src/jdk.jartool/share/classes/sun/tools/jar/Main.java

@@ -1,7 +1,7 @@
 /*
- * Copyright (c) 1996, 2017, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 1996, 2018, Oracle and/or its affiliates. All rights reserved.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
  * This code is free software; you can redistribute it and/or modify it
  * under the terms of the GNU General Public License version 2 only, as
  * published by the Free Software Foundation.  Oracle designates this

@@ -691,11 +691,11 @@
             }
         } else if (cflag && (mname == null)) {
             usageError(getMsg("error.bad.cflag"));
             return false;
         } else if (uflag) {
-            if ((mname != null) || (ename != null)) {
+            if ((mname != null) || (ename != null) || moduleVersion != null) {
                 /* just want to update the manifest */
                 return true;
             } else {
                 usageError(getMsg("error.bad.uflag"));
                 return false;