = handlerMapping
 							.getEndpoints();
 					assertThat(endpoints.stream()
-							.filter((candidate) -> "test".equals(candidate.getId()))
+							.filter((candidate) -> EndpointId.of("test")
+									.equals(candidate.getEndpointId()))
 							.findFirst()).isNotEmpty();
 				});
 	}
@@ -253,7 +255,8 @@ public class CloudFoundryActuatorAutoConfigurationTests {
 					Collection<ExposableWebEndpoint> endpoints = handlerMapping
 							.getEndpoints();
 					ExposableWebEndpoint endpoint = endpoints.stream()
-							.filter((candidate) -> "test".equals(candidate.getId()))
+							.filter((candidate) -> EndpointId.of("test")
+									.equals(candidate.getEndpointId()))
 							.findFirst().get();
 					Collection<WebOperation> operations = endpoint.getOperations();
 					assertThat(operations).hasSize(1);

spring-boot-project/spring-boot-actuator-autoconfigure/src/test/java/org/springframework/boot/actuate/autoconfigure/cloudfoundry/servlet/CloudFoundrySecurityInterceptorTests.java

 /*
- * Copyright 2012-2017 the original author or authors.
+ * Copyright 2012-2018 the original author or authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -26,6 +26,7 @@ import org.springframework.boot.actuate.autoconfigure.cloudfoundry.AccessLevel;
 import org.springframework.boot.actuate.autoconfigure.cloudfoundry.CloudFoundryAuthorizationException.Reason;
 import org.springframework.boot.actuate.autoconfigure.cloudfoundry.SecurityResponse;
 import org.springframework.boot.actuate.autoconfigure.cloudfoundry.Token;
+import org.springframework.boot.actuate.endpoint.EndpointId;
 import org.springframework.http.HttpHeaders;
 import org.springframework.http.HttpStatus;
 import org.springframework.mock.web.MockHttpServletRequest;
@@ -65,13 +66,15 @@ public class CloudFoundrySecurityInterceptorTests {
 		this.request.setMethod("OPTIONS");
 		this.request.addHeader(HttpHeaders.ORIGIN, "http://example.com");
 		this.request.addHeader(HttpHeaders.ACCESS_CONTROL_REQUEST_METHOD, "GET");
-		SecurityResponse response = this.interceptor.preHandle(this.request, "/a");
+		SecurityResponse response = this.interceptor.preHandle(this.request,
+				EndpointId.of("test"));
 		assertThat(response.getStatus()).isEqualTo(HttpStatus.OK);
 	}
 
 	@Test
 	public void preHandleWhenTokenIsMissingShouldReturnFalse() {
-		SecurityResponse response = this.interceptor.preHandle(this.request, "/a");
+		SecurityResponse response = this.interceptor.preHandle(this.request,
+				EndpointId.of("test"));
 		assertThat(response.getStatus())
 				.isEqualTo(Reason.MISSING_AUTHORIZATION.getStatus());
 	}
@@ -79,7 +82,8 @@ public class CloudFoundrySecurityInterceptorTests {
 	@Test
 	public void preHandleWhenTokenIsNotBearerShouldReturnFalse() {
 		this.request.addHeader("Authorization", mockAccessToken());
-		SecurityResponse response = this.interceptor.preHandle(this.request, "/a");
+		SecurityResponse response = this.interceptor.preHandle(this.request,
+				EndpointId.of("test"));
 		assertThat(response.getStatus())
 				.isEqualTo(Reason.MISSING_AUTHORIZATION.getStatus());
 	}
@@ -89,7 +93,8 @@ public class CloudFoundrySecurityInterceptorTests {
 		this.interceptor = new CloudFoundrySecurityInterceptor(this.tokenValidator,
 				this.securityService, null);
 		this.request.addHeader("Authorization", "bearer " + mockAccessToken());
-		SecurityResponse response = this.interceptor.preHandle(this.request, "/a");
+		SecurityResponse response = this.interceptor.preHandle(this.request,
+				EndpointId.of("test"));
 		assertThat(response.getStatus())
 				.isEqualTo(Reason.SERVICE_UNAVAILABLE.getStatus());
 	}
@@ -99,7 +104,8 @@ public class CloudFoundrySecurityInterceptorTests {
 		this.interceptor = new CloudFoundrySecurityInterceptor(this.tokenValidator, null,
 				"my-app-id");
 		this.request.addHeader("Authorization", "bearer " + mockAccessToken());
-		SecurityResponse response = this.interceptor.preHandle(this.request, "/a");
+		SecurityResponse response = this.interceptor.preHandle(this.request,
+				EndpointId.of("test"));
 		assertThat(response.getStatus())
 				.isEqualTo(Reason.SERVICE_UNAVAILABLE.getStatus());
 	}
@@ -110,7 +116,8 @@ public class CloudFoundrySecurityInterceptorTests {
 		this.request.addHeader("Authorization", "bearer " + accessToken);
 		given(this.securityService.getAccessLevel(accessToken, "my-app-id"))
 				.willReturn(AccessLevel.RESTRICTED);
-		SecurityResponse response = this.interceptor.preHandle(this.request, "/a");
+		SecurityResponse response = this.interceptor.preHandle(this.request,
+				EndpointId.of("test"));
 		assertThat(response.getStatus()).isEqualTo(Reason.ACCESS_DENIED.getStatus());
 	}
 
@@ -120,7 +127,8 @@ public class CloudFoundrySecurityInterceptorTests {
 		this.request.addHeader("Authorization", "Bearer " + accessToken);
 		given(this.securityService.getAccessLevel(accessToken, "my-app-id"))
 				.willReturn(AccessLevel.FULL);
-		SecurityResponse response = this.interceptor.preHandle(this.request, "/a");
+		SecurityResponse response = this.interceptor.preHandle(this.request,
+				EndpointId.of("test"));
 		ArgumentCaptor<Token> tokenArgumentCaptor = ArgumentCaptor.forClass(Token.class);
 		verify(this.tokenValidator).validate(tokenArgumentCaptor.capture());
 		Token token = tokenArgumentCaptor.getValue();
@@ -136,7 +144,8 @@ public class CloudFoundrySecurityInterceptorTests {
 		this.request.addHeader("Authorization", "Bearer " + accessToken);
 		given(this.securityService.getAccessLevel(accessToken, "my-app-id"))
 				.willReturn(AccessLevel.RESTRICTED);
-		SecurityResponse response = this.interceptor.preHandle(this.request, "info");
+		SecurityResponse response = this.interceptor.preHandle(this.request,
+				EndpointId.of("info"));
 		ArgumentCaptor<Token> tokenArgumentCaptor = ArgumentCaptor.forClass(Token.class);
 		verify(this.tokenValidator).validate(tokenArgumentCaptor.capture());
 		Token token = tokenArgumentCaptor.getValue();

spring-boot-project/spring-boot-actuator-autoconfigure/src/test/java/org/springframework/boot/actuate/autoconfigure/endpoint/ExposeExcludePropertyEndpointFilterTests.java

@@ -23,6 +23,7 @@ import org.junit.rules.ExpectedException;
 import org.mockito.MockitoAnnotations;
 
 import org.springframework.boot.actuate.endpoint.EndpointFilter;
+import org.springframework.boot.actuate.endpoint.EndpointId;
 import org.springframework.boot.actuate.endpoint.ExposableEndpoint;
 import org.springframework.boot.actuate.endpoint.web.ExposableWebEndpoint;
 import org.springframework.mock.env.MockEnvironment;
@@ -81,43 +82,43 @@ public class ExposeExcludePropertyEndpointFilterTests {
 	@Test
 	public void matchWhenExposeIsEmptyAndExcludeIsEmptyAndInDefaultShouldMatch() {
 		setupFilter("", "");
-		assertThat(match("def")).isTrue();
+		assertThat(match(EndpointId.of("def"))).isTrue();
 	}
 
 	@Test
 	public void matchWhenExposeIsEmptyAndExcludeIsEmptyAndNotInDefaultShouldNotMatch() {
 		setupFilter("", "");
-		assertThat(match("bar")).isFalse();
+		assertThat(match(EndpointId.of("bar"))).isFalse();
 	}
 
 	@Test
 	public void matchWhenExposeMatchesAndExcludeIsEmptyShouldMatch() {
 		setupFilter("bar", "");
-		assertThat(match("bar")).isTrue();
+		assertThat(match(EndpointId.of("bar"))).isTrue();
 	}
 
 	@Test
 	public void matchWhenExposeDoesNotMatchAndExcludeIsEmptyShouldNotMatch() {
 		setupFilter("bar", "");
-		assertThat(match("baz")).isFalse();
+		assertThat(match(EndpointId.of("baz"))).isFalse();
 	}
 
 	@Test
 	public void matchWhenExposeMatchesAndExcludeMatchesShouldNotMatch() {
 		setupFilter("bar,baz", "baz");
-		assertThat(match("baz")).isFalse();
+		assertThat(match(EndpointId.of("baz"))).isFalse();
 	}
 
 	@Test
 	public void matchWhenExposeMatchesAndExcludeDoesNotMatchShouldMatch() {
 		setupFilter("bar,baz", "buz");
-		assertThat(match("baz")).isTrue();
+		assertThat(match(EndpointId.of("baz"))).isTrue();
 	}
 
 	@Test
 	public void matchWhenExposeMatchesWithDifferentCaseShouldMatch() {
 		setupFilter("bar", "");
-		assertThat(match("bAr")).isTrue();
+		assertThat(match(EndpointId.of("bAr"))).isTrue();
 	}
 
 	@Test
@@ -127,23 +128,23 @@ public class ExposeExcludePropertyEndpointFilterTests {
 		environment.setProperty("foo.exclude", "");
 		this.filter = new ExposeExcludePropertyEndpointFilter<>(
 				DifferentTestExposableWebEndpoint.class, environment, "foo");
-		assertThat(match("baz")).isTrue();
+		assertThat(match(EndpointId.of("baz"))).isTrue();
 	}
 
 	@Test
 	public void matchWhenIncludeIsAsteriskShouldMatchAll() {
 		setupFilter("*", "buz");
-		assertThat(match("bar")).isTrue();
-		assertThat(match("baz")).isTrue();
-		assertThat(match("buz")).isFalse();
+		assertThat(match(EndpointId.of("bar"))).isTrue();
+		assertThat(match(EndpointId.of("baz"))).isTrue();
+		assertThat(match(EndpointId.of("buz"))).isFalse();
 	}
 
 	@Test
 	public void matchWhenExcludeIsAsteriskShouldMatchNone() {
 		setupFilter("bar,baz,buz", "*");
-		assertThat(match("bar")).isFalse();
-		assertThat(match("baz")).isFalse();
-		assertThat(match("buz")).isFalse();
+		assertThat(match(EndpointId.of("bar"))).isFalse();
+		assertThat(match(EndpointId.of("baz"))).isFalse();
+		assertThat(match(EndpointId.of("buz"))).isFalse();
 	}
 
 	private void setupFilter(String include, String exclude) {
@@ -155,9 +156,9 @@ public class ExposeExcludePropertyEndpointFilterTests {
 	}
 
 	@SuppressWarnings({ "rawtypes", "unchecked" })
-	private boolean match(String id) {
+	private boolean match(EndpointId id) {
 		ExposableEndpoint<?> endpoint = mock(TestExposableWebEndpoint.class);
-		given(endpoint.getId()).willReturn(id);
+		given(endpoint.getEndpointId()).willReturn(id);
 		return ((EndpointFilter) this.filter).match(endpoint);
 	}
 

spring-boot-project/spring-boot-actuator-autoconfigure/src/test/java/org/springframework/boot/actuate/autoconfigure/endpoint/jmx/DefaultEndpointObjectNameFactoryTests.java

@@ -24,6 +24,7 @@ import javax.management.ObjectName;
 
 import org.junit.Test;
 
+import org.springframework.boot.actuate.endpoint.EndpointId;
 import org.springframework.boot.actuate.endpoint.jmx.ExposableJmxEndpoint;
 import org.springframework.mock.env.MockEnvironment;
 import org.springframework.util.ObjectUtils;
@@ -50,22 +51,23 @@ public class DefaultEndpointObjectNameFactoryTests {
 
 	@Test
 	public void generateObjectName() {
-		ObjectName objectName = generateObjectName(endpoint("Test"));
+		ObjectName objectName = generateObjectName(endpoint(EndpointId.of("test")));
 		assertThat(objectName.toString())
 				.isEqualTo("org.springframework.boot:type=Endpoint,name=Test");
 	}
 
 	@Test
 	public void generateObjectNameWithCapitalizedId() {
-		ObjectName objectName = generateObjectName(endpoint("test"));
+		ObjectName objectName = generateObjectName(
+				endpoint(EndpointId.of("testEndpoint")));
 		assertThat(objectName.toString())
-				.isEqualTo("org.springframework.boot:type=Endpoint,name=Test");
+				.isEqualTo("org.springframework.boot:type=Endpoint,name=TestEndpoint");
 	}
 
 	@Test
 	public void generateObjectNameWithCustomDomain() {
 		this.properties.setDomain("com.example.acme");
-		ObjectName objectName = generateObjectName(endpoint("test"));
+		ObjectName objectName = generateObjectName(endpoint(EndpointId.of("test")));
 		assertThat(objectName.toString())
 				.isEqualTo("com.example.acme:type=Endpoint,name=Test");
 	}
@@ -73,7 +75,7 @@ public class DefaultEndpointObjectNameFactoryTests {
 	@Test
 	public void generateObjectNameWithUniqueNames() {
 		this.properties.setUniqueNames(true);
-		ExposableJmxEndpoint endpoint = endpoint("test");
+		ExposableJmxEndpoint endpoint = endpoint(EndpointId.of("test"));
 		String id = ObjectUtils.getIdentityHexString(endpoint);
 		ObjectName objectName = generateObjectName(endpoint);
 		assertThat(objectName.toString()).isEqualTo(
@@ -84,7 +86,7 @@ public class DefaultEndpointObjectNameFactoryTests {
 	public void generateObjectNameWithStaticNames() {
 		this.properties.getStaticNames().setProperty("counter", "42");
 		this.properties.getStaticNames().setProperty("foo", "bar");
-		ObjectName objectName = generateObjectName(endpoint("test"));
+		ObjectName objectName = generateObjectName(endpoint(EndpointId.of("test")));
 		assertThat(objectName.getKeyProperty("counter")).isEqualTo("42");
 		assertThat(objectName.getKeyProperty("foo")).isEqualTo("bar");
 		assertThat(objectName.toString())
@@ -99,7 +101,7 @@ public class DefaultEndpointObjectNameFactoryTests {
 				null)).willReturn(
 						Collections.singleton(new ObjectName(
 								"org.springframework.boot:type=Endpoint,name=Test")));
-		ObjectName objectName = generateObjectName(endpoint("test"));
+		ObjectName objectName = generateObjectName(endpoint(EndpointId.of("test")));
 		assertThat(objectName.toString()).isEqualTo(
 				"org.springframework.boot:type=Endpoint,name=Test,context=testContext");
 
