java - 线程和 hibernate session 的问题

我正在使用休眠3和春季。
当我启动线程时，发生了异常：

org.hibernate.HibernateException: Illegal attempt to associate a collection with two open sessions

我不知道如何使用这种架构分离实体或关闭会话。
感谢您的帮助。

CommunicationService.sendCommunications()代码：

public void sendCommunications(HibernateMessageToSendRepository messageToSendRepository)  {
    Long messageId = new Long(41); //this is only for test. the idea is get a list of id and generate a thread group.
    MessageSender sender = SmsSender(messageId, messageToSendRepository);
    sender.start();
}

调用sendCommunications代码：

ApplicationContext appCont = new ClassPathXmlApplicationContext("appContext.xml");
ServiceLocator serviceLocator = ServiceLocator.getInstance();
HibernateMessageToSendRepository messageToSendRepository = (HibernateMessageToSendRepository) appCont.getBean("messageToSendRepository");

CommunicationService communication = serviceLocator.getCommunicationService();
communication.sendCommunications(messageToSendRepository);

SmsSender（从MessageSender（线程）扩展）代码：

public class SmsSender extends MessageSender {

    public SmsSender(Long messageToSendId, HibernateMessageToSendRepository messageToSendRepository) {
        super(messageToSendRepository);
        MessageToSend messageToSendNew = this.messageToSendRepository.getById(messageToSendId);
        this.messageToSend = messageToSendNew;
    }

    public void run() {
        try {
            MessageToSendSms messageToSendSms = (MessageToSendSms) this.messageToSend;
            Iterator<CustomerByMessage> itCbmsgs = messageToSendSms.getCustomerByMessage().iterator();
            while (itCbmsgs.hasNext()) {
                CustomerByMessage cbm = (CustomerByMessage) itCbmsgs.next();

                //sms sending
                this.getGateway().sendSMS(cbm.getBody(), cbm.getCellphone());
                cbm.setStatus(CustomerByMessageStatus.SENT_OK);
                cbm.setSendingDate(Calendar.getInstance().getTime());
            }

            messageToSendSms.getMessage().setStatus(messageToSendStatus.ALL_MESSAGES_SENT);
            this.messageToSendRepository.update(messageToSendSms);
        } catch (Exception e) {
            this.log.error("Error en sms sender " + e.getMessage());
        }

    }
}

MessageToSendRepository代码：

public void update(MessageToSend messageToSend) {
    try {
        this.getSession().update(messageToSend);
    } catch (HibernateException e) {
        this.log.error(e.getMessage(), e);
        throw e;
    }
}

最佳答案

在检索messageToSendNew之后，但与另一个线程共享它之前，您需要分离它。您可以通过在休眠会话中调用Session.close()来分离对象。

请注意，您必须热切填充所需的所有字段。

如果需要使用新的会话重新连接它，则可以使用merge()方法。