--- a/jdk/src/java.base/share/classes/java/lang/ref/ReferenceQueue.java	Wed Jul 05 21:09:59 2017 +0200
+++ b/jdk/src/java.base/share/classes/java/lang/ref/ReferenceQueue.java	Mon Dec 21 20:54:00 2015 +0100
@@ -53,7 +53,7 @@
 
     private static class Lock { };
     private Lock lock = new Lock();
-    private volatile Reference<? extends T> head = null;
+    private volatile Reference<? extends T> head;
     private long queueLength = 0;
 
     boolean enqueue(Reference<? extends T> r) { /* Called only by Reference class */