I use:

 @TransactionAttribute(TransactionAttributeType.REQUIRES_NEW)
 public void add(String product)
 throws Exception {

 contractor = new Contractor();
 contractor.setName(product);
 manager.persist(contractor);
 int i=0/0; // Exception: / zero
 }

Transaction is rollback

But if i use:

@TransactionAttribute(TransactionAttributeType.REQUIRES_NEW)
 public void add(String product)
 throws Exception {

 contractor = new Contractor();
 contractor.setName(product);
 manager.persist(contractor);
 throw new Exception("New message"); // Simple Exception :)
 }

Transaction after exception is commited.
Help me solve this problem.
Thanx.