@@ -115,9 +117,9 @@ public class DefaultEndpointObjectNameFactoryTests {
 		}
 	}
 
-	private ExposableJmxEndpoint endpoint(String id) {
+	private ExposableJmxEndpoint endpoint(EndpointId id) {
 		ExposableJmxEndpoint endpoint = mock(ExposableJmxEndpoint.class);
-		given(endpoint.getId()).willReturn(id);
+		given(endpoint.getEndpointId()).willReturn(id);
 		return endpoint;
 	}
 

spring-boot-project/spring-boot-actuator-autoconfigure/src/test/java/org/springframework/boot/actuate/autoconfigure/endpoint/web/MappingWebEndpointPathMapperTests.java

@@ -20,6 +20,8 @@ import java.util.Collections;
 
 import org.junit.Test;
 
+import org.springframework.boot.actuate.endpoint.EndpointId;
+
 import static org.assertj.core.api.Assertions.assertThat;
 
 /**
@@ -33,14 +35,14 @@ public class MappingWebEndpointPathMapperTests {
 	public void defaultConfiguration() {
 		MappingWebEndpointPathMapper mapper = new MappingWebEndpointPathMapper(
 				Collections.emptyMap());
-		assertThat(mapper.getRootPath("test")).isEqualTo("test");
+		assertThat(mapper.getRootPath(EndpointId.of("test"))).isEqualTo("test");
 	}
 
 	@Test
 	public void userConfiguration() {
 		MappingWebEndpointPathMapper mapper = new MappingWebEndpointPathMapper(
 				Collections.singletonMap("test", "custom"));
-		assertThat(mapper.getRootPath("test")).isEqualTo("custom");
+		assertThat(mapper.getRootPath(EndpointId.of("test"))).isEqualTo("custom");
 	}
 
 }

spring-boot-project/spring-boot-actuator-autoconfigure/src/test/java/org/springframework/boot/actuate/autoconfigure/endpoint/web/WebEndpointAutoConfigurationTests.java

@@ -20,6 +20,7 @@ import org.junit.Test;
 
 import org.springframework.boot.actuate.autoconfigure.endpoint.EndpointAutoConfiguration;
 import org.springframework.boot.actuate.autoconfigure.endpoint.ExposeExcludePropertyEndpointFilter;
+import org.springframework.boot.actuate.endpoint.EndpointId;
 import org.springframework.boot.actuate.endpoint.http.ActuatorMediaType;
 import org.springframework.boot.actuate.endpoint.web.EndpointMediaTypes;
 import org.springframework.boot.actuate.endpoint.web.PathMapper;
@@ -65,7 +66,7 @@ public class WebEndpointAutoConfigurationTests {
 				.run((context) -> {
 					assertThat(context).hasSingleBean(PathMapper.class);
 					String pathMapping = context.getBean(PathMapper.class)
-							.getRootPath("health");
+							.getRootPath(EndpointId.of("health"));
 					assertThat(pathMapping).isEqualTo("healthcheck");
 				});
 	}

spring-boot-project/spring-boot-actuator-autoconfigure/src/test/java/org/springframework/boot/actuate/autoconfigure/security/reactive/EndpointRequestTests.java

@@ -23,6 +23,7 @@ import org.assertj.core.api.AssertDelegateTarget;
 import org.junit.Test;
 
 import org.springframework.boot.actuate.autoconfigure.endpoint.web.WebEndpointProperties;
+import org.springframework.boot.actuate.endpoint.EndpointId;
 import org.springframework.boot.actuate.endpoint.ExposableEndpoint;
 import org.springframework.boot.actuate.endpoint.Operation;
 import org.springframework.boot.actuate.endpoint.annotation.Endpoint;
@@ -129,9 +130,9 @@ public class EndpointRequestTests {
 		ServerWebExchangeMatcher matcher = EndpointRequest.toAnyEndpoint()
 				.excluding(FooEndpoint.class, BazServletEndpoint.class);
 		List<ExposableEndpoint<?>> endpoints = new ArrayList<>();
-		endpoints.add(mockEndpoint("foo", "foo"));
-		endpoints.add(mockEndpoint("bar", "bar"));
-		endpoints.add(mockEndpoint("baz", "baz"));
+		endpoints.add(mockEndpoint(EndpointId.of("foo"), "foo"));
+		endpoints.add(mockEndpoint(EndpointId.of("bar"), "bar"));
+		endpoints.add(mockEndpoint(EndpointId.of("baz"), "baz"));
 		PathMappedEndpoints pathMappedEndpoints = new PathMappedEndpoints("/actuator",
 				() -> endpoints);
 		assertMatcher(matcher, pathMappedEndpoints).doesNotMatch("/actuator/foo");
@@ -202,14 +203,14 @@ public class EndpointRequestTests {
 
 	private PathMappedEndpoints mockPathMappedEndpoints(String basePath) {
 		List<ExposableEndpoint<?>> endpoints = new ArrayList<>();
-		endpoints.add(mockEndpoint("foo", "foo"));
-		endpoints.add(mockEndpoint("bar", "bar"));
+		endpoints.add(mockEndpoint(EndpointId.of("foo"), "foo"));
+		endpoints.add(mockEndpoint(EndpointId.of("bar"), "bar"));
 		return new PathMappedEndpoints(basePath, () -> endpoints);
 	}
 
-	private TestEndpoint mockEndpoint(String id, String rootPath) {
+	private TestEndpoint mockEndpoint(EndpointId id, String rootPath) {
 		TestEndpoint endpoint = mock(TestEndpoint.class);
-		given(endpoint.getId()).willReturn(id);
+		given(endpoint.getEndpointId()).willReturn(id);
 		given(endpoint.getRootPath()).willReturn(rootPath);
 		return endpoint;
 	}

spring-boot-project/spring-boot-actuator-autoconfigure/src/test/java/org/springframework/boot/actuate/autoconfigure/security/servlet/EndpointRequestTests.java

@@ -25,6 +25,7 @@ import org.assertj.core.api.AssertDelegateTarget;
 import org.junit.Test;
 
 import org.springframework.boot.actuate.autoconfigure.endpoint.web.WebEndpointProperties;
+import org.springframework.boot.actuate.endpoint.EndpointId;
 import org.springframework.boot.actuate.endpoint.ExposableEndpoint;
 import org.springframework.boot.actuate.endpoint.Operation;
 import org.springframework.boot.actuate.endpoint.annotation.Endpoint;
@@ -163,9 +164,9 @@ public class EndpointRequestTests {
 		RequestMatcher matcher = EndpointRequest.toAnyEndpoint()
 				.excluding(FooEndpoint.class, BazServletEndpoint.class);
 		List<ExposableEndpoint<?>> endpoints = new ArrayList<>();
-		endpoints.add(mockEndpoint("foo", "foo"));
-		endpoints.add(mockEndpoint("bar", "bar"));
-		endpoints.add(mockEndpoint("baz", "baz"));
+		endpoints.add(mockEndpoint(EndpointId.of("foo"), "foo"));
+		endpoints.add(mockEndpoint(EndpointId.of("bar"), "bar"));
+		endpoints.add(mockEndpoint(EndpointId.of("baz"), "baz"));
 		PathMappedEndpoints pathMappedEndpoints = new PathMappedEndpoints("/actuator",
 				() -> endpoints);
 		assertMatcher(matcher, pathMappedEndpoints).doesNotMatch("/actuator/foo");
@@ -258,14 +259,14 @@ public class EndpointRequestTests {
 
 	private PathMappedEndpoints mockPathMappedEndpoints(String basePath) {
 		List<ExposableEndpoint<?>> endpoints = new ArrayList<>();
-		endpoints.add(mockEndpoint("foo", "foo"));
-		endpoints.add(mockEndpoint("bar", "bar"));
+		endpoints.add(mockEndpoint(EndpointId.of("foo"), "foo"));
+		endpoints.add(mockEndpoint(EndpointId.of("bar"), "bar"));
 		return new PathMappedEndpoints(basePath, () -> endpoints);
 	}
 
-	private TestEndpoint mockEndpoint(String id, String rootPath) {
+	private TestEndpoint mockEndpoint(EndpointId id, String rootPath) {
 		TestEndpoint endpoint = mock(TestEndpoint.class);
-		given(endpoint.getId()).willReturn(id);
+		given(endpoint.getEndpointId()).willReturn(id);
 		given(endpoint.getRootPath()).willReturn(rootPath);
 		return endpoint;
 	}

spring-boot-project/spring-boot-actuator/src/main/java/org/springframework/boot/actuate/endpoint/AbstractExposableEndpoint.java

@@ -33,7 +33,7 @@ import org.springframework.util.Assert;
 public abstract class AbstractExposableEndpoint<O extends Operation>
 		implements ExposableEndpoint<O> {
 
-	private final String id;
+	private final EndpointId id;
 
 	private boolean enabledByDefault;
 
@@ -44,9 +44,24 @@ public abstract class AbstractExposableEndpoint<O extends Operation>
 	 * @param id the endpoint id
 	 * @param enabledByDefault if the endpoint is enabled by default
 	 * @param operations the endpoint operations
+	 * @deprecated since 2.0.6 in favor of
+	 * {@link #AbstractExposableEndpoint(EndpointId, boolean, Collection)}
 	 */
+	@Deprecated
 	public AbstractExposableEndpoint(String id, boolean enabledByDefault,
 			Collection<? extends O> operations) {
+		this(EndpointId.of(id), enabledByDefault, operations);
+	}
+
+	/**
+	 * Create a new {@link AbstractExposableEndpoint} instance.
+	 * @param id the endpoint id
+	 * @param enabledByDefault if the endpoint is enabled by default
+	 * @param operations the endpoint operations
+	 * @since 2.0.6
+	 */
+	public AbstractExposableEndpoint(EndpointId id, boolean enabledByDefault,
+			Collection<? extends O> operations) {
 		Assert.notNull(id, "ID must not be null");
 		Assert.notNull(operations, "Operations must not be null");
 		this.id = id;
@@ -56,7 +71,7 @@ public abstract class AbstractExposableEndpoint<O extends Operation>
 
 	@Override
 	public String getId() {
-		return this.id;
+		return this.id.toString();
 	}
 
 	@Override

spring-boot-project/spring-boot-actuator/src/main/java/org/springframework/boot/actuate/endpoint/EndpointId.java

+/*
+ * Copyright 2012-2018 the original author or authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.springframework.boot.actuate.endpoint;
+
+import java.util.Locale;
+import java.util.regex.Pattern;
+
+import org.springframework.util.Assert;
+
+/**
+ * An identifier for an actuator endpoint. Endpoint IDs may contain only letters and
+ * numbers and must begin with a lower-case letter. Case is ignored when comparing
+ * endpoint IDs.
+ *
+ * @author Phillip Webb
+ * @since 2.0.6
+ */
+public final class EndpointId {
+
+	private static final Pattern ALPHA_NUMERIC = Pattern.compile("[a-zA-Z0-9]+");
+
+	private final String value;
+
+	private final String lowerCaseValue;
+
+	private EndpointId(String value) {
+		Assert.hasText(value, "Value must not be empty");
+		Assert.isTrue(ALPHA_NUMERIC.matcher(value).matches(),
+				"Value must be alpha-numeric");
+		Assert.isTrue(!Character.isDigit(value.charAt(0)),
+				"Value must not start with a number");
+		Assert.isTrue(!Character.isUpperCase(value.charAt(0)),
+				"Value must not start with an uppercase letter");
+		this.value = value;
+		this.lowerCaseValue = value.toLowerCase(Locale.ENGLISH);
+	}
+
+	@Override
+	public boolean equals(Object obj) {
+		if (this == obj) {
+			return true;
+		}
+		if (obj == null || getClass() != obj.getClass()) {
+			return false;
+		}
+		return toLowerCaseString().equals(((EndpointId) obj).toLowerCaseString());
+	}
+
+	@Override
+	public int hashCode() {
+		return toLowerCaseString().hashCode();
+	}
+
+	/**
+	 * Return a lower-case version of the endpoint ID.
+	 * @return the lower-case endpoint ID
+	 */
+	public String toLowerCaseString() {
+		return this.lowerCaseValue;
+	}
+
+	@Override
+	public String toString() {
+		return this.value;
+	}
+
+	/**
+	 * Factory method to create a new {@link EndpointId} of the specified value.
+	 * @param value the endpoint ID value
+	 * @return an {@link EndpointId} instance
+	 */
+	public static EndpointId of(String value) {
+		return new EndpointId(value);
+	}
+
+}

spring-boot-project/spring-boot-actuator/src/main/java/org/springframework/boot/actuate/endpoint/ExposableEndpoint.java

@@ -31,9 +31,20 @@ public interface ExposableEndpoint<O extends Operation> {
 	/**
 	 * Returns the id of the endpoint.
 	 * @return the id
+	 * @deprecated since 2.0.6 in favor of {@link #getEndpointId()}
 	 */
+	@Deprecated
 	String getId();
 
+	/**
+	 * Return the endpoint ID.
+	 * @return the endpoint ID
+	 * @since 2.0.6
+	 */
+	default EndpointId getEndpointId() {
+		return EndpointId.of(getId());
+	}
+
 	/**
 	 * Returns if the endpoint is enabled by default.
 	 * @return if the endpoint is enabled by default

spring-boot-project/spring-boot-actuator/src/main/java/org/springframework/boot/actuate/endpoint/annotation/AbstractDiscoveredEndpoint.java

@@ -19,6 +19,7 @@ package org.springframework.boot.actuate.endpoint.annotation;
 import java.util.Collection;
 
 import org.springframework.boot.actuate.endpoint.AbstractExposableEndpoint;
+import org.springframework.boot.actuate.endpoint.EndpointId;
 import org.springframework.boot.actuate.endpoint.ExposableEndpoint;
 import org.springframework.boot.actuate.endpoint.Operation;
 import org.springframework.core.style.ToStringCreator;
@@ -46,10 +47,28 @@ public abstract class AbstractDiscoveredEndpoint<O extends Operation>
 	 * @param id the ID of the endpoint
 	 * @param enabledByDefault if the endpoint is enabled by default
 	 * @param operations the endpoint operations
+	 * @deprecated since 2.0.6 in favor of
+	 * {@link #AbstractDiscoveredEndpoint(EndpointDiscoverer, Object, EndpointId, boolean, Collection)}
 	 */
+	@Deprecated
 	public AbstractDiscoveredEndpoint(EndpointDiscoverer<?, ?> discoverer,
 			Object endpointBean, String id, boolean enabledByDefault,
 			Collection<? extends O> operations) {
+		this(discoverer, endpointBean, EndpointId.of(id), enabledByDefault, operations);
+	}
+
+	/**
+	 * Create a new {@link AbstractDiscoveredEndpoint} instance.
+	 * @param discoverer the discoverer that discovered the endpoint
+	 * @param endpointBean the primary source bean
+	 * @param id the ID of the endpoint
+	 * @param enabledByDefault if the endpoint is enabled by default
+	 * @param operations the endpoint operations
+	 * @since 2.0.6
+	 */
+	public AbstractDiscoveredEndpoint(EndpointDiscoverer<?, ?> discoverer,
+			Object endpointBean, EndpointId id, boolean enabledByDefault,
+			Collection<? extends O> operations) {
 		super(id, enabledByDefault, operations);
 		Assert.notNull(discoverer, "Discoverer must not be null");
 		Assert.notNull(endpointBean, "EndpointBean must not be null");

spring-boot-project/spring-boot-actuator/src/main/java/org/springframework/boot/actuate/endpoint/annotation/DiscoveredOperationsFactory.java

