--- a/src/java.base/windows/classes/sun/net/www/protocol/jar/JarFileFactory.java	Fri Dec 07 17:11:17 2018 +0100
+++ b/src/java.base/windows/classes/sun/net/www/protocol/jar/JarFileFactory.java	Fri Dec 07 11:51:17 2018 -0500
@@ -76,7 +76,7 @@
             // Deal with UNC pathnames specially. See 4180841
 
             String host = url.getHost();
-            if (host != null && !host.equals("") &&
+            if (host != null && !host.isEmpty() &&
                 !host.equalsIgnoreCase("localhost")) {
 
                 url = new URL("file", "", "//" + host + url.getPath());