src/java.base/share/classes/sun/nio/ch/MembershipKeyImpl.java

@@ -1,7 +1,7 @@
 /*
- * Copyright (c) 2008, 2009, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2008, 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

@@ -44,11 +44,11 @@
     private final InetAddress source;
 
     private volatile boolean invalid;
 
     // lock used when creating or accessing blockedSet
-    private Object stateLock = new Object();
+    private final Object stateLock = new Object();
 
     // set of source addresses that are blocked
     private HashSet<InetAddress> blockedSet;
 
     private MembershipKeyImpl(MulticastChannel ch,