@@ -24,6 +24,7 @@ import java.util.EnumMap;
 import java.util.Map;
 import java.util.Objects;
 
+import org.springframework.boot.actuate.endpoint.EndpointId;
 import org.springframework.boot.actuate.endpoint.Operation;
 import org.springframework.boot.actuate.endpoint.OperationType;
 import org.springframework.boot.actuate.endpoint.invoke.OperationInvoker;
@@ -68,20 +69,20 @@ abstract class DiscoveredOperationsFactory<O extends Operation> {
 		this.invokerAdvisors = invokerAdvisors;
 	}
 
-	public Collection<O> createOperations(String id, Object target) {
+	public Collection<O> createOperations(EndpointId id, Object target) {
 		return MethodIntrospector.selectMethods(target.getClass(),
 				(MetadataLookup<O>) (method) -> createOperation(id, target, method))
 				.values();
 	}
 
-	private O createOperation(String endpointId, Object target, Method method) {
+	private O createOperation(EndpointId endpointId, Object target, Method method) {
 		return OPERATION_TYPES.entrySet().stream()
 				.map((entry) -> createOperation(endpointId, target, method,
 						entry.getKey(), entry.getValue()))
 				.filter(Objects::nonNull).findFirst().orElse(null);
 	}
 
-	private O createOperation(String endpointId, Object target, Method method,
+	private O createOperation(EndpointId endpointId, Object target, Method method,
 			OperationType operationType, Class<? extends Annotation> annotationType) {
 		AnnotationAttributes annotationAttributes = AnnotatedElementUtils
 				.getMergedAnnotationAttributes(method, annotationType);
@@ -96,7 +97,7 @@ abstract class DiscoveredOperationsFactory<O extends Operation> {
 		return createOperation(endpointId, operationMethod, invoker);
 	}
 
-	private OperationInvoker applyAdvisors(String endpointId,
+	private OperationInvoker applyAdvisors(EndpointId endpointId,
 			OperationMethod operationMethod, OperationInvoker invoker) {
 		if (this.invokerAdvisors != null) {
 			for (OperationInvokerAdvisor advisor : this.invokerAdvisors) {
@@ -107,7 +108,7 @@ abstract class DiscoveredOperationsFactory<O extends Operation> {
 		return invoker;
 	}
 
-	protected abstract O createOperation(String endpointId,
+	protected abstract O createOperation(EndpointId endpointId,
 			DiscoveredOperationMethod operationMethod, OperationInvoker invoker);
 
 }

spring-boot-project/spring-boot-actuator/src/main/java/org/springframework/boot/actuate/endpoint/annotation/Endpoint.java

@@ -22,6 +22,8 @@ import java.lang.annotation.Retention;
 import java.lang.annotation.RetentionPolicy;
 import java.lang.annotation.Target;
 
+import org.springframework.boot.actuate.endpoint.EndpointId;
+
 /**
  * Identifies a type as being an actuator endpoint that provides information about the
  * running application. Endpoints can be exposed over a variety of technologies including
@@ -52,8 +54,9 @@ import java.lang.annotation.Target;
 public @interface Endpoint {
 
 	/**
-	 * The id of the endpoint.
+	 * The id of the endpoint (must follow {@link EndpointId} rules).
 	 * @return the id
+	 * @see EndpointId
 	 */
 	String id() default "";
 

spring-boot-project/spring-boot-actuator/src/main/java/org/springframework/boot/actuate/endpoint/annotation/EndpointDiscoverer.java

@@ -32,6 +32,7 @@ import java.util.stream.Collectors;
 import org.springframework.beans.BeanUtils;
 import org.springframework.beans.factory.BeanFactoryUtils;
 import org.springframework.boot.actuate.endpoint.EndpointFilter;
+import org.springframework.boot.actuate.endpoint.EndpointId;
 import org.springframework.boot.actuate.endpoint.EndpointsSupplier;
 import org.springframework.boot.actuate.endpoint.ExposableEndpoint;
 import org.springframework.boot.actuate.endpoint.Operation;
@@ -101,7 +102,7 @@ public abstract class EndpointDiscoverer<E extends ExposableEndpoint<O>, O exten
 		return new DiscoveredOperationsFactory<O>(parameterValueMapper, invokerAdvisors) {
 
 			@Override
-			protected O createOperation(String endpointId,
+			protected O createOperation(EndpointId endpointId,
 					DiscoveredOperationMethod operationMethod, OperationInvoker invoker) {
 				return EndpointDiscoverer.this.createOperation(endpointId,
 						operationMethod, invoker);
@@ -125,7 +126,7 @@ public abstract class EndpointDiscoverer<E extends ExposableEndpoint<O>, O exten
 	}
 
 	private Collection<EndpointBean> createEndpointBeans() {
-		Map<String, EndpointBean> byId = new LinkedHashMap<>();
+		Map<EndpointId, EndpointBean> byId = new LinkedHashMap<>();
 		String[] beanNames = BeanFactoryUtils.beanNamesForAnnotationIncludingAncestors(
 				this.applicationContext, Endpoint.class);
 		for (String beanName : beanNames) {
@@ -145,7 +146,7 @@ public abstract class EndpointDiscoverer<E extends ExposableEndpoint<O>, O exten
 	}
 
 	private void addExtensionBeans(Collection<EndpointBean> endpointBeans) {
-		Map<String, EndpointBean> byId = endpointBeans.stream()
+		Map<EndpointId, EndpointBean> byId = endpointBeans.stream()
 				.collect(Collectors.toMap(EndpointBean::getId, (bean) -> bean));
 		String[] beanNames = BeanFactoryUtils.beanNamesForAnnotationIncludingAncestors(
 				this.applicationContext, EndpointExtension.class);
@@ -189,7 +190,7 @@ public abstract class EndpointDiscoverer<E extends ExposableEndpoint<O>, O exten
 
 	private E convertToEndpoint(EndpointBean endpointBean) {
 		MultiValueMap<OperationKey, O> indexed = new LinkedMultiValueMap<>();
-		String id = endpointBean.getId();
+		EndpointId id = endpointBean.getId();
 		addOperations(indexed, id, endpointBean.getBean(), false);
 		if (endpointBean.getExtensions().size() > 1) {
 			String extensionBeans = endpointBean.getExtensions().stream()
@@ -209,7 +210,7 @@ public abstract class EndpointDiscoverer<E extends ExposableEndpoint<O>, O exten
 				endpointBean.isEnabledByDefault(), operations);
 	}
 
-	private void addOperations(MultiValueMap<OperationKey, O> indexed, String id,
+	private void addOperations(MultiValueMap<OperationKey, O> indexed, EndpointId id,
 			Object target, boolean replaceLast) {
 		Set<OperationKey> replacedLast = new HashSet<>();
 		Collection<O> operations = this.operationsFactory.createOperations(id, target);
@@ -339,7 +340,25 @@ public abstract class EndpointDiscoverer<E extends ExposableEndpoint<O>, O exten
 	 * @param enabledByDefault if the endpoint is enabled by default
 	 * @param operations the endpoint operations
 	 * @return a created endpoint (a {@link DiscoveredEndpoint} is recommended)
+	 * @since 2.0.6
 	 */
+	protected E createEndpoint(Object endpointBean, EndpointId id,
+			boolean enabledByDefault, Collection<O> operations) {
+		return createEndpoint(endpointBean, (id != null) ? id.toString() : null,
+				enabledByDefault, operations);
+	}
+
+	/**
+	 * Factory method called to create the {@link ExposableEndpoint endpoint}.
+	 * @param endpointBean the source endpoint bean
+	 * @param id the ID of the endpoint
+	 * @param enabledByDefault if the endpoint is enabled by default
+	 * @param operations the endpoint operations
+	 * @return a created endpoint (a {@link DiscoveredEndpoint} is recommended)
+	 * @deprecated Since 2.0.6 in favor of
+	 * {@link #createEndpoint(Object, EndpointId, boolean, Collection)}
+	 */
+	@Deprecated
 	protected abstract E createEndpoint(Object endpointBean, String id,
 			boolean enabledByDefault, Collection<O> operations);
 
@@ -349,7 +368,24 @@ public abstract class EndpointDiscoverer<E extends ExposableEndpoint<O>, O exten
 	 * @param operationMethod the operation method
 	 * @param invoker the invoker to use
 	 * @return a created operation
+	 * @since 2.0.6
 	 */
+	protected O createOperation(EndpointId endpointId,
+			DiscoveredOperationMethod operationMethod, OperationInvoker invoker) {
+		return createOperation((endpointId != null) ? endpointId.toString() : null,
+				operationMethod, invoker);
+	}
+
+	/**
+	 * Factory method to create an {@link Operation endpoint operation}.
+	 * @param endpointId the endpoint id
+	 * @param operationMethod the operation method
+	 * @param invoker the invoker to use
+	 * @return a created operation
+	 * @deprecated since 2.0.6 in favor of
+	 * {@link #createOperation(EndpointId, DiscoveredOperationMethod, OperationInvoker)}
+	 */
+	@Deprecated
 	protected abstract O createOperation(String endpointId,
 			DiscoveredOperationMethod operationMethod, OperationInvoker invoker);
 
@@ -414,7 +450,7 @@ public abstract class EndpointDiscoverer<E extends ExposableEndpoint<O>, O exten
 
 		private final Object bean;
 
-		private final String id;
+		private final EndpointId id;
 
 		private boolean enabledByDefault;
 
@@ -426,14 +462,15 @@ public abstract class EndpointDiscoverer<E extends ExposableEndpoint<O>, O exten
 			AnnotationAttributes attributes = AnnotatedElementUtils
 					.findMergedAnnotationAttributes(bean.getClass(), Endpoint.class, true,
 							true);
+			String id = attributes.getString("id");
+			Assert.state(StringUtils.hasText(id),
+					() -> "No @Endpoint id attribute specified for "
+							+ bean.getClass().getName());
 			this.beanName = beanName;
 			this.bean = bean;
-			this.id = attributes.getString("id");
+			this.id = EndpointId.of(id);
 			this.enabledByDefault = (Boolean) attributes.get("enableByDefault");
 			this.filter = getFilter(this.bean.getClass());
-			Assert.state(StringUtils.hasText(this.id),
-					() -> "No @Endpoint id attribute specified for "
-							+ bean.getClass().getName());
 		}
 
 		public void addExtension(ExtensionBean extensionBean) {
@@ -461,7 +498,7 @@ public abstract class EndpointDiscoverer<E extends ExposableEndpoint<O>, O exten
 			return this.bean;
 		}
 
-		public String getId() {
+		public EndpointId getId() {
 			return this.id;
 		}
 
@@ -484,7 +521,7 @@ public abstract class EndpointDiscoverer<E extends ExposableEndpoint<O>, O exten
 
 		private final Object bean;
 
-		private final String endpointId;
+		private final EndpointId endpointId;
 
 		private final Class<?> filter;
 
@@ -500,7 +537,7 @@ public abstract class EndpointDiscoverer<E extends ExposableEndpoint<O>, O exten
 							true);
 			Assert.state(endpointAttributes != null, () -> "Extension "
 					+ endpointType.getName() + " does not specify an endpoint");
-			this.endpointId = endpointAttributes.getString("id");
+			this.endpointId = EndpointId.of(endpointAttributes.getString("id"));
 			this.filter = attributes.getClass("filter");
 		}
 
@@ -512,7 +549,7 @@ public abstract class EndpointDiscoverer<E extends ExposableEndpoint<O>, O exten
 			return this.bean;
 		}
 
-		public String getEndpointId() {
+		public EndpointId getEndpointId() {
 			return this.endpointId;
 		}
 

spring-boot-project/spring-boot-actuator/src/main/java/org/springframework/boot/actuate/endpoint/invoke/OperationInvokerAdvisor.java

@@ -16,6 +16,7 @@
 
 package org.springframework.boot.actuate.endpoint.invoke;
 
+import org.springframework.boot.actuate.endpoint.EndpointId;
 import org.springframework.boot.actuate.endpoint.OperationType;
 
 /**
@@ -34,7 +35,25 @@ public interface OperationInvokerAdvisor {
 	 * @param parameters the operation parameters
 	 * @param invoker the invoker to advise
 	 * @return an potentially new operation invoker with support for additional features
+	 * @since 2.0.6
 	 */
+	default OperationInvoker apply(EndpointId endpointId, OperationType operationType,
+			OperationParameters parameters, OperationInvoker invoker) {
+		return apply((endpointId != null) ? endpointId.toString() : null, operationType,
+				parameters, invoker);
+	}
+
+	/**
+	 * Apply additional functionality to the given invoker.
+	 * @param endpointId the endpoint ID
+	 * @param operationType the operation type
+	 * @param parameters the operation parameters
+	 * @param invoker the invoker to advise
+	 * @return an potentially new operation invoker with support for additional features
+	 * @deprecated since 2.0.6 in favor of
+	 * {@link #apply(EndpointId, OperationType, OperationParameters, OperationInvoker)}
+	 */
+	@Deprecated
 	OperationInvoker apply(String endpointId, OperationType operationType,
 			OperationParameters parameters, OperationInvoker invoker);
 

spring-boot-project/spring-boot-actuator/src/main/java/org/springframework/boot/actuate/endpoint/invoker/cache/CachingOperationInvokerAdvisor.java

@@ -40,6 +40,7 @@ public class CachingOperationInvokerAdvisor implements OperationInvokerAdvisor {
 	}
 
 	@Override
+	@Deprecated
 	public OperationInvoker apply(String endpointId, OperationType operationType,
 			OperationParameters parameters, OperationInvoker invoker) {
 		if (operationType == OperationType.READ && !hasMandatoryParameter(parameters)) {

spring-boot-project/spring-boot-actuator/src/main/java/org/springframework/boot/actuate/endpoint/jmx/EndpointMBean.java

@@ -89,7 +89,7 @@ public class EndpointMBean implements DynamicMBean {
 			throws MBeanException, ReflectionException {
 		JmxOperation operation = this.operations.get(actionName);
 		if (operation == null) {
-			String message = "Endpoint with id '" + this.endpoint.getId()
+			String message = "Endpoint with id '" + this.endpoint.getEndpointId()
 					+ "' has no operation named " + actionName;
 			throw new ReflectionException(new IllegalArgumentException(message), message);
 		}

spring-boot-project/spring-boot-actuator/src/main/java/org/springframework/boot/actuate/endpoint/jmx/JmxEndpointExporter.java

