--- old/src/java.rmi/share/classes/sun/rmi/server/ActivatableRef.java	2018-12-06 14:53:40.480060405 -0500
+++ new/src/java.rmi/share/classes/sun/rmi/server/ActivatableRef.java	2018-12-06 14:53:40.308059552 -0500
@@ -370,7 +370,7 @@
         ref = null;
         String className = in.readUTF();
 
-        if (className.equals("")) return;
+        if (className.isEmpty()) return;
 
         try {
             Class<?> refClass = Class.forName(RemoteRef.packagePrefix + "." +