--- old/src/java.base/share/classes/sun/security/util/DomainName.java	2018-12-06 17:25:52.029341313 -0500
+++ new/src/java.base/share/classes/sun/security/util/DomainName.java	2018-12-06 17:25:51.861340480 -0500
@@ -363,7 +363,7 @@
             }
 
             private static int numLabels(String rule) {
-                if (rule.equals("")) {
+                if (rule.isEmpty()) {
                     return 0;
                 }
                 int len = rule.length();