@@ -136,7 +136,7 @@ public class JmxEndpointExporter
 	}
 
 	private String getEndpointDescription(ExposableJmxEndpoint endpoint) {
-		return "endpoint '" + endpoint.getId() + "'";
+		return "endpoint '" + endpoint.getEndpointId() + "'";
 	}
 
 }

spring-boot-project/spring-boot-actuator/src/main/java/org/springframework/boot/actuate/endpoint/jmx/MBeanInfoFactory.java

@@ -58,7 +58,7 @@ class MBeanInfoFactory {
 	}
 
 	private String getDescription(ExposableJmxEndpoint endpoint) {
-		return "MBean operations for endpoint " + endpoint.getId();
+		return "MBean operations for endpoint " + endpoint.getEndpointId();
 	}
 
 	private ModelMBeanOperationInfo[] getMBeanOperations(ExposableJmxEndpoint endpoint) {

spring-boot-project/spring-boot-actuator/src/main/java/org/springframework/boot/actuate/endpoint/jmx/annotation/DiscoveredJmxEndpoint.java

@@ -18,6 +18,7 @@ package org.springframework.boot.actuate.endpoint.jmx.annotation;
 
 import java.util.Collection;
 
+import org.springframework.boot.actuate.endpoint.EndpointId;
 import org.springframework.boot.actuate.endpoint.annotation.AbstractDiscoveredEndpoint;
 import org.springframework.boot.actuate.endpoint.annotation.EndpointDiscoverer;
 import org.springframework.boot.actuate.endpoint.jmx.ExposableJmxEndpoint;
@@ -32,7 +33,8 @@ class DiscoveredJmxEndpoint extends AbstractDiscoveredEndpoint<JmxOperation>
 		implements ExposableJmxEndpoint {
 
 	DiscoveredJmxEndpoint(EndpointDiscoverer<?, ?> discoverer, Object endpointBean,
-			String id, boolean enabledByDefault, Collection<JmxOperation> operations) {
+			EndpointId id, boolean enabledByDefault,
+			Collection<JmxOperation> operations) {
 		super(discoverer, endpointBean, id, enabledByDefault, operations);
 	}
 

spring-boot-project/spring-boot-actuator/src/main/java/org/springframework/boot/actuate/endpoint/jmx/annotation/DiscoveredJmxOperation.java

@@ -26,6 +26,7 @@ import java.util.function.Supplier;
 import java.util.stream.Collectors;
 import java.util.stream.Stream;
 
+import org.springframework.boot.actuate.endpoint.EndpointId;
 import org.springframework.boot.actuate.endpoint.annotation.AbstractDiscoveredOperation;
 import org.springframework.boot.actuate.endpoint.annotation.DiscoveredOperationMethod;
 import org.springframework.boot.actuate.endpoint.invoke.OperationInvoker;
@@ -59,8 +60,8 @@ class DiscoveredJmxOperation extends AbstractDiscoveredOperation implements JmxO
 
 	private final List<JmxOperationParameter> parameters;
 
-	DiscoveredJmxOperation(String endpointId, DiscoveredOperationMethod operationMethod,
-			OperationInvoker invoker) {
+	DiscoveredJmxOperation(EndpointId endpointId,
+			DiscoveredOperationMethod operationMethod, OperationInvoker invoker) {
 		super(operationMethod, invoker);
 		Method method = operationMethod.getMethod();
 		this.name = method.getName();

spring-boot-project/spring-boot-actuator/src/main/java/org/springframework/boot/actuate/endpoint/jmx/annotation/JmxEndpointDiscoverer.java

@@ -19,6 +19,7 @@ package org.springframework.boot.actuate.endpoint.jmx.annotation;
 import java.util.Collection;
 
 import org.springframework.boot.actuate.endpoint.EndpointFilter;
+import org.springframework.boot.actuate.endpoint.EndpointId;
 import org.springframework.boot.actuate.endpoint.annotation.DiscoveredOperationMethod;
 import org.springframework.boot.actuate.endpoint.annotation.EndpointDiscoverer;
 import org.springframework.boot.actuate.endpoint.invoke.OperationInvoker;
@@ -54,15 +55,30 @@ public class JmxEndpointDiscoverer
 	}
 
 	@Override
+	@Deprecated
 	protected ExposableJmxEndpoint createEndpoint(Object endpointBean, String id,
 			boolean enabledByDefault, Collection<JmxOperation> operations) {
+		return createEndpoint(endpointBean, EndpointId.of(id), enabledByDefault,
+				operations);
+	}
+
+	@Override
+	protected ExposableJmxEndpoint createEndpoint(Object endpointBean, EndpointId id,
+			boolean enabledByDefault, Collection<JmxOperation> operations) {
 		return new DiscoveredJmxEndpoint(this, endpointBean, id, enabledByDefault,
 				operations);
 	}
 
 	@Override
+	@Deprecated
 	protected JmxOperation createOperation(String endpointId,
 			DiscoveredOperationMethod operationMethod, OperationInvoker invoker) {
+		return createOperation(EndpointId.of(endpointId), operationMethod, invoker);
+	}
+
+	@Override
+	protected JmxOperation createOperation(EndpointId endpointId,
+			DiscoveredOperationMethod operationMethod, OperationInvoker invoker) {
 		return new DiscoveredJmxOperation(endpointId, operationMethod, invoker);
 	}
 

spring-boot-project/spring-boot-actuator/src/main/java/org/springframework/boot/actuate/endpoint/web/EndpointLinksResolver.java

@@ -76,8 +76,9 @@ public class EndpointLinksResolver {
 				collectLinks(links, (ExposableWebEndpoint) endpoint, normalizedUrl);
 			}
 			else if (endpoint instanceof PathMappedEndpoint) {
-				links.put(endpoint.getId(), createLink(normalizedUrl,
-						((PathMappedEndpoint) endpoint).getRootPath()));
+				String rootPath = ((PathMappedEndpoint) endpoint).getRootPath();
+				Link link = createLink(normalizedUrl, rootPath);
+				links.put(endpoint.getEndpointId().toLowerCaseString(), link);
 			}
 		}
 		return links;

spring-boot-project/spring-boot-actuator/src/main/java/org/springframework/boot/actuate/endpoint/web/PathMappedEndpoints.java

@@ -25,6 +25,7 @@ import java.util.Map;
 import java.util.stream.Collectors;
 import java.util.stream.Stream;
 
+import org.springframework.boot.actuate.endpoint.EndpointId;
 import org.springframework.boot.actuate.endpoint.EndpointsSupplier;
 import org.springframework.util.Assert;
 
@@ -37,7 +38,7 @@ public class PathMappedEndpoints implements Iterable<PathMappedEndpoint> {
 
 	private final String basePath;
 
-	private final Map<String, PathMappedEndpoint> endpoints;
+	private final Map<EndpointId, PathMappedEndpoint> endpoints;
 
 	/**
 	 * Create a new {@link PathMappedEndpoints} instance for the given supplier.
@@ -62,13 +63,14 @@ public class PathMappedEndpoints implements Iterable<PathMappedEndpoint> {
 		this.endpoints = getEndpoints(suppliers);
 	}
 
-	private Map<String, PathMappedEndpoint> getEndpoints(
+	private Map<EndpointId, PathMappedEndpoint> getEndpoints(
 			Collection<EndpointsSupplier<?>> suppliers) {
-		Map<String, PathMappedEndpoint> endpoints = new LinkedHashMap<>();
+		Map<EndpointId, PathMappedEndpoint> endpoints = new LinkedHashMap<>();
 		suppliers.forEach((supplier) -> {
 			supplier.getEndpoints().forEach((endpoint) -> {
 				if (endpoint instanceof PathMappedEndpoint) {
-					endpoints.put(endpoint.getId(), (PathMappedEndpoint) endpoint);
+					endpoints.put(endpoint.getEndpointId(),
+							(PathMappedEndpoint) endpoint);
 				}
 			});
 		});
@@ -88,8 +90,21 @@ public class PathMappedEndpoints implements Iterable<PathMappedEndpoint> {
 	 * endpoint cannot be found.
 	 * @param endpointId the endpoint ID
 	 * @return the root path or {@code null}
+	 * @deprecated since 2.0.6 in favor of {@link #getRootPath(EndpointId)}
 	 */
+	@Deprecated
 	public String getRootPath(String endpointId) {
+		return getRootPath(EndpointId.of(endpointId));
+	}
+
+	/**
+	 * Return the root path for the endpoint with the given ID or {@code null} if the
+	 * endpoint cannot be found.
+	 * @param endpointId the endpoint ID
+	 * @return the root path or {@code null}
+	 * @since 2.0.6
+	 */
+	public String getRootPath(EndpointId endpointId) {
 		PathMappedEndpoint endpoint = getEndpoint(endpointId);
 		return (endpoint != null) ? endpoint.getRootPath() : null;
 	}
@@ -99,8 +114,21 @@ public class PathMappedEndpoints implements Iterable<PathMappedEndpoint> {
 	 * endpoint cannot be found.
 	 * @param endpointId the endpoint ID
 	 * @return the full path or {@code null}
+	 * @deprecated since 2.0.6 in favor of {@link #getPath(EndpointId)}
 	 */
+	@Deprecated
 	public String getPath(String endpointId) {
+		return getPath(EndpointId.of(endpointId));
+	}
+
+	/**
+	 * Return the full path for the endpoint with the given ID or {@code null} if the
+	 * endpoint cannot be found.
+	 * @param endpointId the endpoint ID
+	 * @return the full path or {@code null}
+	 * @since 2.0.6
+	 */
+	public String getPath(EndpointId endpointId) {
 		return getPath(getEndpoint(endpointId));
 	}
 
@@ -125,8 +153,21 @@ public class PathMappedEndpoints implements Iterable<PathMappedEndpoint> {
 	 * endpoint cannot be found.
 	 * @param endpointId the endpoint ID
 	 * @return the path mapped endpoint or {@code null}
+	 * @deprecated since 2.0.6 in favor of {@link #getEndpoint(EndpointId)}
 	 */
+	@Deprecated
 	public PathMappedEndpoint getEndpoint(String endpointId) {
+		return getEndpoint(EndpointId.of(endpointId));
+	}
+
+	/**
+	 * Return the {@link PathMappedEndpoint} with the given ID or {@code null} if the
+	 * endpoint cannot be found.
+	 * @param endpointId the endpoint ID
+	 * @return the path mapped endpoint or {@code null}
+	 * @since 2.0.6
+	 */
+	public PathMappedEndpoint getEndpoint(EndpointId endpointId) {
 		return this.endpoints.get(endpointId);
 	}
 

spring-boot-project/spring-boot-actuator/src/main/java/org/springframework/boot/actuate/endpoint/web/PathMapper.java

@@ -16,6 +16,8 @@
 
 package org.springframework.boot.actuate.endpoint.web;
 
+import org.springframework.boot.actuate.endpoint.EndpointId;
+
 /**
  * Strategy interface used to provide a mapping between an endpoint ID and the root path
  * where it will be exposed.
@@ -31,15 +33,41 @@ public interface PathMapper {
 	 * Resolve the root path for the endpoint with the specified {@code endpointId}.
 	 * @param endpointId the id of an endpoint
 	 * @return the path of the endpoint
+	 * @since 2.0.6
+	 */
+	default String getRootPath(EndpointId endpointId) {
+		return getRootPath((endpointId != null) ? endpointId.toString() : null);
+	}
+
+	/**
+	 * Resolve the root path for the endpoint with the specified {@code endpointId}.
+	 * @param endpointId the id of an endpoint
+	 * @return the path of the endpoint
+	 * @deprecated since 2.0.6 in favor of {@link #getRootPath(EndpointId)}
 	 */
+	@Deprecated
 	String getRootPath(String endpointId);
 
 	/**
 	 * Returns an {@link PathMapper} that uses the endpoint ID as the path.
-	 * @return an {@link PathMapper} that uses the endpoint ID as the path
+	 * @return an {@link PathMapper} that uses the lowercase endpoint ID as the path
 	 */
 	static PathMapper useEndpointId() {
-		return (endpointId) -> endpointId;
+		return new PathMapper() {
+
+			@Override
+			@Deprecated
+			public String getRootPath(String endpointId) {
+				return getRootPath(EndpointId.of(endpointId));
+			}
+
+			@Override
+			public String getRootPath(EndpointId endpointId) {
+				return endpointId.toLowerCaseString();
+			}
+
+		};
+
 	}
 
 }

spring-boot-project/spring-boot-actuator/src/main/java/org/springframework/boot/actuate/endpoint/web/ServletEndpointRegistrar.java

@@ -67,7 +67,7 @@ public class ServletEndpointRegistrar implements ServletContextInitializer {
 
 	private void register(ServletContext servletContext,
 			ExposableServletEndpoint endpoint) {
-		String name = endpoint.getId() + "-actuator-endpoint";
+		String name = endpoint.getEndpointId().toLowerCaseString() + "-actuator-endpoint";
 		String path = this.basePath + "/" + endpoint.getRootPath();
 		String urlMapping = path.endsWith("/") ? path + "*" : path + "/*";
 		EndpointServlet endpointServlet = endpoint.getEndpointServlet();

spring-boot-project/spring-boot-actuator/src/main/java/org/springframework/boot/actuate/endpoint/web/annotation/ControllerEndpointDiscoverer.java

@@ -20,6 +20,7 @@ import java.util.Collection;
 import java.util.Collections;
 
 import org.springframework.boot.actuate.endpoint.EndpointFilter;
+import org.springframework.boot.actuate.endpoint.EndpointId;
 import org.springframework.boot.actuate.endpoint.Operation;
 import org.springframework.boot.actuate.endpoint.annotation.DiscoveredOperationMethod;
 import org.springframework.boot.actuate.endpoint.annotation.EndpointDiscoverer;
@@ -67,16 +68,31 @@ public class ControllerEndpointDiscoverer
 	}
 
 	@Override
+	@Deprecated
 	protected ExposableControllerEndpoint createEndpoint(Object endpointBean, String id,
 			boolean enabledByDefault, Collection<Operation> operations) {
+		return createEndpoint(endpointBean, (id != null) ? EndpointId.of(id) : null,
+				enabledByDefault, operations);
+	}
+
+	@Override
+	protected ExposableControllerEndpoint createEndpoint(Object endpointBean,
+			EndpointId id, boolean enabledByDefault, Collection<Operation> operations) {
 		String rootPath = this.endpointPathMapper.getRootPath(id);
 		return new DiscoveredControllerEndpoint(this, endpointBean, id, rootPath,
 				enabledByDefault);
 	}
 
 	@Override
+	@Deprecated
 	protected Operation createOperation(String endpointId,
 			DiscoveredOperationMethod operationMethod, OperationInvoker invoker) {
+		return createOperation(EndpointId.of(endpointId), operationMethod, invoker);
+	}
+
+	@Override
+	protected Operation createOperation(EndpointId endpointId,
+			DiscoveredOperationMethod operationMethod, OperationInvoker invoker) {
 		throw new IllegalStateException(
 				"ControllerEndpoints must not declare operations");
 	}

spring-boot-project/spring-boot-actuator/src/main/java/org/springframework/boot/actuate/endpoint/web/annotation/DiscoveredControllerEndpoint.java

