final TransactionContext context = instance.newTransactionContext();
final MultiMap<Object, Object> mm = instance.getMultiMap("testMultiMapContainsEntry");
mm.put("1", "value");
assertTrue(mm.containsEntry("1", "value"));
context.beginTransaction();
TransactionalMultiMap txnMap = context.getMultiMap("testMultiMapContainsEntry");
txnMap.put("1", "value2");
assertTrue(mm.containsEntry("1", "value"));
assertFalse(mm.containsEntry("1", "value2"));
txnMap.remove("1", "value2");