@Test
 public void lockMap() throws InterruptedException {
   HazelcastClient hClient = getHazelcastClient();
   final IMap<String, String> map = hClient.getMap("lockMap");
   final CountDownLatch unlockLatch = new CountDownLatch(1);
   final CountDownLatch latch = new CountDownLatch(1);
   map.put("a", "b");
   map.lockMap(1, TimeUnit.SECONDS);
   assertTrue(map.tryPut("a", "c", 10, TimeUnit.MILLISECONDS));
   new Thread(
           new Runnable() {
             public void run() {
               assertFalse(map.lockMap(10, TimeUnit.MILLISECONDS));
               unlockLatch.countDown();
               assertTrue(map.lockMap(Long.MAX_VALUE, TimeUnit.SECONDS));
               latch.countDown();
               // map.unlockMap();
             }
           })
       .start();
   assertTrue(unlockLatch.await(10, TimeUnit.SECONDS));
   Thread.sleep(2000);
   map.unlockMap();
   assertEquals("c", map.getMapEntry("a").getValue());
   assertTrue(latch.await(10, TimeUnit.SECONDS));
 }
 @Test
 public void tryPut() throws InterruptedException {
   HazelcastClient hClient = getHazelcastClient();
   IMap<String, String> map = hClient.getMap("tryPut");
   assertEquals(0, map.size());
   Boolean result = map.tryPut("1", "CBDEF", 1, TimeUnit.SECONDS);
   assertTrue(result);
   assertEquals(1, map.size());
 }