Question

如果我用wildfly 14服务器运行代码，我将得到以下提示。相同的代码可用于wildfly13。哪里可能出问题了？

Caused by: org.hibernate.LazyInitializationException: could not initialize proxy [ch.example.tool.entity.Benutzer#12] - the owning Session was closed
    at org.hibernate.proxy.AbstractLazyInitializer.initialize(AbstractLazyInitializer.java:172)
    at org.hibernate.proxy.AbstractLazyInitializer.getIdentifier(AbstractLazyInitializer.java:89)
    at org.hibernate.internal.SessionImpl.getProxyIdentifier(SessionImpl.java:1752)
    at org.hibernate.internal.SessionImpl.getContextEntityIdentifier(SessionImpl.java:1743)
    at org.hibernate.engine.internal.ForeignKeys.getEntityIdentifierIfNotUnsaved(ForeignKeys.java:271)
    at org.hibernate.type.EntityType.getIdentifier(EntityType.java:495)
    at org.hibernate.type.EntityType.nullSafeSet(EntityType.java:280)
    at org.hibernate.persister.entity.AbstractEntityPersister.dehydrate(AbstractEntityPersister.java:2868)
    at org.hibernate.persister.entity.AbstractEntityPersister.update(AbstractEntityPersister.java:3307)
    at org.hibernate.persister.entity.AbstractEntityPersister.updateOrInsert(AbstractEntityPersister.java:3229)
    at org.hibernate.persister.entity.AbstractEntityPersister.update(AbstractEntityPersister.java:3630)
    at org.hibernate.action.internal.EntityUpdateAction.execute(EntityUpdateAction.java:146)
    at org.hibernate.engine.spi.ActionQueue.executeActions(ActionQueue.java:604)
    at org.hibernate.engine.spi.ActionQueue.executeActions(ActionQueue.java:478)
    at org.hibernate.event.internal.AbstractFlushingEventListener.performExecutions(AbstractFlushingEventListener.java:356)
    at org.hibernate.event.internal.DefaultFlushEventListener.onFlush(DefaultFlushEventListener.java:39)
    at org.hibernate.internal.SessionImpl.doFlush(SessionImpl.java:1454)
    ... 122 more

Answer 1

我必须为Wildfly 14中的合并操作显式加载惰性代理引用。这样就可以了。

Wildfly 13及之前版本：

@Transactional
public class VergleichDAOImpl implements VergleichDAO {

    @PersistenceContext
    private EntityManager em;


    @Override
    public void save(Vergleich vergleich) {     

        if(vergleich.getId() == null) {
            em.persist(vergleich);
        } else {
            em.merge(vergleich);
        }
    }

Wildfly 14

@Transactional
public class VergleichDAOImpl implements VergleichDAO {

    @PersistenceContext
    private EntityManager em;


    @Override
    public void save(Vergleich vergleich) {     

        if(vergleich.getId() == null) {
            em.persist(vergleich);
        } else {
            Benutzer benutzer  = em.find(Benutzer.class, vergleich.getBenutzer().getId());
            vergleich.setBenutzer(benutzer);
            em.merge(vergleich);
        }
    }

Answer 2

我还选择了一种解决方法，所有实体@ManyToOne都已使用@NotAudited进行注释，因此Envers不会在entityManager关闭后尝试加载它们。目前有效，似乎是一个Hibernate错误。

Answer 3

在this article中，可以在配置中设置hibernate.jpa.compliance.proxy=false（因为Wildfly可能将其设置为true）。

Wildfly 14的lazyinitalizationexception：无法初始化代理-拥有的会话已关闭

3 个答案: