Add @DirtiesUrlFactories annotation

Add `@DirtiesUrlFactories` annotation that can be used to reset URL
factories.

Closes gh-33017

Author: philwebb

spring-boot-project/spring-boot-tools/spring-boot-test-support/src/main/java/org/springframework/boot/testsupport/web/servlet/DirtiesUrlFactories.java

@@ -0,0 +1,39 @@
+/*
+ * Copyright 2012-2022 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
+ *
+ *      https://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.testsupport.web.servlet;
+
+import java.lang.annotation.Documented;
+import java.lang.annotation.ElementType;
+import java.lang.annotation.Retention;
+import java.lang.annotation.RetentionPolicy;
+import java.lang.annotation.Target;
+
+import org.junit.jupiter.api.extension.ExtendWith;
+
+/**
+ * Indicates that a test pollutes URL factories.
+ *
+ * @author Phillip Webb
+ * @since 2.6.14
+ */
+@Retention(RetentionPolicy.RUNTIME)
+@Target({ ElementType.TYPE, ElementType.METHOD })
+@Documented
+@ExtendWith(DirtiesUrlFactoriesExtension.class)
+public @interface DirtiesUrlFactories {
+
+}

spring-boot-project/spring-boot-tools/spring-boot-test-support/src/main/java/org/springframework/boot/testsupport/web/servlet/DirtiesUrlFactoriesExtension.java

@@ -0,0 +1,56 @@
+/*
+ * Copyright 2012-2022 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
+ *
+ *      https://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.testsupport.web.servlet;
+
+import java.net.URL;
+
+import org.junit.jupiter.api.extension.AfterEachCallback;
+import org.junit.jupiter.api.extension.BeforeEachCallback;
+import org.junit.jupiter.api.extension.ExtensionContext;
+
+import org.springframework.test.util.ReflectionTestUtils;
+import org.springframework.util.ClassUtils;
+
+/**
+ * JUnit extension used by {@link DirtiesUrlFactories @DirtiesUrlFactories}.
+ *
+ * @author Phillip Webb
+ */
+class DirtiesUrlFactoriesExtension implements BeforeEachCallback, AfterEachCallback {
+
+	private static final String TOMCAT_URL_STREAM_HANDLER_FACTORY = "org.apache.catalina.webresources.TomcatURLStreamHandlerFactory";
+
+	@Override
+	public void afterEach(ExtensionContext context) throws Exception {
+		reset();
+	}
+
+	@Override
+	public void beforeEach(ExtensionContext context) throws Exception {
+		reset();
+	}
+
+	private void reset() {
+		ClassLoader classLoader = getClass().getClassLoader();
+		if (ClassUtils.isPresent(TOMCAT_URL_STREAM_HANDLER_FACTORY, classLoader)) {
+			Class<?> factoryClass = ClassUtils.resolveClassName(TOMCAT_URL_STREAM_HANDLER_FACTORY, classLoader);
+			ReflectionTestUtils.setField(factoryClass, "instance", null);
+		}
+		ReflectionTestUtils.setField(URL.class, "factory", null);
+	}
+
+}

spring-boot-project/spring-boot/src/test/java/org/springframework/boot/web/embedded/tomcat/SslConnectorCustomizerTests.java

@@ -18,7 +18,6 @@
 
 import java.io.IOException;
 import java.io.InputStream;
-import java.net.URL;
 import java.security.KeyStore;
 import java.security.KeyStoreException;
 import java.security.NoSuchAlgorithmException;
@@ -27,7 +26,6 @@
 import org.apache.catalina.LifecycleState;
 import org.apache.catalina.connector.Connector;
 import org.apache.catalina.startup.Tomcat;
-import org.apache.catalina.webresources.TomcatURLStreamHandlerFactory;
 import org.apache.coyote.http11.Http11NioProtocol;
 import org.apache.tomcat.util.net.SSLHostConfig;
 import org.junit.jupiter.api.AfterEach;
@@ -37,12 +35,12 @@
 