@@ -18,6 +18,7 @@ package org.springframework.boot.actuate.endpoint.web.annotation;
 
 import java.util.Collections;
 
+import org.springframework.boot.actuate.endpoint.EndpointId;
 import org.springframework.boot.actuate.endpoint.Operation;
 import org.springframework.boot.actuate.endpoint.annotation.AbstractDiscoveredEndpoint;
 import org.springframework.boot.actuate.endpoint.annotation.EndpointDiscoverer;
@@ -33,7 +34,7 @@ class DiscoveredControllerEndpoint extends AbstractDiscoveredEndpoint<Operation>
 	private final String rootPath;
 
 	DiscoveredControllerEndpoint(EndpointDiscoverer<?, ?> discoverer, Object endpointBean,
-			String id, String rootPath, boolean enabledByDefault) {
+			EndpointId id, String rootPath, boolean enabledByDefault) {
 		super(discoverer, endpointBean, id, enabledByDefault, Collections.emptyList());
 		this.rootPath = rootPath;
 	}

spring-boot-project/spring-boot-actuator/src/main/java/org/springframework/boot/actuate/endpoint/web/annotation/DiscoveredServletEndpoint.java

@@ -19,6 +19,7 @@ package org.springframework.boot.actuate.endpoint.web.annotation;
 import java.util.Collections;
 import java.util.function.Supplier;
 
+import org.springframework.boot.actuate.endpoint.EndpointId;
 import org.springframework.boot.actuate.endpoint.Operation;
 import org.springframework.boot.actuate.endpoint.annotation.AbstractDiscoveredEndpoint;
 import org.springframework.boot.actuate.endpoint.annotation.EndpointDiscoverer;
@@ -39,7 +40,7 @@ class DiscoveredServletEndpoint extends AbstractDiscoveredEndpoint<Operation>
 	private final EndpointServlet endpointServlet;
 
 	DiscoveredServletEndpoint(EndpointDiscoverer<?, ?> discoverer, Object endpointBean,
-			String id, String rootPath, boolean enabledByDefault) {
+			EndpointId id, String rootPath, boolean enabledByDefault) {
 		super(discoverer, endpointBean, id, enabledByDefault, Collections.emptyList());
 		String beanType = endpointBean.getClass().getName();
 		Assert.state(endpointBean instanceof Supplier,

spring-boot-project/spring-boot-actuator/src/main/java/org/springframework/boot/actuate/endpoint/web/annotation/DiscoveredWebEndpoint.java

@@ -18,6 +18,7 @@ package org.springframework.boot.actuate.endpoint.web.annotation;
 
 import java.util.Collection;
 
+import org.springframework.boot.actuate.endpoint.EndpointId;
 import org.springframework.boot.actuate.endpoint.annotation.AbstractDiscoveredEndpoint;
 import org.springframework.boot.actuate.endpoint.annotation.EndpointDiscoverer;
 import org.springframework.boot.actuate.endpoint.web.ExposableWebEndpoint;
@@ -34,7 +35,7 @@ class DiscoveredWebEndpoint extends AbstractDiscoveredEndpoint<WebOperation>
 	private final String rootPath;
 
 	DiscoveredWebEndpoint(EndpointDiscoverer<?, ?> discoverer, Object endpointBean,
-			String id, String rootPath, boolean enabledByDefault,
+			EndpointId id, String rootPath, boolean enabledByDefault,
 			Collection<WebOperation> operations) {
 		super(discoverer, endpointBean, id, enabledByDefault, operations);
 		this.rootPath = rootPath;

spring-boot-project/spring-boot-actuator/src/main/java/org/springframework/boot/actuate/endpoint/web/annotation/DiscoveredWebOperation.java

@@ -23,6 +23,7 @@ import java.util.stream.Stream;
 
 import org.reactivestreams.Publisher;
 
+import org.springframework.boot.actuate.endpoint.EndpointId;
 import org.springframework.boot.actuate.endpoint.annotation.AbstractDiscoveredOperation;
 import org.springframework.boot.actuate.endpoint.annotation.DiscoveredOperationMethod;
 import org.springframework.boot.actuate.endpoint.annotation.Selector;
@@ -51,8 +52,9 @@ class DiscoveredWebOperation extends AbstractDiscoveredOperation implements WebO
 
 	private final WebOperationRequestPredicate requestPredicate;
 
-	DiscoveredWebOperation(String endpointId, DiscoveredOperationMethod operationMethod,
-			OperationInvoker invoker, WebOperationRequestPredicate requestPredicate) {
+	DiscoveredWebOperation(EndpointId endpointId,
+			DiscoveredOperationMethod operationMethod, OperationInvoker invoker,
+			WebOperationRequestPredicate requestPredicate) {
 		super(operationMethod, invoker);
 		Method method = operationMethod.getMethod();
 		this.id = getId(endpointId, method);
@@ -60,7 +62,7 @@ class DiscoveredWebOperation extends AbstractDiscoveredOperation implements WebO
 		this.requestPredicate = requestPredicate;
 	}
 
-	private String getId(String endpointId, Method method) {
+	private String getId(EndpointId endpointId, Method method) {
 		return endpointId + Stream.of(method.getParameters()).filter(this::hasSelector)
 				.map(this::dashName).collect(Collectors.joining());
 	}

spring-boot-project/spring-boot-actuator/src/main/java/org/springframework/boot/actuate/endpoint/web/annotation/RequestPredicateFactory.java

@@ -23,6 +23,7 @@ import java.util.Collections;
 import java.util.stream.Collectors;
 import java.util.stream.Stream;
 
+import org.springframework.boot.actuate.endpoint.EndpointId;
 import org.springframework.boot.actuate.endpoint.OperationType;
 import org.springframework.boot.actuate.endpoint.annotation.DiscoveredOperationMethod;
 import org.springframework.boot.actuate.endpoint.annotation.Selector;
@@ -50,7 +51,7 @@ class RequestPredicateFactory {
 		this.endpointMediaTypes = endpointMediaTypes;
 	}
 
-	public WebOperationRequestPredicate getRequestPredicate(String endpointId,
+	public WebOperationRequestPredicate getRequestPredicate(EndpointId endpointId,
 			String rootPath, DiscoveredOperationMethod operationMethod) {
 		Method method = operationMethod.getMethod();
 		String path = getPath(rootPath, method);

spring-boot-project/spring-boot-actuator/src/main/java/org/springframework/boot/actuate/endpoint/web/annotation/ServletEndpointDiscoverer.java

@@ -20,6 +20,7 @@ import java.util.Collection;
 import java.util.Collections;
 
 import org.springframework.boot.actuate.endpoint.EndpointFilter;
+import org.springframework.boot.actuate.endpoint.EndpointId;
 import org.springframework.boot.actuate.endpoint.Operation;
 import org.springframework.boot.actuate.endpoint.annotation.DiscoveredOperationMethod;
 import org.springframework.boot.actuate.endpoint.annotation.EndpointDiscoverer;
@@ -66,16 +67,31 @@ public class ServletEndpointDiscoverer
 	}
 
 	@Override
+	@Deprecated
 	protected ExposableServletEndpoint createEndpoint(Object endpointBean, String id,
 			boolean enabledByDefault, Collection<Operation> operations) {
+		return createEndpoint(endpointBean, EndpointId.of(id), enabledByDefault,
+				operations);
+	}
+
+	@Override
+	protected ExposableServletEndpoint createEndpoint(Object endpointBean, EndpointId id,
+			boolean enabledByDefault, Collection<Operation> operations) {
 		String rootPath = this.endpointPathMapper.getRootPath(id);
 		return new DiscoveredServletEndpoint(this, endpointBean, id, rootPath,
 				enabledByDefault);
 	}
 
 	@Override
+	@Deprecated
 	protected Operation createOperation(String endpointId,
 			DiscoveredOperationMethod operationMethod, OperationInvoker invoker) {
+		return createOperation(EndpointId.of(endpointId), operationMethod, invoker);
+	}
+
+	@Override
+	protected Operation createOperation(EndpointId endpointId,
+			DiscoveredOperationMethod operationMethod, OperationInvoker invoker) {
 		throw new IllegalStateException("ServletEndpoints must not declare operations");
 	}
 

spring-boot-project/spring-boot-actuator/src/main/java/org/springframework/boot/actuate/endpoint/web/annotation/WebEndpointDiscoverer.java

@@ -19,6 +19,7 @@ package org.springframework.boot.actuate.endpoint.web.annotation;
 import java.util.Collection;
 
 import org.springframework.boot.actuate.endpoint.EndpointFilter;
+import org.springframework.boot.actuate.endpoint.EndpointId;
 import org.springframework.boot.actuate.endpoint.annotation.DiscoveredOperationMethod;
 import org.springframework.boot.actuate.endpoint.annotation.EndpointDiscoverer;
 import org.springframework.boot.actuate.endpoint.invoke.OperationInvoker;
@@ -68,16 +69,31 @@ public class WebEndpointDiscoverer
 	}
 
 	@Override
+	@Deprecated
 	protected ExposableWebEndpoint createEndpoint(Object endpointBean, String id,
 			boolean enabledByDefault, Collection<WebOperation> operations) {
+		return createEndpoint(endpointBean, EndpointId.of(id), enabledByDefault,
+				operations);
+	}
+
+	@Override
+	protected ExposableWebEndpoint createEndpoint(Object endpointBean, EndpointId id,
+			boolean enabledByDefault, Collection<WebOperation> operations) {
 		String rootPath = this.endpointPathMapper.getRootPath(id);
 		return new DiscoveredWebEndpoint(this, endpointBean, id, rootPath,
 				enabledByDefault, operations);
 	}
 
 	@Override
+	@Deprecated
 	protected WebOperation createOperation(String endpointId,
 			DiscoveredOperationMethod operationMethod, OperationInvoker invoker) {
+		return createOperation(EndpointId.of(endpointId), operationMethod, invoker);
+	}
+
+	@Override
+	protected WebOperation createOperation(EndpointId endpointId,
+			DiscoveredOperationMethod operationMethod, OperationInvoker invoker) {
 		String rootPath = this.endpointPathMapper.getRootPath(endpointId);
 		WebOperationRequestPredicate requestPredicate = this.requestPredicateFactory
 				.getRequestPredicate(endpointId, rootPath, operationMethod);

spring-boot-project/spring-boot-actuator/src/test/java/org/springframework/boot/actuate/endpoint/EndpointIdTests.java

+/*
+ * Copyright 2012-2018 the original author or authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.springframework.boot.actuate.endpoint;
+
+import org.junit.Rule;
+import org.junit.Test;
+import org.junit.rules.ExpectedException;
+
+import static org.assertj.core.api.Assertions.assertThat;
+
+/**
+ * Tests for {@link EndpointId}.
+ *
+ * @author Phillip Webb
+ */
+public class EndpointIdTests {
+
+	@Rule
+	public ExpectedException thrown = ExpectedException.none();
+
+	@Test
+	public void ofWhenNullThorowsException() {
+		this.thrown.expect(IllegalArgumentException.class);
+		this.thrown.expectMessage("Value must not be empty");
+		EndpointId.of(null);
+	}
+
+	@Test
+	public void ofWhenEmptyThrowsException() {
+		this.thrown.expect(IllegalArgumentException.class);
+		this.thrown.expectMessage("Value must not be empty");
+		EndpointId.of("");
+	}
+
+	@Test
+	public void ofWhenContainsDashThrowsException() {
+		this.thrown.expect(IllegalArgumentException.class);
+		this.thrown.expectMessage("Value must be alpha-numeric");
+		EndpointId.of("foo-bar");
+	}
+
+	@Test
+	public void ofWhenHasBadCharThrowsException() {
+		this.thrown.expect(IllegalArgumentException.class);
+		this.thrown.expectMessage("Value must be alpha-numeric");
+		EndpointId.of("foo!bar");
+	}
+
+	@Test
+	public void ofWhenStartsWithNumberThrowsException() {
+		this.thrown.expect(IllegalArgumentException.class);
+		this.thrown.expectMessage("Value must not start with a number");
+		EndpointId.of("1foo");
+	}
+
+	@Test
+	public void ofWhenStartsWithUppercaseLetterThrowsException() {
+		this.thrown.expect(IllegalArgumentException.class);
+		this.thrown.expectMessage("Value must not start with an uppercase letter");
+		EndpointId.of("Foo");
+	}
+
+	@Test
+	public void equalsAndHashCode() {
+		EndpointId one = EndpointId.of("foobar");
+		EndpointId two = EndpointId.of("fooBar");
+		EndpointId three = EndpointId.of("barfoo");
+		assertThat(one.hashCode()).isEqualTo(two.hashCode());
+		assertThat(one).isEqualTo(one).isEqualTo(two).isNotEqualTo(three);
+	}
+
+	@Test
+	public void toLowerCaseStringReturnsLowercase() {
+		assertThat(EndpointId.of("fooBar").toLowerCaseString()).isEqualTo("foobar");
+	}
+
+	@Test
+	public void toStringReturnsString() {
+		assertThat(EndpointId.of("fooBar").toString()).isEqualTo("fooBar");
+	}
+
+}

spring-boot-project/spring-boot-actuator/src/test/java/org/springframework/boot/actuate/endpoint/annotation/DiscoveredOperationsFactoryTests.java

@@ -25,6 +25,7 @@ import java.util.Map;
 import org.junit.Before;
 import org.junit.Test;
 
+import org.springframework.boot.actuate.endpoint.EndpointId;
 import org.springframework.boot.actuate.endpoint.InvocationContext;
 import org.springframework.boot.actuate.endpoint.OperationType;
 import org.springframework.boot.actuate.endpoint.SecurityContext;
@@ -60,8 +61,8 @@ public class DiscoveredOperationsFactoryTests {
 
 	@Test
 	public void createOperationsWhenHasReadMethodShouldCreateOperation() {
-		Collection<TestOperation> operations = this.factory.createOperations("test",
-				new ExampleRead());
+		Collection<TestOperation> operations = this.factory
+				.createOperations(EndpointId.of("test"), new ExampleRead());
 		assertThat(operations).hasSize(1);
 		TestOperation operation = getFirst(operations);
 		assertThat(operation.getType()).isEqualTo(OperationType.READ);
@@ -69,8 +70,8 @@ public class DiscoveredOperationsFactoryTests {
 
 	@Test
 	public void createOperationsWhenHasWriteMethodShouldCreateOperation() {
-		Collection<TestOperation> operations = this.factory.createOperations("test",
-				new ExampleWrite());
+		Collection<TestOperation> operations = this.factory
+				.createOperations(EndpointId.of("test"), new ExampleWrite());
 		assertThat(operations).hasSize(1);
 		TestOperation operation = getFirst(operations);
 		assertThat(operation.getType()).isEqualTo(OperationType.WRITE);
@@ -78,8 +79,8 @@ public class DiscoveredOperationsFactoryTests {
 
