Spring、Hibernate - TransactionException：已有关联的托管连接

Question

我正在开发一个使用Spring/Hibernate/Vaadin框架的应用程序，但是尽管做了很多研究，我始终无法解决一个问题。我的应用程序分为四个层次：模型<->存储库<->服务<->视图。

当我在我的笔记本电脑上时，尝试显示我的应用程序的视图时没有任何问题。但是当我将我的应用程序放在预生产服务器上供人们测试时，Tomcat日志会显示以下错误信息：

Caused by: org.springframework.orm.jpa.JpaSystemException: org.hibernate.TransactionException: Already have an associated managed connection; nested exception is javax.persistence.PersistenceException: org.hibernate.TransactionException: Already have an associated managed connection
    at org.springframework.orm.jpa.EntityManagerFactoryUtils.convertJpaAccessExceptionIfPossible(EntityManagerFactoryUtils.java:311)
    at org.springframework.orm.jpa.aspectj.JpaExceptionTranslatorAspect.ajc$afterThrowing$org_springframework_orm_jpa_aspectj_JpaExceptionTranslatorAspect$1$18a1ac9(JpaExceptionTranslatorAspect.aj:15)
    at com.code.repositories.jpa.SuperRepository.findAll(SuperRepository.java:99)
    at com.code.service.ActorService.findAllAddressTypes(ActorService.java:103)
    at com.code.views.vaadin.views.contact.AddressTypeView.buildLayout(AddressTypeView.java:50)
    at com.code.views.vaadin.layout.objects.CodeView.<init>(CodeView.java:29)
    at com.code.views.vaadin.views.AbstractEntityView.<init>(AbstractEntityView.java:25)
    at com.code.views.vaadin.views.contact.AddressTypeView.<init>(AddressTypeView.java:31)
    ... 65 more
Caused by: javax.persistence.PersistenceException: org.hibernate.TransactionException: Already have an associated managed connection
    at org.hibernate.ejb.AbstractEntityManagerImpl.convert(AbstractEntityManagerImpl.java:1360)
    at org.hibernate.ejb.AbstractEntityManagerImpl.convert(AbstractEntityManagerImpl.java:1288)
    at org.hibernate.ejb.AbstractEntityManagerImpl.throwPersistenceException(AbstractEntityManagerImpl.java:1370)
    at org.hibernate.ejb.TransactionImpl.begin(TransactionImpl.java:60)
    at org.springframework.orm.jpa.ExtendedEntityManagerCreator$ExtendedEntityManagerInvocationHandler.enlistInCurrentTransaction(ExtendedEntityManagerCreator.java:421)
    at org.springframework.orm.jpa.ExtendedEntityManagerCreator$ExtendedEntityManagerInvocationHandler.doJoinTransaction(ExtendedEntityManagerCreator.java:398)
    at org.springframework.orm.jpa.ExtendedEntityManagerCreator$ExtendedEntityManagerInvocationHandler.invoke(ExtendedEntityManagerCreator.java:356)
    at $Proxy285.createNamedQuery(Unknown Source)
    ... 71 more
Caused by: org.hibernate.TransactionException: Already have an associated managed connection
    at org.hibernate.engine.transaction.internal.jdbc.JdbcTransaction.doBegin(JdbcTransaction.java:65)
    at org.hibernate.engine.transaction.spi.AbstractTransactionImpl.begin(AbstractTransactionImpl.java:160)
    at org.hibernate.internal.SessionImpl.beginTransaction(SessionImpl.java:1309)
    at org.hibernate.ejb.TransactionImpl.begin(TransactionImpl.java:57)

我认为问题出在多个用户尝试访问相同的数据上，但我不确定。

你们中有人遇到过同样的问题吗？

谢谢。

如果需要更多的代码，请不要犹豫。

编辑

是的，我使用Spring Security，在我的服务中注入了仓库。一个典型的服务方法如下：

AddressTypeView

@Resource private ActorService actorService;

private BeanItemContainer<AddressType> container;
private EntityList list;
private AddressTypeForm form;

/**
 * Build layout
 */
public void buildLayout() {
    super.buildLayout();

    container = new BeanItemContainer<AddressType>(AddressType.class);
    container.addAll(actorService.findAllAddressTypes());

    list = new EntityList();
    list.addActionHandler(new EntityListActionHandler(this));
    list.setContainerDataSource(container);
    list.setVisibleColumns(AddressType.TABLE_FIELDS);
    list.setColumnHeaders(list.getColumnHeaders());

    form = new AddressTypeForm(container);

    list.addListener(new ItemClickEvent.ItemClickListener() {

        private static final long serialVersionUID = 1L;

        @Override
        public void itemClick(ItemClickEvent event) {   
            AddressType selected = (AddressType) event.getItemId();
            form.setItemDataSource(new BeanItem<AddressType>(selected));
            form.setImmediate(true);
        }
    });

    VerticalSplitPanel panel = new VerticalSplitPanel();
    panel.setFirstComponent(list);
    panel.setSecondComponent(form);

    getVerticalLayout().addComponent(toolBar);
    getVerticalLayout().addComponent(panel);
    getVerticalLayout().setExpandRatio(panel, 1);
}

演员服务

/**
 * Find all address types
 * @return
 */
public List<AddressType> findAllAddressTypes() {
    return addressTypeRepository.findAll();
}

AdressTypeRepository

@SuppressWarnings("unchecked")
@Override
@Transactional
public List<T> findAll() {
    Query query = this.entityManager.createNamedQuery(this.entityClass.getSimpleName() + ".findAll");
    return query.getResultList();
}

- c4k

---

你找到这个问题的解决方案了吗？请提供一些建议，因为我也遇到了同样的问题。 - Vivek Giri

我刚刚将解决方案添加为答案。 - c4k

Answer 1

问题出在@PersistenceContext注解上。我原本的写法是：

@PersistenceContext(type = PersistenceContextType.EXTENDED)
private EntityManager entityManager;

我用以下内容替换了它:

@PersistenceContext(type = PersistenceContextType.TRANSACTION)
private EntityManager entityManager;

- c4k

Answer 2

你在笔记本电脑和预生产服务器之间运行了不同的应用程序服务器吗？例如，你在笔记本电脑上使用Tomcat，但在预生产服务器上使用WebLogic，或者类似的东西？如果是这样，区别可能在于DataSource bean的设置。

- Wins