Ensure that containers' static resource handling not MVC's is used

Closes gh-25949

spring-boot-tests/spring-boot-integration-tests/spring-boot-server-tests/build.gradle

@@ -11,7 +11,6 @@ configurations {
 
 dependencies {
 	testImplementation(project(":spring-boot-project:spring-boot-starters:spring-boot-starter-test"))
-	testImplementation(project(":spring-boot-project:spring-boot-actuator-autoconfigure"))
 	testImplementation(project(":spring-boot-project:spring-boot-tools:spring-boot-test-support"))
 	testImplementation("com.samskivert:jmustache")
 	testImplementation("jakarta.servlet:jakarta.servlet-api")
@@ -26,7 +25,6 @@ dependencies {
 	testRepository(project(path: ":spring-boot-project:spring-boot-dependencies", configuration: "mavenRepository"))
 	testRepository(project(path: ":spring-boot-project:spring-boot-tools:spring-boot-maven-plugin", configuration: "mavenRepository"))
 	testRepository(project(path: ":spring-boot-project:spring-boot-starters:spring-boot-starter", configuration: "mavenRepository"))
-	testRepository(project(path: ":spring-boot-project:spring-boot-starters:spring-boot-starter-actuator", configuration: "mavenRepository"))
 	testRepository(project(path: ":spring-boot-project:spring-boot-starters:spring-boot-starter-jetty", configuration: "mavenRepository"))
 	testRepository(project(path: ":spring-boot-project:spring-boot-starters:spring-boot-starter-json", configuration: "mavenRepository"))
 	testRepository(project(path: ":spring-boot-project:spring-boot-starters:spring-boot-starter-parent", configuration: "mavenRepository"))

spring-boot-tests/spring-boot-integration-tests/spring-boot-server-tests/src/test/java/com/autoconfig/ExampleAutoConfiguration.java

 /*
- * Copyright 2012-2020 the original author or authors.
+ * Copyright 2012-2021 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.
@@ -16,27 +16,44 @@
 
 package com.autoconfig;
 
-import org.springframework.boot.actuate.endpoint.annotation.Endpoint;
-import org.springframework.boot.actuate.endpoint.annotation.ReadOperation;
+import java.io.IOException;
+
+import javax.servlet.ServletException;
+import javax.servlet.http.HttpServlet;
+import javax.servlet.http.HttpServletRequest;
+import javax.servlet.http.HttpServletResponse;
+
 import org.springframework.boot.autoconfigure.condition.ConditionalOnWarDeployment;
+import org.springframework.boot.web.servlet.ServletRegistrationBean;
 import org.springframework.context.annotation.Bean;
 import org.springframework.context.annotation.Configuration;
+import org.springframework.http.MediaType;
 
-@ConditionalOnWarDeployment
 @Configuration
 public class ExampleAutoConfiguration {
 
 	@Bean
-	public TestEndpoint testEndpoint() {
-		return new TestEndpoint();
+	@ConditionalOnWarDeployment
+	public ServletRegistrationBean<TestServlet> onWarTestServlet() {
+		ServletRegistrationBean<TestServlet> registration = new ServletRegistrationBean<>(new TestServlet());
+		registration.addUrlMappings("/conditionalOnWar");
+		return registration;
+	}
+
+	@Bean
+	public ServletRegistrationBean<TestServlet> testServlet() {
+		ServletRegistrationBean<TestServlet> registration = new ServletRegistrationBean<>(new TestServlet());
+		registration.addUrlMappings("/always");
+		return registration;
 	}
 
-	@Endpoint(id = "war")
-	static class TestEndpoint {
+	static class TestServlet extends HttpServlet {
 
-		@ReadOperation
-		String hello() {
-			return "{\"hello\":\"world\"}";
+		@Override
+		protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
+			resp.setContentType(MediaType.APPLICATION_JSON_VALUE);
+			resp.getWriter().println("{\"hello\":\"world\"}");
+			resp.flushBuffer();
 		}
 
 	}

spring-boot-tests/spring-boot-integration-tests/spring-boot-server-tests/src/test/java/com/example/ResourceHandlingApplication.java

