[jboss-user] [JBoss Seam] - why commit twice?

[luc_yuan]

    when i create a object using id whick is already in database when i press the create button i check if it exists,but i got my message age,why
    
  |       try {
  | 	
  | 					Kokyaku k = (Kokyaku) getEntityManager().createQuery(
  | 							"select k from Kokyaku k where k.kokyakuCd = :id")
  | 							.setParameter("id", this.instance.getKokyakuCd())
  | 							.getSingleResult();
  | 					if (k != null) {
  | 						FacesMessages.instance().add(
  | 								"kokyaku " + this.instance.getKokyakuCd() + "already exist");
  | 						isSuccess = false;
  | 					}
  | 	
  | 				} catch (NoResultException ex) {
  | 				}
  | 
  |     
    i see in other posts it seems there is something like tx1,tx2,but i can't find anything about this transaction behaviour in reference.
    anyone helps me

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