Detect Tomcat's "war" protocol as jar URL

Issue: SPR-15332

spring-core/src/main/java/org/springframework/util/ResourceUtils.java

 /*
- * Copyright 2002-2016 the original author or authors.
+ * Copyright 2002-2017 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.
@@ -63,6 +63,9 @@ public abstract class ResourceUtils {
 	/** URL protocol for an entry from a jar file: "jar" */
 	public static final String URL_PROTOCOL_JAR = "jar";
 
+	/** URL protocol for an entry from a war file: "war" */
+	public static final String URL_PROTOCOL_WAR = "war";
+
 	/** URL protocol for an entry from a zip file: "zip" */
 	public static final String URL_PROTOCOL_ZIP = "zip";
 
@@ -258,7 +261,7 @@ public abstract class ResourceUtils {
 
 	/**
 	 * Determine whether the given URL points to a resource in the file system,
-	 * that is, has protocol "file", "vfsfile" or "vfs".
+	 * i.e. has protocol "file", "vfsfile" or "vfs".
 	 * @param url the URL to check
 	 * @return whether the URL has been identified as a file system URL
 	 */
@@ -269,15 +272,16 @@ public abstract class ResourceUtils {
 	}
 
 	/**
-	 * Determine whether the given URL points to a resource in a jar file,
-	 * that is, has protocol "jar", "zip", "vfszip" or "wsjar".
+	 * Determine whether the given URL points to a resource in a jar file.
+	 * i.e. has protocol "jar", "war, ""zip", "vfszip" or "wsjar".
 	 * @param url the URL to check
 	 * @return whether the URL has been identified as a JAR URL
 	 */
 	public static boolean isJarURL(URL url) {
 		String protocol = url.getProtocol();
-		return (URL_PROTOCOL_JAR.equals(protocol) || URL_PROTOCOL_ZIP.equals(protocol) ||
-				URL_PROTOCOL_VFSZIP.equals(protocol) || URL_PROTOCOL_WSJAR.equals(protocol));
+		return (URL_PROTOCOL_JAR.equals(protocol) || URL_PROTOCOL_WAR.equals(protocol) ||
+				URL_PROTOCOL_ZIP.equals(protocol) || URL_PROTOCOL_VFSZIP.equals(protocol) ||
+				URL_PROTOCOL_WSJAR.equals(protocol));
 	}
 
 	/**