 	@Test
 	public void createOperationsWhenHasDeleteMethodShouldCreateOperation() {
-		Collection<TestOperation> operations = this.factory.createOperations("test",
-				new ExampleDelete());
+		Collection<TestOperation> operations = this.factory
+				.createOperations(EndpointId.of("test"), new ExampleDelete());
 		assertThat(operations).hasSize(1);
 		TestOperation operation = getFirst(operations);
 		assertThat(operation.getType()).isEqualTo(OperationType.DELETE);
@@ -87,8 +88,8 @@ public class DiscoveredOperationsFactoryTests {
 
 	@Test
 	public void createOperationsWhenMultipleShouldReturnMultiple() {
-		Collection<TestOperation> operations = this.factory.createOperations("test",
-				new ExampleMultiple());
+		Collection<TestOperation> operations = this.factory
+				.createOperations(EndpointId.of("test"), new ExampleMultiple());
 		assertThat(operations).hasSize(2);
 		assertThat(operations.stream().map(TestOperation::getType))
 				.containsOnly(OperationType.READ, OperationType.WRITE);
@@ -96,8 +97,8 @@ public class DiscoveredOperationsFactoryTests {
 
 	@Test
 	public void createOperationsShouldProvideOperationMethod() {
-		TestOperation operation = getFirst(
-				this.factory.createOperations("test", new ExampleWithParams()));
+		TestOperation operation = getFirst(this.factory
+				.createOperations(EndpointId.of("test"), new ExampleWithParams()));
 		OperationMethod operationMethod = operation.getOperationMethod();
 		assertThat(operationMethod.getMethod().getName()).isEqualTo("read");
 		assertThat(operationMethod.getParameters().hasParameters()).isTrue();
@@ -105,8 +106,8 @@ public class DiscoveredOperationsFactoryTests {
 
 	@Test
 	public void createOperationsShouldProviderInvoker() {
-		TestOperation operation = getFirst(
-				this.factory.createOperations("test", new ExampleWithParams()));
+		TestOperation operation = getFirst(this.factory
+				.createOperations(EndpointId.of("test"), new ExampleWithParams()));
 		Map<String, Object> params = Collections.singletonMap("name", 123);
 		Object result = operation
 				.invoke(new InvocationContext(mock(SecurityContext.class), params));
@@ -118,10 +119,10 @@ public class DiscoveredOperationsFactoryTests {
 		TestOperationInvokerAdvisor advisor = new TestOperationInvokerAdvisor();
 		this.invokerAdvisors.add(advisor);
 		TestOperation operation = getFirst(
-				this.factory.createOperations("test", new ExampleRead()));
+				this.factory.createOperations(EndpointId.of("test"), new ExampleRead()));
 		operation.invoke(new InvocationContext(mock(SecurityContext.class),
 				Collections.emptyMap()));
-		assertThat(advisor.getEndpointId()).isEqualTo("test");
+		assertThat(advisor.getEndpointId()).isEqualTo(EndpointId.of("test"));
 		assertThat(advisor.getOperationType()).isEqualTo(OperationType.READ);
 		assertThat(advisor.getParameters()).isEmpty();
 	}
@@ -189,7 +190,7 @@ public class DiscoveredOperationsFactoryTests {
 		}
 
 		@Override
-		protected TestOperation createOperation(String endpointId,
+		protected TestOperation createOperation(EndpointId endpointId,
 				DiscoveredOperationMethod operationMethod, OperationInvoker invoker) {
 			return new TestOperation(endpointId, operationMethod, invoker);
 		}
@@ -198,7 +199,7 @@ public class DiscoveredOperationsFactoryTests {
 
 	static class TestOperation extends AbstractDiscoveredOperation {
 
-		TestOperation(String endpointId, DiscoveredOperationMethod operationMethod,
+		TestOperation(EndpointId endpointId, DiscoveredOperationMethod operationMethod,
 				OperationInvoker invoker) {
 			super(operationMethod, invoker);
 		}
@@ -207,14 +208,14 @@ public class DiscoveredOperationsFactoryTests {
 
 	static class TestOperationInvokerAdvisor implements OperationInvokerAdvisor {
 
-		private String endpointId;
+		private EndpointId endpointId;
 
 		private OperationType operationType;
 
 		private OperationParameters parameters;
 
 		@Override
-		public OperationInvoker apply(String endpointId, OperationType operationType,
+		public OperationInvoker apply(EndpointId endpointId, OperationType operationType,
 				OperationParameters parameters, OperationInvoker invoker) {
 			this.endpointId = endpointId;
 			this.operationType = operationType;
@@ -222,7 +223,14 @@ public class DiscoveredOperationsFactoryTests {
 			return invoker;
 		}
 
-		public String getEndpointId() {
+		@Override
+		@Deprecated
+		public OperationInvoker apply(String endpointId, OperationType operationType,
+				OperationParameters parameters, OperationInvoker invoker) {
+			throw new IllegalStateException();
+		}
+
+		public EndpointId getEndpointId() {
 			return this.endpointId;
 		}
 

spring-boot-project/spring-boot-actuator/src/test/java/org/springframework/boot/actuate/endpoint/invoker/cache/CachingOperationInvokerAdvisorTests.java

@@ -24,6 +24,7 @@ import org.junit.Test;
 import org.mockito.Mock;
 import org.mockito.MockitoAnnotations;
 
+import org.springframework.boot.actuate.endpoint.EndpointId;
 import org.springframework.boot.actuate.endpoint.OperationType;
 import org.springframework.boot.actuate.endpoint.SecurityContext;
 import org.springframework.boot.actuate.endpoint.invoke.OperationInvoker;
@@ -63,8 +64,8 @@ public class CachingOperationInvokerAdvisorTests {
 	@Test
 	public void applyWhenOperationIsNotReadShouldNotAddAdvise() {
 		OperationParameters parameters = getParameters("get");
-		OperationInvoker advised = this.advisor.apply("foo", OperationType.WRITE,
-				parameters, this.invoker);
+		OperationInvoker advised = this.advisor.apply(EndpointId.of("foo"),
+				OperationType.WRITE, parameters, this.invoker);
 		assertThat(advised).isSameAs(this.invoker);
 	}
 
@@ -72,8 +73,8 @@ public class CachingOperationInvokerAdvisorTests {
 	public void applyWhenHasAtLeaseOneMandatoryParameterShouldNotAddAdvise() {
 		OperationParameters parameters = getParameters("getWithParameters", String.class,
 				String.class);
-		OperationInvoker advised = this.advisor.apply("foo", OperationType.READ,
-				parameters, this.invoker);
+		OperationInvoker advised = this.advisor.apply(EndpointId.of("foo"),
+				OperationType.READ, parameters, this.invoker);
 		assertThat(advised).isSameAs(this.invoker);
 	}
 
@@ -81,8 +82,8 @@ public class CachingOperationInvokerAdvisorTests {
 	public void applyWhenTimeToLiveReturnsNullShouldNotAddAdvise() {
 		OperationParameters parameters = getParameters("get");
 		given(this.timeToLive.apply(any())).willReturn(null);
-		OperationInvoker advised = this.advisor.apply("foo", OperationType.READ,
-				parameters, this.invoker);
+		OperationInvoker advised = this.advisor.apply(EndpointId.of("foo"),
+				OperationType.READ, parameters, this.invoker);
 		assertThat(advised).isSameAs(this.invoker);
 		verify(this.timeToLive).apply("foo");
 	}
@@ -91,8 +92,8 @@ public class CachingOperationInvokerAdvisorTests {
 	public void applyWhenTimeToLiveIsZeroShouldNotAddAdvise() {
 		OperationParameters parameters = getParameters("get");
 		given(this.timeToLive.apply(any())).willReturn(0L);
-		OperationInvoker advised = this.advisor.apply("foo", OperationType.READ,
-				parameters, this.invoker);
+		OperationInvoker advised = this.advisor.apply(EndpointId.of("foo"),
+				OperationType.READ, parameters, this.invoker);
 		assertThat(advised).isSameAs(this.invoker);
 		verify(this.timeToLive).apply("foo");
 	}
@@ -121,8 +122,8 @@ public class CachingOperationInvokerAdvisorTests {
 	}
 
 	private void assertAdviseIsApplied(OperationParameters parameters) {
-		OperationInvoker advised = this.advisor.apply("foo", OperationType.READ,
-				parameters, this.invoker);
+		OperationInvoker advised = this.advisor.apply(EndpointId.of("foo"),
+				OperationType.READ, parameters, this.invoker);
 		assertThat(advised).isInstanceOf(CachingOperationInvoker.class);
 		assertThat(ReflectionTestUtils.getField(advised, "invoker"))
 				.isEqualTo(this.invoker);

spring-boot-project/spring-boot-actuator/src/test/java/org/springframework/boot/actuate/endpoint/jmx/JmxEndpointExporterTests.java

@@ -190,9 +190,8 @@ public class JmxEndpointExporterTests {
 		@Override
 		public ObjectName getObjectName(ExposableJmxEndpoint endpoint)
 				throws MalformedObjectNameException {
-			return (endpoint != null)
-					? new ObjectName("boot:type=Endpoint,name=" + endpoint.getId())
-					: null;
+			return (endpoint != null) ? new ObjectName(
+					"boot:type=Endpoint,name=" + endpoint.getEndpointId()) : null;
 		}
 
 	}

spring-boot-project/spring-boot-actuator/src/test/java/org/springframework/boot/actuate/endpoint/jmx/annotation/DiscoveredJmxOperationTests.java

@@ -25,6 +25,7 @@ import java.util.Map;
 
 import org.junit.Test;
 
+import org.springframework.boot.actuate.endpoint.EndpointId;
 import org.springframework.boot.actuate.endpoint.OperationType;
 import org.springframework.boot.actuate.endpoint.annotation.DiscoveredOperationMethod;
 import org.springframework.boot.actuate.endpoint.invoke.OperationInvoker;
@@ -126,8 +127,8 @@ public class DiscoveredJmxOperationTests {
 		annotationAttributes.put("produces", "application/xml");
 		DiscoveredOperationMethod operationMethod = new DiscoveredOperationMethod(method,
 				OperationType.READ, annotationAttributes);
-		DiscoveredJmxOperation operation = new DiscoveredJmxOperation("test",
-				operationMethod, mock(OperationInvoker.class));
+		DiscoveredJmxOperation operation = new DiscoveredJmxOperation(
+				EndpointId.of("test"), operationMethod, mock(OperationInvoker.class));
 		return operation;
 	}
 

spring-boot-project/spring-boot-actuator/src/test/java/org/springframework/boot/actuate/endpoint/jmx/annotation/JmxEndpointDiscovererTests.java

@@ -28,6 +28,7 @@ import org.junit.Rule;
 import org.junit.Test;
 import org.junit.rules.ExpectedException;
 
+import org.springframework.boot.actuate.endpoint.EndpointId;
 import org.springframework.boot.actuate.endpoint.annotation.DeleteOperation;
 import org.springframework.boot.actuate.endpoint.annotation.Endpoint;
 import org.springframework.boot.actuate.endpoint.annotation.ReadOperation;
@@ -70,10 +71,10 @@ public class JmxEndpointDiscovererTests {
 	@Test
 	public void getEndpointsShouldDiscoverStandardEndpoints() {
 		load(TestEndpoint.class, (discoverer) -> {
-			Map<String, ExposableJmxEndpoint> endpoints = discover(discoverer);
-			assertThat(endpoints).containsOnlyKeys("test");
+			Map<EndpointId, ExposableJmxEndpoint> endpoints = discover(discoverer);
+			assertThat(endpoints).containsOnlyKeys(EndpointId.of("test"));
 			Map<String, JmxOperation> operationByName = mapOperations(
-					endpoints.get("test").getOperations());
+					endpoints.get(EndpointId.of("test")).getOperations());
 			assertThat(operationByName).containsOnlyKeys("getAll", "getSomething",
 					"update", "deleteSomething");
 			JmxOperation getAll = operationByName.get("getAll");
@@ -106,8 +107,9 @@ public class JmxEndpointDiscovererTests {
 	@Test
 	public void getEndpointsWhenHasFilteredEndpointShouldOnlyDiscoverJmxEndpoints() {
 		load(MultipleEndpointsConfiguration.class, (discoverer) -> {
-			Map<String, ExposableJmxEndpoint> endpoints = discover(discoverer);
-			assertThat(endpoints).containsOnlyKeys("test", "jmx");
+			Map<EndpointId, ExposableJmxEndpoint> endpoints = discover(discoverer);
+			assertThat(endpoints).containsOnlyKeys(EndpointId.of("test"),
+					EndpointId.of("jmx"));
 		});
 	}
 
@@ -125,19 +127,19 @@ public class JmxEndpointDiscovererTests {
 	@Test
 	public void getEndpointsWhenHasJmxExtensionShouldOverrideStandardEndpoint() {
 		load(OverriddenOperationJmxEndpointConfiguration.class, (discoverer) -> {
-			Map<String, ExposableJmxEndpoint> endpoints = discover(discoverer);
-			assertThat(endpoints).containsOnlyKeys("test");
-			assertJmxTestEndpoint(endpoints.get("test"));
+			Map<EndpointId, ExposableJmxEndpoint> endpoints = discover(discoverer);
+			assertThat(endpoints).containsOnlyKeys(EndpointId.of("test"));
+			assertJmxTestEndpoint(endpoints.get(EndpointId.of("test")));
 		});
 	}
 
 	@Test
 	public void getEndpointsWhenHasJmxExtensionWithNewOperationAddsExtraOperation() {
 		load(AdditionalOperationJmxEndpointConfiguration.class, (discoverer) -> {
-			Map<String, ExposableJmxEndpoint> endpoints = discover(discoverer);
-			assertThat(endpoints).containsOnlyKeys("test");
+			Map<EndpointId, ExposableJmxEndpoint> endpoints = discover(discoverer);
+			assertThat(endpoints).containsOnlyKeys(EndpointId.of("test"));
 			Map<String, JmxOperation> operationByName = mapOperations(
-					endpoints.get("test").getOperations());
+					endpoints.get(EndpointId.of("test")).getOperations());
 			assertThat(operationByName).containsOnlyKeys("getAll", "getSomething",
 					"update", "deleteSomething", "getAnother");
 			JmxOperation getAnother = operationByName.get("getAnother");
@@ -150,10 +152,10 @@ public class JmxEndpointDiscovererTests {
 	@Test
 	public void getEndpointsWhenHasCacheWithTtlShouldCacheReadOperationWithTtlValue() {
 		load(TestEndpoint.class, (id) -> 500L, (discoverer) -> {
-			Map<String, ExposableJmxEndpoint> endpoints = discover(discoverer);
-			assertThat(endpoints).containsOnlyKeys("test");
+			Map<EndpointId, ExposableJmxEndpoint> endpoints = discover(discoverer);
+			assertThat(endpoints).containsOnlyKeys(EndpointId.of("test"));
 			Map<String, JmxOperation> operationByName = mapOperations(
-					endpoints.get("test").getOperations());
+					endpoints.get(EndpointId.of("test")).getOperations());
 			assertThat(operationByName).containsOnlyKeys("getAll", "getSomething",
 					"update", "deleteSomething");
 			JmxOperation getAll = operationByName.get("getAll");
@@ -167,10 +169,11 @@ public class JmxEndpointDiscovererTests {
 	public void getEndpointsShouldCacheReadOperations() {
 		load(AdditionalOperationJmxEndpointConfiguration.class, (id) -> 500L,
 				(discoverer) -> {
-					Map<String, ExposableJmxEndpoint> endpoints = discover(discoverer);
-					assertThat(endpoints).containsOnlyKeys("test");
+					Map<EndpointId, ExposableJmxEndpoint> endpoints = discover(
+							discoverer);
+					assertThat(endpoints).containsOnlyKeys(EndpointId.of("test"));
 					Map<String, JmxOperation> operationByName = mapOperations(
-							endpoints.get("test").getOperations());
+							endpoints.get(EndpointId.of("test")).getOperations());
 					assertThat(operationByName).containsOnlyKeys("getAll", "getSomething",
 							"update", "deleteSomething", "getAnother");
 					JmxOperation getAll = operationByName.get("getAll");
@@ -285,10 +288,11 @@ public class JmxEndpointDiscovererTests {
 		assertThat(parameter.getType()).isEqualTo(type);
 	}
 
