Java Bean CDI 空指针异常

发布于 2024-11-19 15:26:22 字数 666 浏览 10 评论 0原文

我有一个普通的 java bean，它是带有 jms 资源的单例，如下所示：

@Resource(lookup="jms/queueConnectionFactory")
  private QueueConnectionFactory myQueueConnFactory;

  @Resource(lookup="jms/myQueue")
  private Queue myMessageQueue;

  private Connection myConn;
  private Session mySession;

  private MessageProducer msgProducer;
  private MapMessage myMsg;

  @PersistenceContext(name="OrderServicePU")
  EntityManager em;

  private static MyProducer msgClientProducer;

我尝试将其注入到 servlet 控制器，但导致空指针异常，其中队列和连接工厂未初始化。

@Inject private MyProducer msgProducer;

我定义了 beans.xml 和 glassfish-resources.xml 。

这有什么问题吗？

原文

I have a normal java bean which is singleton with jms resource like this :

@Resource(lookup="jms/queueConnectionFactory")
  private QueueConnectionFactory myQueueConnFactory;

  @Resource(lookup="jms/myQueue")
  private Queue myMessageQueue;

  private Connection myConn;
  private Session mySession;

  private MessageProducer msgProducer;
  private MapMessage myMsg;

  @PersistenceContext(name="OrderServicePU")
  EntityManager em;

  private static MyProducer msgClientProducer;

I tried to inject it to servlet controller but resulted with null pointer exception where the queue and connection factory is not get initialized.