--- a/jdk/test/java/nio/file/WatchService/UpdateInterference.java	Tue Aug 23 10:32:14 2016 -0700
+++ b/jdk/test/java/nio/file/WatchService/UpdateInterference.java	Tue Aug 23 10:38:01 2016 -0700
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2015, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2015, 2016, 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
@@ -33,6 +33,9 @@
 import static java.nio.file.StandardWatchEventKinds.*;
 
 public class UpdateInterference {
+
+    private static volatile boolean stop;
+
     public static void main(String[] args) throws IOException, InterruptedException {
         final Path root = Files.createTempDirectory("test");
         final Path foo = root.resolve("foo");
@@ -43,64 +46,89 @@
         Files.createDirectory(bar);
         Files.createDirectory(baz);
 
-        final WatchService watcher = root.getFileSystem().newWatchService();
-        final WatchKey fooKey = foo.register(watcher, ENTRY_CREATE);
-        final WatchKey barKey = bar.register(watcher, ENTRY_CREATE);
+        try (final WatchService watcher = root.getFileSystem().newWatchService()) {
+            final WatchKey fooKey = foo.register(watcher, ENTRY_CREATE);
+            final WatchKey barKey = bar.register(watcher, ENTRY_CREATE);
+
+            Thread t1 = null;
+            Thread t2 = null;
+            try {
+                t1 = new Thread() {
 
-        new Thread() {
-            { setDaemon(true); }
+                    @Override
+                    public void run() {
+                        while (!stop) {
+                            try {
+                                final Path temp = Files.createTempFile(foo, "temp", ".tmp");
+                                Files.delete(temp);
+                                Thread.sleep(10);
+                            } catch (IOException | InterruptedException e) {
+                                throw new RuntimeException(e);
+                            }
+                        }
+                    }
+                };
+
+                t2 = new Thread() {
 
-            @Override
-            public void run() {
-                while (true) {
-                    try {
-                        final Path temp = Files.createTempFile(foo, "temp", ".tmp");
-                        Files.delete(temp);
-                        Thread.sleep(10);
-                    } catch (IOException | InterruptedException e) {
-                        throw new RuntimeException(e);
+                    @Override
+                    public void run() {
+                        WatchKey bazKeys[] = new WatchKey[32];
+                        while (!stop) {
+                            try {
+                                for( int i = 0; i < bazKeys.length; i++) {
+                                    bazKeys[i] = baz.register(watcher, ENTRY_CREATE);
+                                }
+                                for( int i = 0; i < bazKeys.length; i++) {
+                                    bazKeys[i].cancel();
+                                }
+                                Thread.sleep(1);
+                            } catch (IOException | InterruptedException e) {
+                                throw new RuntimeException(e);
+                            }
+                        }
                     }
+                };
+
+                t1.start();
+                t2.start();
+
+                long time = System.currentTimeMillis();
+                while ((System.currentTimeMillis() - time) < 15000) {
+                    final WatchKey key = watcher.poll(60, TimeUnit.SECONDS);
+                    if (key == null) continue;
+
+                    if (key != fooKey) {
+                        List<WatchEvent<?>> pollEvents = key.pollEvents();
+                        for (WatchEvent<?> watchEvent : pollEvents) {
+                            System.out.println(watchEvent.count() + " " +
+                                            watchEvent.kind() + " " +
+                                            watchEvent.context());
+                        }
+                        throw new RuntimeException("Event received for unexpected key");
+                    }
+                    key.reset();
+                }
+            } finally {
+                // the threads should stop before WatchService is closed
+                // to avoid ClosedWatchServiceException
+                stop = true;
+
+                // wait for threads to finish
+                if (t1 != null) {
+                    t1.join();
+                }
+
+                if (t2 != null) {
+                    t2.join();
                 }
             }
-        }.start();
-
-        new Thread() {
-            { setDaemon(true); }
-
-            @Override
-            public void run() {
-                WatchKey bazKeys[] = new WatchKey[32];
-                while (true) {
-                    try {
-                        for( int i = 0; i < bazKeys.length; i++) {
-                            bazKeys[i] = baz.register(watcher, ENTRY_CREATE);
-                        }
-                        for( int i = 0; i < bazKeys.length; i++) {
-                            bazKeys[i].cancel();
-                        }
-                        Thread.sleep(1);
-                    } catch (IOException | InterruptedException e) {
-                        throw new RuntimeException(e);
-                    }
-                }
-            }
-        }.start();
-
-        long time = System.currentTimeMillis();
-        while ((System.currentTimeMillis() - time) < 15000) {
-            final WatchKey key = watcher.poll(60, TimeUnit.SECONDS);
-            if (key == null) continue;
-
-            if (key != fooKey) {
-                List<WatchEvent<?>> pollEvents = key.pollEvents();
-                for (WatchEvent<?> watchEvent : pollEvents) {
-                    System.out.println(watchEvent.count() + " " +
-                                       watchEvent.kind() + " " +
-                                       watchEvent.context());
-                }
-                throw new RuntimeException("Event received for unexpected key");
-            }
-            key.reset();
+        } finally {
+            // clean up
+            Files.delete(foo);
+            Files.delete(bar);
+            Files.delete(baz);
+            Files.delete(root);
         }
     }
 }