not able to insert data in db using jpa(hibernate as provider) and jboss AS

[ambika mullasseri]

i am trying to insert data to my mssql db using JPA(hibernate as JPA provider) in JBoss.the server logs give no errors but data is not inserted.

  
EntityManagerFactory emf = Persistence.createEntityManagerFactory("mycache");
	
	EntityManager em=null;
	try{
		UserTransaction utx = (UserTransaction)new InitialContext().lookup("java:comp/UserTransaction");
		em= emf.createEntityManager();
		 utx.begin();
                                // some object created
                                 em.persist(thatobj);
		 utx.commit(); 

please help...