Broader attempt at fixing URLStreamHandlerFactory pollution problem

This is a follow-on from d341499 that takes a broader approach to
clearing URLs URLStreamHandlerFactory.

See gh-5290

spring-boot/src/test/java/org/springframework/boot/context/embedded/AbstractEmbeddedServletContainerFactoryTests.java

@@ -65,6 +65,8 @@ import org.apache.http.impl.client.HttpClients;
 import org.apache.http.protocol.HttpContext;
 import org.apache.http.ssl.SSLContextBuilder;
 import org.junit.After;
+import org.junit.AfterClass;
+import org.junit.BeforeClass;
 import org.junit.Rule;
 import org.junit.Test;
 import org.junit.rules.ExpectedException;
@@ -86,6 +88,7 @@ import org.springframework.http.client.ClientHttpRequest;
 import org.springframework.http.client.ClientHttpResponse;
 import org.springframework.http.client.HttpComponentsAsyncClientHttpRequestFactory;
 import org.springframework.http.client.HttpComponentsClientHttpRequestFactory;
+import org.springframework.test.util.ReflectionTestUtils;
 import org.springframework.util.FileCopyUtils;
 import org.springframework.util.SocketUtils;
 import org.springframework.util.StreamUtils;
@@ -118,6 +121,12 @@ public abstract class AbstractEmbeddedServletContainerFactoryTests {
 
 	private final HttpClientContext httpClientContext = HttpClientContext.create();
 
+	@BeforeClass
+	@AfterClass
+	public static void uninstallUrlStreamHandlerFactory() {
+		ReflectionTestUtils.setField(URL.class, "factory", null);
+	}
+
 	@After
 	public void tearDown() {
 		if (this.container != null) {

spring-boot/src/test/java/org/springframework/boot/context/embedded/jetty/JettyEmbeddedServletContainerFactoryTests.java

@@ -17,7 +17,6 @@
 package org.springframework.boot.context.embedded.jetty;
 
 import java.io.IOException;
-import java.net.URL;
 import java.util.Arrays;
 import java.util.HashMap;
 import java.util.Map;
@@ -38,8 +37,6 @@ import org.eclipse.jetty.servlet.ServletHolder;
 import org.eclipse.jetty.util.thread.ThreadPool;
 import org.eclipse.jetty.webapp.Configuration;
 import org.eclipse.jetty.webapp.WebAppContext;
-import org.junit.AfterClass;
-import org.junit.BeforeClass;
 import org.junit.Test;
 import org.mockito.InOrder;
 
@@ -49,7 +46,6 @@ import org.springframework.boot.context.embedded.Compression;
 import org.springframework.boot.context.embedded.Ssl;
 import org.springframework.boot.web.servlet.ServletRegistrationBean;
 import org.springframework.http.HttpHeaders;
-import org.springframework.test.util.ReflectionTestUtils;
 
 import static org.assertj.core.api.Assertions.assertThat;
 import static org.mockito.Matchers.anyObject;
@@ -68,12 +64,6 @@ import static org.mockito.Mockito.mock;
 public class JettyEmbeddedServletContainerFactoryTests
 		extends AbstractEmbeddedServletContainerFactoryTests {
 
-	@BeforeClass
-	@AfterClass
-	public static void uninstallUrlStreamHandlerFactory() {
-		ReflectionTestUtils.setField(URL.class, "factory", null);
-	}
-
 	@Override
 	protected JettyEmbeddedServletContainerFactory getFactory() {
 		return new JettyEmbeddedServletContainerFactory(0);