Add application/json and /xml to default compressible mime types

Closes gh-11828

spring-boot-project/spring-boot/src/main/java/org/springframework/boot/web/server/Compression.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.
@@ -34,7 +34,8 @@ public class Compression {
 	 * Comma-separated list of MIME types that should be compressed.
 	 */
 	private String[] mimeTypes = new String[] { "text/html", "text/xml", "text/plain",
-			"text/css", "text/javascript", "application/javascript" };
+			"text/css", "text/javascript", "application/javascript", "application/json",
+			"application/xml" };
 
 	/**
 	 * Comma-separated list of user agents for which responses should not be compressed.

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

@@ -20,7 +20,6 @@ import org.apache.coyote.http11.Http11NioProtocol;
 import org.junit.Test;
 import org.junit.runner.RunWith;
 
-import org.springframework.boot.testsupport.runner.classpath.ClassPathOverrides;
 import org.springframework.boot.testsupport.runner.classpath.ModifiedClassPathRunner;
 
 import static org.assertj.core.api.Assertions.assertThat;
@@ -31,7 +30,6 @@ import static org.assertj.core.api.Assertions.assertThat;
  * @author Andy Wilkinson
  */
 @RunWith(ModifiedClassPathRunner.class)
-@ClassPathOverrides("org.apache.tomcat.embed:tomcat-embed-core:8.5.24")
 public class CompressionTests {
 
 	@Test