Code example for EntityManagerHolder

0
            try 
            { 
                // If we are not part of another transaction, create the EntityManager and bind it 
                // to the TransactionSynchronizationManager 
                EntityManager em = createEntityManager(); 
                TransactionSynchronizationManager.bindResource(getEntityManagerFactory(), 
                    new EntityManagerHolder(em)); 
            } 
            catch (PersistenceException ex) 
            { 
                throw new DataAccessResourceFailureException("Could not create JPA EntityManager", 
                    ex); 
            } 
        } 
 
        Object ret = null; 
 
        try 
        { 
            ret = invocation.proceed(); 
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