--- old/src/java.base/share/classes/sun/net/www/protocol/jar/URLJarFile.java	2018-12-06 17:52:58.913408595 -0500
+++ new/src/java.base/share/classes/sun/net/www/protocol/jar/URLJarFile.java	2018-12-06 17:52:58.749407782 -0500
@@ -111,7 +111,7 @@
              * 'file:' URLs can be accessible through ftp.
              */
             String host = url.getHost();
-            if (host == null || host.equals("") || host.equals("~") ||
+            if (host == null || host.isEmpty() || host.equals("~") ||
                 host.equalsIgnoreCase("localhost"))
                 return true;
         }