@Override
 public void initialize() {
   final NodeEngine nodeEngine = getNodeEngine();
   CollectionConfig config = getConfig(nodeEngine);
   final List<ItemListenerConfig> itemListenerConfigs = config.getItemListenerConfigs();
   for (ItemListenerConfig itemListenerConfig : itemListenerConfigs) {
     ItemListener listener = itemListenerConfig.getImplementation();
     if (listener == null && itemListenerConfig.getClassName() != null) {
       try {
         listener =
             ClassLoaderUtil.newInstance(
                 nodeEngine.getConfigClassLoader(), itemListenerConfig.getClassName());
       } catch (Exception e) {
         throw ExceptionUtil.rethrow(e);
       }
     }
     if (listener != null) {
       if (listener instanceof HazelcastInstanceAware) {
         ((HazelcastInstanceAware) listener)
             .setHazelcastInstance(nodeEngine.getHazelcastInstance());
       }
       addItemListener(listener, itemListenerConfig.isIncludeValue());
     }
   }
 }
 @Test
 public void testQueueConfig() {
   QueueConfig testQConfig = config.getQueueConfig("testQ");
   assertNotNull(testQConfig);
   assertEquals("testQ", testQConfig.getName());
   assertEquals(1000, testQConfig.getMaxSize());
   QueueConfig qConfig = config.getQueueConfig("q");
   assertNotNull(qConfig);
   assertEquals("q", qConfig.getName());
   assertEquals(2500, qConfig.getMaxSize());
   assertEquals(1, testQConfig.getItemListenerConfigs().size());
   ItemListenerConfig listenerConfig = testQConfig.getItemListenerConfigs().get(0);
   assertEquals("com.hazelcast.spring.DummyItemListener", listenerConfig.getClassName());
   assertTrue(listenerConfig.isIncludeValue());
 }