public static URL extractJarFileURL(URL jarUrl) throws MalformedURLException {
		String urlFile = jarUrl.getFile();
		int separatorIndex = urlFile.indexOf(JAR_URL_SEPARATOR);
		if (separatorIndex != -1) {
			String jarFile = urlFile.substring(0, separatorIndex);
			try {
				return new URL(jarFile);
			}
			catch (MalformedURLException ex) {
				// Probably no protocol in original jar URL, like "jar:C:/mypath/myjar.jar".
				// This usually indicates that the jar file resides in the file system.
				if (!jarFile.startsWith("/")) {
					jarFile = "/" + jarFile;
				}
				return new URL(FILE_URL_PREFIX + jarFile);
			}
		}
		else {
			return jarUrl;
		}
	}