src/java.rmi/share/classes/sun/rmi/server/ActivationGroupImpl.java

@@ -1,7 +1,7 @@
 /*
- * Copyright (c) 1997, 2018, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 1997, 2019, 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

@@ -67,10 +67,11 @@
     /** maps persistent IDs to activated remote objects */
     private final Hashtable<ActivationID,ActiveEntry> active =
         new Hashtable<>();
     private boolean groupInactive = false;
     private final ActivationGroupID groupID;
+    @SuppressWarnings("serial")  // Conditionally serializable
     private final List<ActivationID> lockedIDs = new ArrayList<>();
 
     /**
      * Creates a default activation group implementation.
      *