线程和休眠会话的问题

Question

我正在使用休眠 3 和弹簧。 当我启动一个线程时发生了异常：

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

我不知道如何使用此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）扩展而来）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;
    }
}

Answer 1

您需要在检索到 messageToSendNew 之后将其分离，但在与其他线程共享之前。您可以通过在休眠会话上调用 Session.close() 来分离对象。

请注意，您必须急切地填充您需要的所有字段。

如果您需要通过新会话重新连接它，您可以使用merge() 方法。