--- old/src/java.base/share/classes/sun/net/www/protocol/mailto/Handler.java	2018-12-06 17:52:59.665412324 -0500
+++ new/src/java.base/share/classes/sun/net/www/protocol/mailto/Handler.java	2018-12-06 17:52:59.501411511 -0500
@@ -127,7 +127,7 @@
          * Let's just make sure we DO have an Email address in the URL.
          */
         boolean nogood = false;
-        if (file == null || file.equals(""))
+        if (file == null || file.isEmpty())
             nogood = true;
         else {
             boolean allwhites = true;