-	private Map<String, ExposableJmxEndpoint> discover(JmxEndpointDiscoverer discoverer) {
-		Map<String, ExposableJmxEndpoint> byId = new HashMap<>();
+	private Map<EndpointId, ExposableJmxEndpoint> discover(
+			JmxEndpointDiscoverer discoverer) {
+		Map<EndpointId, ExposableJmxEndpoint> byId = new HashMap<>();
 		discoverer.getEndpoints()
-				.forEach((endpoint) -> byId.put(endpoint.getId(), endpoint));
+				.forEach((endpoint) -> byId.put(endpoint.getEndpointId(), endpoint));
 		return byId;
 	}
 

spring-boot-project/spring-boot-actuator/src/test/java/org/springframework/boot/actuate/endpoint/web/EndpointLinksResolverTests.java

@@ -24,6 +24,7 @@ import java.util.Map;
 import org.assertj.core.api.Condition;
 import org.junit.Test;
 
+import org.springframework.boot.actuate.endpoint.EndpointId;
 import org.springframework.boot.actuate.endpoint.OperationType;
 import org.springframework.boot.actuate.endpoint.web.annotation.ExposableControllerEndpoint;
 
@@ -62,7 +63,7 @@ public class EndpointLinksResolverTests {
 		operations.add(operationWithPath("/alpha", "alpha"));
 		operations.add(operationWithPath("/alpha/{name}", "alpha-name"));
 		ExposableWebEndpoint endpoint = mock(ExposableWebEndpoint.class);
-		given(endpoint.getId()).willReturn("alpha");
+		given(endpoint.getEndpointId()).willReturn(EndpointId.of("alpha"));
 		given(endpoint.isEnableByDefault()).willReturn(true);
 		given(endpoint.getOperations()).willReturn(operations);
 		String requestUrl = "https://api.example.com/actuator";
@@ -80,7 +81,7 @@ public class EndpointLinksResolverTests {
 	@Test
 	public void resolvedLinksContainsALinkForServletEndpoint() {
 		ExposableServletEndpoint servletEndpoint = mock(ExposableServletEndpoint.class);
-		given(servletEndpoint.getId()).willReturn("alpha");
+		given(servletEndpoint.getEndpointId()).willReturn(EndpointId.of("alpha"));
 		given(servletEndpoint.isEnableByDefault()).willReturn(true);
 		given(servletEndpoint.getRootPath()).willReturn("alpha");
 		String requestUrl = "https://api.example.com/actuator";
@@ -97,7 +98,7 @@ public class EndpointLinksResolverTests {
 	public void resolvedLinksContainsALinkForControllerEndpoint() {
 		ExposableControllerEndpoint controllerEndpoint = mock(
 				ExposableControllerEndpoint.class);
-		given(controllerEndpoint.getId()).willReturn("alpha");
+		given(controllerEndpoint.getEndpointId()).willReturn(EndpointId.of("alpha"));
 		given(controllerEndpoint.isEnableByDefault()).willReturn(true);
 		given(controllerEndpoint.getRootPath()).willReturn("alpha");
 		String requestUrl = "https://api.example.com/actuator";

spring-boot-project/spring-boot-actuator/src/test/java/org/springframework/boot/actuate/endpoint/web/PathMappedEndpointsTests.java

@@ -24,6 +24,7 @@ import org.junit.Rule;
 import org.junit.Test;
 import org.junit.rules.ExpectedException;
 
+import org.springframework.boot.actuate.endpoint.EndpointId;
 import org.springframework.boot.actuate.endpoint.EndpointsSupplier;
 import org.springframework.boot.actuate.endpoint.ExposableEndpoint;
 import org.springframework.boot.actuate.endpoint.Operation;
@@ -60,38 +61,41 @@ public class PathMappedEndpointsTests {
 	public void iteratorShouldReturnPathMappedEndpoints() {
 		PathMappedEndpoints mapped = createTestMapped(null);
 		assertThat(mapped).hasSize(2);
-		assertThat(mapped).extracting("id").containsExactly("e2", "e3");
+		assertThat(mapped).extracting("endpointId").containsExactly(EndpointId.of("e2"),
+				EndpointId.of("e3"));
 	}
 
 	@Test
 	public void streamShouldReturnPathMappedEndpoints() {
 		PathMappedEndpoints mapped = createTestMapped(null);
 		assertThat(mapped.stream()).hasSize(2);
-		assertThat(mapped.stream()).extracting("id").containsExactly("e2", "e3");
+		assertThat(mapped.stream()).extracting("endpointId")
+				.containsExactly(EndpointId.of("e2"), EndpointId.of("e3"));
 	}
 
 	@Test
 	public void getRootPathWhenContainsIdShouldReturnRootPath() {
 		PathMappedEndpoints mapped = createTestMapped(null);
-		assertThat(mapped.getRootPath("e2")).isEqualTo("p2");
+		assertThat(mapped.getRootPath(EndpointId.of("e2"))).isEqualTo("p2");
 	}
 
 	@Test
 	public void getRootPathWhenMissingIdShouldReturnNull() {
 		PathMappedEndpoints mapped = createTestMapped(null);
-		assertThat(mapped.getRootPath("xx")).isNull();
+		assertThat(mapped.getRootPath(EndpointId.of("xx"))).isNull();
 	}
 
 	@Test
 	public void getPathWhenContainsIdShouldReturnRootPath() {
-		assertThat(createTestMapped(null).getPath("e2")).isEqualTo("/p2");
-		assertThat(createTestMapped("/x").getPath("e2")).isEqualTo("/x/p2");
+		assertThat(createTestMapped(null).getPath(EndpointId.of("e2"))).isEqualTo("/p2");
+		assertThat(createTestMapped("/x").getPath(EndpointId.of("e2")))
+				.isEqualTo("/x/p2");
 	}
 
 	@Test
 	public void getPathWhenMissingIdShouldReturnNull() {
 		PathMappedEndpoints mapped = createTestMapped(null);
-		assertThat(mapped.getPath("xx")).isNull();
+		assertThat(mapped.getPath(EndpointId.of("xx"))).isNull();
 	}
 
 	@Test
@@ -110,34 +114,34 @@ public class PathMappedEndpointsTests {
 	@Test
 	public void getEndpointWhenContainsIdShouldReturnPathMappedEndpoint() {
 		PathMappedEndpoints mapped = createTestMapped(null);
-		assertThat(mapped.getEndpoint("e2").getRootPath()).isEqualTo("p2");
+		assertThat(mapped.getEndpoint(EndpointId.of("e2")).getRootPath()).isEqualTo("p2");
 	}
 
 	@Test
 	public void getEndpointWhenMissingIdShouldReturnNull() {
 		PathMappedEndpoints mapped = createTestMapped(null);
-		assertThat(mapped.getEndpoint("xx")).isNull();
+		assertThat(mapped.getEndpoint(EndpointId.of("xx"))).isNull();
 	}
 
 	private PathMappedEndpoints createTestMapped(String basePath) {
 		List<ExposableEndpoint<?>> endpoints = new ArrayList<>();
-		endpoints.add(mockEndpoint("e1"));
-		endpoints.add(mockEndpoint("e2", "p2"));
-		endpoints.add(mockEndpoint("e3", "p3"));
-		endpoints.add(mockEndpoint("e4"));
+		endpoints.add(mockEndpoint(EndpointId.of("e1")));
+		endpoints.add(mockEndpoint(EndpointId.of("e2"), "p2"));
+		endpoints.add(mockEndpoint(EndpointId.of("e3"), "p3"));
+		endpoints.add(mockEndpoint(EndpointId.of("e4")));
 		return new PathMappedEndpoints(basePath, () -> endpoints);
 	}
 
-	private TestPathMappedEndpoint mockEndpoint(String id, String rootPath) {
+	private TestPathMappedEndpoint mockEndpoint(EndpointId id, String rootPath) {
 		TestPathMappedEndpoint endpoint = mock(TestPathMappedEndpoint.class);
-		given(endpoint.getId()).willReturn(id);
+		given(endpoint.getEndpointId()).willReturn(id);
 		given(endpoint.getRootPath()).willReturn(rootPath);
 		return endpoint;
 	}
 
-	private TestEndpoint mockEndpoint(String id) {
+	private TestEndpoint mockEndpoint(EndpointId id) {
 		TestEndpoint endpoint = mock(TestEndpoint.class);
-		given(endpoint.getId()).willReturn(id);
+		given(endpoint.getEndpointId()).willReturn(id);
 		return endpoint;
 	}
 

spring-boot-project/spring-boot-actuator/src/test/java/org/springframework/boot/actuate/endpoint/web/ServletEndpointRegistrarTests.java

@@ -35,6 +35,8 @@ import org.mockito.Captor;
 import org.mockito.Mock;
 import org.mockito.MockitoAnnotations;
 
+import org.springframework.boot.actuate.endpoint.EndpointId;
+
 import static org.assertj.core.api.Assertions.assertThat;
 import static org.mockito.ArgumentMatchers.any;
 import static org.mockito.ArgumentMatchers.eq;
@@ -124,7 +126,7 @@ public class ServletEndpointRegistrarTests {
 
 	private ExposableServletEndpoint mockEndpoint(EndpointServlet endpointServlet) {
 		ExposableServletEndpoint endpoint = mock(ExposableServletEndpoint.class);
-		given(endpoint.getId()).willReturn("test");
+		given(endpoint.getEndpointId()).willReturn(EndpointId.of("test"));
 		given(endpoint.getEndpointServlet()).willReturn(endpointServlet);
 		given(endpoint.getRootPath()).willReturn("test");
 		return endpoint;

spring-boot-project/spring-boot-actuator/src/test/java/org/springframework/boot/actuate/endpoint/web/annotation/ControllerEndpointDiscovererTests.java

@@ -26,6 +26,7 @@ import org.junit.Rule;
 import org.junit.Test;
 import org.junit.rules.ExpectedException;
 
+import org.springframework.boot.actuate.endpoint.EndpointId;
 import org.springframework.boot.actuate.endpoint.ExposableEndpoint;
 import org.springframework.boot.actuate.endpoint.annotation.DiscoveredEndpoint;
 import org.springframework.boot.actuate.endpoint.annotation.Endpoint;
@@ -70,7 +71,8 @@ public class ControllerEndpointDiscovererTests {
 							.getEndpoints();
 					assertThat(endpoints).hasSize(1);
 					ExposableControllerEndpoint endpoint = endpoints.iterator().next();
-					assertThat(endpoint.getId()).isEqualTo("testcontroller");
+					assertThat(endpoint.getEndpointId())
+							.isEqualTo(EndpointId.of("testcontroller"));
 					assertThat(endpoint.getController())
 							.isInstanceOf(TestControllerEndpoint.class);
 					assertThat(endpoint).isInstanceOf(DiscoveredEndpoint.class);
@@ -87,7 +89,8 @@ public class ControllerEndpointDiscovererTests {
 							.getEndpoints();
 					assertThat(endpoints).hasSize(1);
 					ExposableControllerEndpoint endpoint = endpoints.iterator().next();
-					assertThat(endpoint.getId()).isEqualTo("testcontroller");
+					assertThat(endpoint.getEndpointId())
+							.isEqualTo(EndpointId.of("testcontroller"));
 					assertThat(endpoint.getController())
 							.isInstanceOf(TestProxyControllerEndpoint.class);
 					assertThat(endpoint).isInstanceOf(DiscoveredEndpoint.class);
@@ -102,7 +105,8 @@ public class ControllerEndpointDiscovererTests {
 							.getEndpoints();
 					assertThat(endpoints).hasSize(1);
 					ExposableControllerEndpoint endpoint = endpoints.iterator().next();
-					assertThat(endpoint.getId()).isEqualTo("testrestcontroller");
+					assertThat(endpoint.getEndpointId())
+							.isEqualTo(EndpointId.of("testrestcontroller"));
 					assertThat(endpoint.getController())
 							.isInstanceOf(TestRestControllerEndpoint.class);
 				}));
@@ -118,7 +122,8 @@ public class ControllerEndpointDiscovererTests {
 							.getEndpoints();
 					assertThat(endpoints).hasSize(1);
 					ExposableControllerEndpoint endpoint = endpoints.iterator().next();
-					assertThat(endpoint.getId()).isEqualTo("testrestcontroller");
+					assertThat(endpoint.getEndpointId())
+							.isEqualTo(EndpointId.of("testrestcontroller"));
 					assertThat(endpoint.getController())
 							.isInstanceOf(TestProxyRestControllerEndpoint.class);
 					assertThat(endpoint).isInstanceOf(DiscoveredEndpoint.class);
@@ -131,9 +136,11 @@ public class ControllerEndpointDiscovererTests {
 				.run(assertDiscoverer((discoverer) -> {
 					Collection<ExposableControllerEndpoint> endpoints = discoverer
 							.getEndpoints();
-					List<String> ids = endpoints.stream().map(ExposableEndpoint::getId)
+					List<EndpointId> ids = endpoints.stream()
+							.map(ExposableEndpoint::getEndpointId)
 							.collect(Collectors.toList());
-					assertThat(ids).containsOnly("testcontroller", "testrestcontroller");
+					assertThat(ids).containsOnly(EndpointId.of("testcontroller"),
+							EndpointId.of("testrestcontroller"));
 				}));
 	}
 

spring-boot-project/spring-boot-actuator/src/test/java/org/springframework/boot/actuate/endpoint/web/annotation/ServletEndpointDiscovererTests.java

@@ -33,6 +33,7 @@ import org.junit.Rule;
 import org.junit.Test;
 import org.junit.rules.ExpectedException;
 
