@Test
 public void testIssue508And513() throws Exception {
   HazelcastClient client = getHazelcastClient();
   IMap<String, HashSet<byte[]>> callEventsMap = client.getMap("CALL_EVENTS");
   IMap<String, Long> metaDataMap = client.getMap("CALL_META_DATA");
   IMap<String, byte[]> callStartMap = client.getMap("CALL_START_EVENTS");
   MultiMap<String, String> calls = client.getMultiMap("CALLS");
   calls.lock("1");
   calls.unlock("1");
   byte[] bytes = new byte[10];
   HashSet<byte[]> hashSet = new HashSet<byte[]>();
   hashSet.add(bytes);
   String callId = "1";
   callEventsMap.put(callId, hashSet);
   callStartMap.put(callId, bytes);
   metaDataMap.put(callId, 10L);
   Transaction txn = client.getTransaction();
   txn.begin();
   try {
     // remove the data
     callEventsMap.remove(callId);
     // remove meta data
     metaDataMap.remove(callId);
     // remove call start
     callStartMap.remove(callId);
     calls.put(callId, callId);
     txn.commit();
   } catch (Exception e) {
     fail();
   }
   assertNull(callEventsMap.get(callId));
   assertNull(metaDataMap.get(callId));
   assertNull(callStartMap.get(callId));
   assertEquals(0, callEventsMap.size());
   assertEquals(0, metaDataMap.size());
   assertEquals(0, callStartMap.size());
 }
 @Override
 protected void doRollback() throws TransactionException {
   logger.trace("doRollback");
   Transaction transaction = hazelcastInstance.getTransaction();
   transaction.rollback();
 }
 @Override
 protected void doCommit() throws TransactionException {
   logger.trace("doCommit");
   Transaction transaction = hazelcastInstance.getTransaction();
   transaction.commit();
 }