返回无状态会话Bean方法而未完成事务

Question

我使用glassfish 4.1 我的代码是

    @Stateless
    @TransactionManagement(TransactionManagementType.BEAN)

   public class IslemEJB<T, U> {
     @PersistenceContext(unitName = "etobsSentinelPU")
     private EntityManager em;
     @Resource
     private UserTransaction ut; 
     private T t;
     private U u;

public T updateMesajsizWithReturn(T t) {

    try {
        ut.begin();
        t = em.merge(t);
        em.flush();
        System.out.println(" Log id " + t);
        ut.commit(); 
    }
    catch (RollbackException | HeuristicMixedException | HeuristicRollbackException | IllegalStateException | NotSupportedException | SystemException ex) { 
        Logger.getLogger(IslemEJB.class.getName()).log(Level.SEVERE, null, ex);
        System.out.println(ex); 
        mesaj = "Hata : Güncelleme işlemi sırasında hata meydana geldi. "; 
        durum = false; 
    } 
    catch (SecurityException ex) {...}

错误是在启动应用程序时未完成事务而返回的无状态会话Bean方法。