+import org.springframework.boot.actuate.endpoint.EndpointId;
 import org.springframework.boot.actuate.endpoint.ExposableEndpoint;
 import org.springframework.boot.actuate.endpoint.annotation.DiscoveredEndpoint;
 import org.springframework.boot.actuate.endpoint.annotation.Endpoint;
@@ -79,7 +80,8 @@ public class ServletEndpointDiscovererTests {
 							.getEndpoints();
 					assertThat(endpoints).hasSize(1);
 					ExposableServletEndpoint endpoint = endpoints.iterator().next();
-					assertThat(endpoint.getId()).isEqualTo("testservlet");
+					assertThat(endpoint.getEndpointId())
+							.isEqualTo(EndpointId.of("testservlet"));
 					assertThat(endpoint.getEndpointServlet()).isNotNull();
 					assertThat(endpoint).isInstanceOf(DiscoveredEndpoint.class);
 				}));
@@ -95,7 +97,8 @@ public class ServletEndpointDiscovererTests {
 							.getEndpoints();
 					assertThat(endpoints).hasSize(1);
 					ExposableServletEndpoint endpoint = endpoints.iterator().next();
-					assertThat(endpoint.getId()).isEqualTo("testservlet");
+					assertThat(endpoint.getEndpointId())
+							.isEqualTo(EndpointId.of("testservlet"));
 					assertThat(endpoint.getEndpointServlet()).isNotNull();
 					assertThat(endpoint).isInstanceOf(DiscoveredEndpoint.class);
 				}));
@@ -107,9 +110,10 @@ public class ServletEndpointDiscovererTests {
 				.run(assertDiscoverer((discoverer) -> {
 					Collection<ExposableServletEndpoint> endpoints = discoverer
 							.getEndpoints();
-					List<String> ids = endpoints.stream().map(ExposableEndpoint::getId)
+					List<EndpointId> ids = endpoints.stream()
+							.map(ExposableEndpoint::getEndpointId)
 							.collect(Collectors.toList());
-					assertThat(ids).containsOnly("testservlet");
+					assertThat(ids).containsOnly(EndpointId.of("testservlet"));
 				}));
 	}
 

spring-boot-project/spring-boot-actuator/src/test/java/org/springframework/boot/actuate/endpoint/web/annotation/WebEndpointDiscovererTests.java

@@ -33,6 +33,7 @@ import org.junit.Rule;
 import org.junit.Test;
 import org.junit.rules.ExpectedException;
 
+import org.springframework.boot.actuate.endpoint.EndpointId;
 import org.springframework.boot.actuate.endpoint.annotation.DeleteOperation;
 import org.springframework.boot.actuate.endpoint.annotation.Endpoint;
 import org.springframework.boot.actuate.endpoint.annotation.ReadOperation;
@@ -91,19 +92,19 @@ public class WebEndpointDiscovererTests {
 	@Test
 	public void getEndpointsWhenHasFilteredEndpointShouldOnlyDiscoverWebEndpoints() {
 		load(MultipleEndpointsConfiguration.class, (discoverer) -> {
-			Map<String, ExposableWebEndpoint> endpoints = mapEndpoints(
+			Map<EndpointId, ExposableWebEndpoint> endpoints = mapEndpoints(
 					discoverer.getEndpoints());
-			assertThat(endpoints).containsOnlyKeys("test");
+			assertThat(endpoints).containsOnlyKeys(EndpointId.of("test"));
 		});
 	}
 
 	@Test
 	public void getEndpointsWhenHasWebExtensionShouldOverrideStandardEndpoint() {
 		load(OverriddenOperationWebEndpointExtensionConfiguration.class, (discoverer) -> {
-			Map<String, ExposableWebEndpoint> endpoints = mapEndpoints(
+			Map<EndpointId, ExposableWebEndpoint> endpoints = mapEndpoints(
 					discoverer.getEndpoints());
-			assertThat(endpoints).containsOnlyKeys("test");
-			ExposableWebEndpoint endpoint = endpoints.get("test");
+			assertThat(endpoints).containsOnlyKeys(EndpointId.of("test"));
+			ExposableWebEndpoint endpoint = endpoints.get(EndpointId.of("test"));
 			assertThat(requestPredicates(endpoint)).has(
 					requestPredicates(path("test").httpMethod(WebEndpointHttpMethod.GET)
 							.consumes().produces("application/json")));
@@ -113,10 +114,10 @@ public class WebEndpointDiscovererTests {
 	@Test
 	public void getEndpointsWhenExtensionAddsOperationShouldHaveBothOperations() {
 		load(AdditionalOperationWebEndpointConfiguration.class, (discoverer) -> {
-			Map<String, ExposableWebEndpoint> endpoints = mapEndpoints(
+			Map<EndpointId, ExposableWebEndpoint> endpoints = mapEndpoints(
 					discoverer.getEndpoints());
-			assertThat(endpoints).containsOnlyKeys("test");
-			ExposableWebEndpoint endpoint = endpoints.get("test");
+			assertThat(endpoints).containsOnlyKeys(EndpointId.of("test"));
+			ExposableWebEndpoint endpoint = endpoints.get(EndpointId.of("test"));
 			assertThat(requestPredicates(endpoint)).has(requestPredicates(
 					path("test").httpMethod(WebEndpointHttpMethod.GET).consumes()
 							.produces("application/json"),
@@ -128,10 +129,10 @@ public class WebEndpointDiscovererTests {
 	@Test
 	public void getEndpointsWhenPredicateForWriteOperationThatReturnsVoidShouldHaveNoProducedMediaTypes() {
 		load(VoidWriteOperationEndpointConfiguration.class, (discoverer) -> {
-			Map<String, ExposableWebEndpoint> endpoints = mapEndpoints(
+			Map<EndpointId, ExposableWebEndpoint> endpoints = mapEndpoints(
 					discoverer.getEndpoints());
-			assertThat(endpoints).containsOnlyKeys("voidwrite");
-			ExposableWebEndpoint endpoint = endpoints.get("voidwrite");
+			assertThat(endpoints).containsOnlyKeys(EndpointId.of("voidwrite"));
+			ExposableWebEndpoint endpoint = endpoints.get(EndpointId.of("voidwrite"));
 			assertThat(requestPredicates(endpoint)).has(requestPredicates(
 					path("voidwrite").httpMethod(WebEndpointHttpMethod.POST).produces()
 							.consumes("application/json")));
@@ -191,10 +192,10 @@ public class WebEndpointDiscovererTests {
 	@Test
 	public void getEndpointsWhenHasCacheWithTtlShouldCacheReadOperationWithTtlValue() {
 		load((id) -> 500L, (id) -> id, TestEndpointConfiguration.class, (discoverer) -> {
-			Map<String, ExposableWebEndpoint> endpoints = mapEndpoints(
+			Map<EndpointId, ExposableWebEndpoint> endpoints = mapEndpoints(
 					discoverer.getEndpoints());
-			assertThat(endpoints).containsOnlyKeys("test");
-			ExposableWebEndpoint endpoint = endpoints.get("test");
+			assertThat(endpoints).containsOnlyKeys(EndpointId.of("test"));
+			ExposableWebEndpoint endpoint = endpoints.get(EndpointId.of("test"));
 			assertThat(endpoint.getOperations()).hasSize(1);
 			WebOperation operation = endpoint.getOperations().iterator().next();
 			Object invoker = ReflectionTestUtils.getField(operation, "invoker");
@@ -207,10 +208,10 @@ public class WebEndpointDiscovererTests {
 	@Test
 	public void getEndpointsWhenOperationReturnsResourceShouldProduceApplicationOctetStream() {
 		load(ResourceEndpointConfiguration.class, (discoverer) -> {
-			Map<String, ExposableWebEndpoint> endpoints = mapEndpoints(
+			Map<EndpointId, ExposableWebEndpoint> endpoints = mapEndpoints(
 					discoverer.getEndpoints());
-			assertThat(endpoints).containsOnlyKeys("resource");
-			ExposableWebEndpoint endpoint = endpoints.get("resource");
+			assertThat(endpoints).containsOnlyKeys(EndpointId.of("resource"));
+			ExposableWebEndpoint endpoint = endpoints.get(EndpointId.of("resource"));
 			assertThat(requestPredicates(endpoint)).has(requestPredicates(
 					path("resource").httpMethod(WebEndpointHttpMethod.GET).consumes()
 							.produces("application/octet-stream")));
@@ -220,10 +221,11 @@ public class WebEndpointDiscovererTests {
 	@Test
 	public void getEndpointsWhenHasCustomMediaTypeShouldProduceCustomMediaType() {
 		load(CustomMediaTypesEndpointConfiguration.class, (discoverer) -> {
-			Map<String, ExposableWebEndpoint> endpoints = mapEndpoints(
+			Map<EndpointId, ExposableWebEndpoint> endpoints = mapEndpoints(
 					discoverer.getEndpoints());
-			assertThat(endpoints).containsOnlyKeys("custommediatypes");
-			ExposableWebEndpoint endpoint = endpoints.get("custommediatypes");
+			assertThat(endpoints).containsOnlyKeys(EndpointId.of("custommediatypes"));
+			ExposableWebEndpoint endpoint = endpoints
+					.get(EndpointId.of("custommediatypes"));
 			assertThat(requestPredicates(endpoint)).has(requestPredicates(
 					path("custommediatypes").httpMethod(WebEndpointHttpMethod.GET)
 							.consumes().produces("text/plain"),
@@ -238,10 +240,10 @@ public class WebEndpointDiscovererTests {
 	public void getEndpointsWhenHasCustomPathShouldReturnCustomPath() {
 		load((id) -> null, (id) -> "custom/" + id,
 				AdditionalOperationWebEndpointConfiguration.class, (discoverer) -> {
-					Map<String, ExposableWebEndpoint> endpoints = mapEndpoints(
+					Map<EndpointId, ExposableWebEndpoint> endpoints = mapEndpoints(
 							discoverer.getEndpoints());
-					assertThat(endpoints).containsOnlyKeys("test");
-					ExposableWebEndpoint endpoint = endpoints.get("test");
+					assertThat(endpoints).containsOnlyKeys(EndpointId.of("test"));
+					ExposableWebEndpoint endpoint = endpoints.get(EndpointId.of("test"));
 					Condition<List<? extends WebOperationRequestPredicate>> expected = requestPredicates(
 							path("custom/test").httpMethod(WebEndpointHttpMethod.GET)
 									.consumes().produces("application/json"),
@@ -276,10 +278,11 @@ public class WebEndpointDiscovererTests {
 		}
 	}
 
-	private Map<String, ExposableWebEndpoint> mapEndpoints(
+	private Map<EndpointId, ExposableWebEndpoint> mapEndpoints(
 			Collection<ExposableWebEndpoint> endpoints) {
-		Map<String, ExposableWebEndpoint> endpointById = new HashMap<>();
-		endpoints.forEach((endpoint) -> endpointById.put(endpoint.getId(), endpoint));
+		Map<EndpointId, ExposableWebEndpoint> endpointById = new HashMap<>();
+		endpoints.forEach(
+				(endpoint) -> endpointById.put(endpoint.getEndpointId(), endpoint));
 		return endpointById;
 	}
 

spring-boot-project/spring-boot-actuator/src/test/java/org/springframework/boot/actuate/endpoint/web/reactive/ControllerEndpointHandlerMappingTests.java

@@ -22,6 +22,7 @@ import org.junit.Rule;
 import org.junit.Test;
 import org.junit.rules.ExpectedException;
 
+import org.springframework.boot.actuate.endpoint.EndpointId;
 import org.springframework.boot.actuate.endpoint.web.EndpointMapping;
 import org.springframework.boot.actuate.endpoint.web.annotation.ControllerEndpoint;
 import org.springframework.boot.actuate.endpoint.web.annotation.ExposableControllerEndpoint;
@@ -121,22 +122,22 @@ public class ControllerEndpointHandlerMappingTests {
 	}
 
 	private ExposableControllerEndpoint firstEndpoint() {
-		return mockEndpoint("first", new FirstTestMvcEndpoint());
+		return mockEndpoint(EndpointId.of("first"), new FirstTestMvcEndpoint());
 	}
 
 	private ExposableControllerEndpoint secondEndpoint() {
-		return mockEndpoint("second", new SecondTestMvcEndpoint());
+		return mockEndpoint(EndpointId.of("second"), new SecondTestMvcEndpoint());
 	}
 
 	private ExposableControllerEndpoint pathlessEndpoint() {
-		return mockEndpoint("pathless", new PathlessControllerEndpoint());
+		return mockEndpoint(EndpointId.of("pathless"), new PathlessControllerEndpoint());
 	}
 
-	private ExposableControllerEndpoint mockEndpoint(String id, Object controller) {
+	private ExposableControllerEndpoint mockEndpoint(EndpointId id, Object controller) {
 		ExposableControllerEndpoint endpoint = mock(ExposableControllerEndpoint.class);
-		given(endpoint.getId()).willReturn(id);
+		given(endpoint.getEndpointId()).willReturn(id);
 		given(endpoint.getController()).willReturn(controller);
-		given(endpoint.getRootPath()).willReturn(id);
+		given(endpoint.getRootPath()).willReturn(id.toString());
 		return endpoint;
 	}
 

spring-boot-project/spring-boot-actuator/src/test/java/org/springframework/boot/actuate/endpoint/web/servlet/ControllerEndpointHandlerMappingTests.java

@@ -22,6 +22,7 @@ import org.junit.Rule;
 import org.junit.Test;
 import org.junit.rules.ExpectedException;
 
+import org.springframework.boot.actuate.endpoint.EndpointId;
 import org.springframework.boot.actuate.endpoint.web.EndpointMapping;
 import org.springframework.boot.actuate.endpoint.web.annotation.ControllerEndpoint;
 import org.springframework.boot.actuate.endpoint.web.annotation.ExposableControllerEndpoint;
@@ -113,22 +114,22 @@ public class ControllerEndpointHandlerMappingTests {
 	}
 
 	private ExposableControllerEndpoint firstEndpoint() {
-		return mockEndpoint("first", new FirstTestMvcEndpoint());
+		return mockEndpoint(EndpointId.of("first"), new FirstTestMvcEndpoint());
 	}
 
 	private ExposableControllerEndpoint secondEndpoint() {
-		return mockEndpoint("second", new SecondTestMvcEndpoint());
+		return mockEndpoint(EndpointId.of("second"), new SecondTestMvcEndpoint());
 	}
 
 	private ExposableControllerEndpoint pathlessEndpoint() {
-		return mockEndpoint("pathless", new PathlessControllerEndpoint());
+		return mockEndpoint(EndpointId.of("pathless"), new PathlessControllerEndpoint());
 	}
 
-	private ExposableControllerEndpoint mockEndpoint(String id, Object controller) {
+	private ExposableControllerEndpoint mockEndpoint(EndpointId id, Object controller) {
 		ExposableControllerEndpoint endpoint = mock(ExposableControllerEndpoint.class);
-		given(endpoint.getId()).willReturn(id);
+		given(endpoint.getEndpointId()).willReturn(id);
 		given(endpoint.getController()).willReturn(controller);
-		given(endpoint.getRootPath()).willReturn(id);
+		given(endpoint.getRootPath()).willReturn(id.toString());
 		return endpoint;
 	}