 import org.springframework.boot.testsupport.system.CapturedOutput;
 import org.springframework.boot.testsupport.system.OutputCaptureExtension;
+import org.springframework.boot.testsupport.web.servlet.DirtiesUrlFactories;
 import org.springframework.boot.web.server.Ssl;
 import org.springframework.boot.web.server.SslStoreProvider;
 import org.springframework.boot.web.server.WebServerException;
 import org.springframework.core.io.ClassPathResource;
 import org.springframework.core.io.Resource;
-import org.springframework.test.util.ReflectionTestUtils;
 
 import static org.assertj.core.api.Assertions.assertThat;
 import static org.assertj.core.api.Assertions.assertThatExceptionOfType;
@@ -55,6 +53,7 @@
  * @author Brian Clozel
  */
 @ExtendWith(OutputCaptureExtension.class)
+@DirtiesUrlFactories
 class SslConnectorCustomizerTests {
 
 	private Tomcat tomcat;
@@ -72,8 +71,6 @@ void setup() {
 	@AfterEach
 	void stop() throws Exception {
 		System.clearProperty("javax.net.ssl.trustStorePassword");
-		ReflectionTestUtils.setField(TomcatURLStreamHandlerFactory.class, "instance", null);
-		ReflectionTestUtils.setField(URL.class, "factory", null);
 		this.tomcat.stop();
 	}
 

spring-boot-project/spring-boot/src/test/java/org/springframework/boot/web/servlet/server/AbstractServletWebServerFactoryTests.java

@@ -77,7 +77,6 @@
 import javax.servlet.http.HttpServletResponse;
 import javax.servlet.http.HttpSession;
 
-import org.apache.catalina.webresources.TomcatURLStreamHandlerFactory;
 import org.apache.http.HttpResponse;
 import org.apache.http.client.HttpClient;
 import org.apache.http.client.entity.InputStreamFactory;
@@ -112,6 +111,7 @@
 import org.springframework.boot.system.ApplicationTemp;
 import org.springframework.boot.testsupport.system.CapturedOutput;
 import org.springframework.boot.testsupport.system.OutputCaptureExtension;
+import org.springframework.boot.testsupport.web.servlet.DirtiesUrlFactories;
 import org.springframework.boot.testsupport.web.servlet.ExampleFilter;
 import org.springframework.boot.testsupport.web.servlet.ExampleServlet;
 import org.springframework.boot.web.server.Compression;
@@ -140,7 +140,6 @@
 import org.springframework.http.client.ClientHttpResponse;
 import org.springframework.http.client.HttpComponentsClientHttpRequestFactory;
 import org.springframework.test.util.ReflectionTestUtils;
-import org.springframework.util.ClassUtils;
 import org.springframework.util.FileCopyUtils;
 import org.springframework.util.StreamUtils;
 
@@ -167,6 +166,7 @@
  * @author Raja Kolli
  */
 @ExtendWith(OutputCaptureExtension.class)
+@DirtiesUrlFactories
 public abstract class AbstractServletWebServerFactoryTests {
 
 	@TempDir
@@ -205,20 +205,6 @@ void tearDown() {
 				// Ignore
 			}
 		}
-		if (ClassUtils.isPresent("org.apache.catalina.webresources.TomcatURLStreamHandlerFactory",
-				getClass().getClassLoader())) {
-			ReflectionTestUtils.setField(TomcatURLStreamHandlerFactory.class, "instance", null);
-		}
-		ReflectionTestUtils.setField(URL.class, "factory", null);
-	}
-
-	@AfterEach
-	void clearUrlStreamHandlerFactory() {
-		if (ClassUtils.isPresent("org.apache.catalina.webresources.TomcatURLStreamHandlerFactory",
-				getClass().getClassLoader())) {
-			ReflectionTestUtils.setField(TomcatURLStreamHandlerFactory.class, "instance", null);
-			ReflectionTestUtils.setField(URL.class, "factory", null);
-		}
 	}
 
 	@Test