Remove JSR-330 configuration annotations

Replace JSR-330 validation annotations from all internal
`@ConfigurationProperties` classes with standard Asserts.

Prior to this commit validation of our own configuration properties
would only occur when the user happens to have compliant JSR-330
implementation on their classpath.

See gh-7579

spring-boot-actuator/src/main/java/org/springframework/boot/actuate/autoconfigure/ManagementServerProperties.java

@@ -20,8 +20,8 @@ import java.net.InetAddress;
 import java.util.Arrays;
 import java.util.List;
 
+import javax.annotation.PostConstruct;
 import javax.servlet.http.HttpSession;
-import javax.validation.constraints.NotNull;
 
 import org.springframework.boot.autoconfigure.security.SecurityPrerequisite;
 import org.springframework.boot.autoconfigure.security.SecurityProperties;
@@ -29,6 +29,7 @@ import org.springframework.boot.autoconfigure.web.ServerProperties;
 import org.springframework.boot.context.embedded.Ssl;
 import org.springframework.boot.context.properties.ConfigurationProperties;
 import org.springframework.boot.context.properties.NestedConfigurationProperty;
+import org.springframework.util.Assert;
 import org.springframework.util.StringUtils;
 
 /**
@@ -78,7 +79,6 @@ public class ManagementServerProperties implements SecurityPrerequisite {
 	/**
 	 * Management endpoint context-path.
 	 */
-	@NotNull
 	private String contextPath = "";
 
 	/**
@@ -88,6 +88,11 @@ public class ManagementServerProperties implements SecurityPrerequisite {
 
 	private final Security security = new Security();
 
+	@PostConstruct
+	private void validate() {
+		Assert.notNull(this.contextPath, "ContextPath must not be null");
+	}
+
 	/**
 	 * Returns the management port or {@code null} if the
 	 * {@link ServerProperties#getPort() server port} should be used.

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

@@ -16,11 +16,13 @@
 
 package org.springframework.boot.actuate.endpoint;
 
-import javax.validation.constraints.NotNull;
-import javax.validation.constraints.Pattern;
+import java.util.regex.Pattern;
+
+import javax.annotation.PostConstruct;
 
 import org.springframework.context.EnvironmentAware;
 import org.springframework.core.env.Environment;
+import org.springframework.util.Assert;
 
 /**
  * Abstract base for {@link Endpoint} implementations.
@@ -31,14 +33,14 @@ import org.springframework.core.env.Environment;
  */
 public abstract class AbstractEndpoint<T> implements Endpoint<T>, EnvironmentAware {
 
+	private static final Pattern ID_PATTERN = Pattern.compile("\\w+");
+
 	private Environment environment;
 
 	/**
 	 * Endpoint identifier. With HTTP monitoring the identifier of the endpoint is mapped
 	 * to a URL (e.g. 'foo' is mapped to '/foo').
 	 */
-	@NotNull
-	@Pattern(regexp = "\\w+", message = "ID must only contains letters, numbers and '_'")
 	private String id;
 
 	private final boolean sensitiveDefault;
@@ -53,6 +55,13 @@ public abstract class AbstractEndpoint<T> implements Endpoint<T>, EnvironmentAwa
 	 */
 	private Boolean enabled;
 
+	@PostConstruct
+	private void validate() {
+		Assert.notNull(this.id, "Id must not be null");
+		Assert.isTrue(ID_PATTERN.matcher(this.id).matches(),
+				"ID must only contains letters, numbers and '_'");
+	}
+
 	/**
 	 * Create a new sensitive endpoint instance. The endpoint will enabled flag will be
 	 * based on the spring {@link Environment} unless explicitly set.

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

@@ -62,9 +62,11 @@ public class LiquibaseEndpoint extends AbstractEndpoint<List<LiquibaseReport>> {
 		for (Map.Entry<String, SpringLiquibase> entry : this.liquibases.entrySet()) {
 			try {
 				DataSource dataSource = entry.getValue().getDataSource();
-				JdbcConnection connection = new JdbcConnection(dataSource.getConnection());
+				JdbcConnection connection = new JdbcConnection(
+						dataSource.getConnection());
 				try {
-					Database database = factory.findCorrectDatabaseImplementation(connection);
+					Database database = factory
+							.findCorrectDatabaseImplementation(connection);
 					reports.add(new LiquibaseReport(entry.getKey(),
 							service.queryDatabaseChangeLogTable(database)));
 				}

spring-boot-actuator/src/main/java/org/springframework/boot/actuate/endpoint/mvc/AbstractMvcEndpoint.java

@@ -16,13 +16,13 @@
 
 package org.springframework.boot.actuate.endpoint.mvc;
 
-import javax.validation.constraints.NotNull;
-import javax.validation.constraints.Pattern;
+import javax.annotation.PostConstruct;
 
 import org.springframework.boot.actuate.endpoint.Endpoint;
 import org.springframework.boot.actuate.endpoint.EndpointProperties;
 import org.springframework.context.EnvironmentAware;
 import org.springframework.core.env.Environment;
+import org.springframework.util.Assert;
 import org.springframework.web.servlet.config.annotation.WebMvcConfigurerAdapter;
 
 /**
@@ -41,8 +41,6 @@ public abstract class AbstractMvcEndpoint extends WebMvcConfigurerAdapter
 	/**
 	 * Endpoint URL path.
 	 */
-	@NotNull
-	@Pattern(regexp = "/.*|^$", message = "Path must start with / or be empty")
 	private String path;
 
 	/**
@@ -68,6 +66,13 @@ public abstract class AbstractMvcEndpoint extends WebMvcConfigurerAdapter
 		this.enabled = enabled;
 	}
 
+	@PostConstruct
+	private void validate() {
+		Assert.notNull(this.path, "Path must not be null");
+		Assert.isTrue(this.path.length() == 0 || this.path.startsWith("/"),
+				"Path must start with / or be empty");
+	}
+
 	@Override
 	public void setEnvironment(Environment environment) {
 		this.environment = environment;