@@ -56,8 +56,16 @@ public class ResourceHandlingApplication {
 	}
 
 	public static void main(String[] args) {
-		new SpringApplicationBuilder(ResourceHandlingApplication.class).properties("server.port:0")
-				.listeners(new WebServerPortFileWriter(args[0])).run(args);
+		try {
+			Class.forName("org.springframework.web.servlet.DispatcherServlet");
+			System.err.println("Spring MVC must not be present, otherwise its static resource handling "
+					+ "will be used rather than the embedded containers'");
+			System.exit(1);
+		}
+		catch (Throwable ex) {
+			new SpringApplicationBuilder(ResourceHandlingApplication.class).properties("server.port:0")
+					.listeners(new WebServerPortFileWriter(args[0])).run(args);
+		}
 	}
 
 	private static final class GetResourcePathsServlet extends HttpServlet {

spring-boot-tests/spring-boot-integration-tests/spring-boot-server-tests/src/test/java/org/springframework/boot/context/embedded/ApplicationBuilder.java

 /*
- * Copyright 2012-2020 the original author or authors.
+ * Copyright 2012-2021 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.
@@ -161,8 +161,6 @@ class ApplicationBuilder {
 		metaInf.mkdirs();
 		FileCopyUtils.copy(new File("src/test/resources/META-INF/spring.factories"),
 				new File(metaInf, "spring.factories"));
-		FileCopyUtils.copy(new File("src/test/resources/application.yml"),
-				new File(srcMainResources, "application.yml"));
 	}
 
 	private void packageApplication(File appDirectory, File settingsXml) throws MavenInvocationException {

spring-boot-tests/spring-boot-integration-tests/spring-boot-server-tests/src/test/java/org/springframework/boot/context/embedded/EmbeddedServletContainerJarPackagingIntegrationTests.java

 /*
- * Copyright 2012-2020 the original author or authors.
+ * Copyright 2012-2021 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.
@@ -81,7 +81,7 @@ class EmbeddedServletContainerJarPackagingIntegrationTests {
 
 	@TestTemplate
 	void conditionalOnWarDeploymentBeanIsNotAvailableForEmbeddedServer(RestTemplate rest) {
-		ResponseEntity<String> entity = rest.getForEntity("/actuator/war", String.class);
+		ResponseEntity<String> entity = rest.getForEntity("/war", String.class);
 		assertThat(entity.getStatusCode()).isEqualTo(HttpStatus.NOT_FOUND);
 	}
 

spring-boot-tests/spring-boot-integration-tests/spring-boot-server-tests/src/test/java/org/springframework/boot/context/embedded/EmbeddedServletContainerWarPackagingIntegrationTests.java

 /*
- * Copyright 2012-2020 the original author or authors.
+ * Copyright 2012-2021 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.
@@ -104,8 +104,9 @@ class EmbeddedServletContainerWarPackagingIntegrationTests {
 
 	@TestTemplate
 	void conditionalOnWarDeploymentBeanIsNotAvailableForEmbeddedServer(RestTemplate rest) {
-		ResponseEntity<String> entity = rest.getForEntity("/actuator/war", String.class);
-		assertThat(entity.getStatusCode()).isEqualTo(HttpStatus.NOT_FOUND);
+		assertThat(rest.getForEntity("/always", String.class).getStatusCode()).isEqualTo(HttpStatus.OK);
+		assertThat(rest.getForEntity("/conditionalOnWar", String.class).getStatusCode())
+				.isEqualTo(HttpStatus.NOT_FOUND);
 	}
 
 	private List<String> readLines(String input) {

spring-boot-tests/spring-boot-integration-tests/spring-boot-server-tests/src/test/resources/application.yml

-management.endpoints.web.exposure.include: '*'

spring-boot-tests/spring-boot-integration-tests/spring-boot-server-tests/src/test/resources/pom-template.xml

@@ -18,11 +18,7 @@
 	<dependencies>
 		<dependency>
 			<groupId>org.springframework.boot</groupId>
-			<artifactId>spring-boot-starter-json</artifactId>
-		</dependency>
-		<dependency>
-			<groupId>org.springframework.boot</groupId>
-			<artifactId>spring-boot-starter-actuator</artifactId>
+			<artifactId>spring-boot-starter</artifactId>
 		</dependency>
 		<dependency>
 			<groupId>org.springframework.boot</groupId>
@@ -30,7 +26,7 @@
 		</dependency>
 		<dependency>
 			<groupId>org.springframework</groupId>
-			<artifactId>spring-webmvc</artifactId>
+			<artifactId>spring-web</artifactId>
 		</dependency>
 		<dependency>
 			<groupId>javax.servlet</groupId>