--- old/src/java.base/unix/classes/sun/nio/ch/PollSelectorImpl.java	2018-02-07 11:23:42.000000000 +0000
+++ new/src/java.base/unix/classes/sun/nio/ch/PollSelectorImpl.java	2018-02-07 11:23:42.000000000 +0000
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2001, 2016, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2001, 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
@@ -28,7 +28,6 @@
 import java.io.IOException;
 import java.nio.channels.*;
 import java.nio.channels.spi.*;
-import java.util.*;
 
 
 /**
@@ -44,7 +43,7 @@
     private int fd1;
 
     // Lock for interrupt triggering and clearing
-    private Object interruptLock = new Object();
+    private final Object interruptLock = new Object();
     private boolean interruptTriggered = false;
 
     /**