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我得到一个懒惰的初始化异常，我不明白...奇怪的懒惰初始化异常
我使用Java，Hibernate，Spring和Wicket。
因此，从Form的保存方法（扩展检票窗体）时，我得到一个LazyInitializationException当访问一个对象的集合，但马上我可以访问另一个具有相同“配置”触发该例外集合：
这里是代码的形式：
therapyGroup.getTherapies().clear();
therapyGroup.getTherapies().addAll(therapiesOldGroup);
therapyGroup.getToxicities().add(lastTherapy.getToxicity());
而且在这些地方集合类中定义的一部分：
@OneToMany(mappedBy = "therapyGroup", fetch = FetchType.LAZY, orphanRemoval=true)
@Cascade(value = { CascadeType.MERGE, CascadeType.PERSIST, CascadeType.DELETE, CascadeType.SAVE_UPDATE })
@OrderBy(value = "date asc")
@Filters({ @Filter(name = "deletedFilter", condition = "deleted <> :deletedParam") })
@Cache(usage = CacheConcurrencyStrategy.TRANSACTIONAL, region = "TherapyGroup")
@Lazy
public Set<Therapy> getTherapies() {
return therapies;
}
@OneToMany(mappedBy = "therapyGroup", fetch = FetchType.LAZY, orphanRemoval=true)
@Cascade(value = { CascadeType.MERGE, CascadeType.PERSIST, CascadeType.DELETE, CascadeType.SAVE_UPDATE })
@OrderBy(value = "date asc")
@Filters({ @Filter(name = "deletedFilter", condition = "deleted <> :deletedParam") })
@Cache(usage = CacheConcurrencyStrategy.TRANSACTIONAL, region = "TherapyGroup")
@Lazy
public Set<Toxicity> getToxicities() {
return toxicities;
}
“有问题”的收集是毒性收集。如果我先交换命令并调用毒性，它也会抛出LazyInitializationException。这个例外总是由毒性而不是治疗所解雇......为什么？
编辑：这里是堆栈跟踪
根源：
org.hibernate.LazyInitializationException: failed to lazily initialize a collection of role: com.mycompany.myapp.data.TherapyGroup.toxicities, no session or session was closed
at org.hibernate.collection.AbstractPersistentCollection.throwLazyInitializationException(AbstractPersistentCollection.java:383)
at org.hibernate.collection.AbstractPersistentCollection.throwLazyInitializationExceptionIfNotConnected(AbstractPersistentCollection.java:375)
at org.hibernate.collection.AbstractPersistentCollection.initialize(AbstractPersistentCollection.java:368)
at org.hibernate.collection.PersistentSet.add(PersistentSet.java:212)
at com.mycompany.myapp.web.support.therapyend.TherapyEndSupportForm.onSaveFormData(TherapyEndSupportForm.java:135)
at com.mycompany.myapp.web.base.BaseForm.doSave(BaseForm.java:370)
at com.mycompany.myapp.web.base.BaseForm.saveAndTrigger(BaseForm.java:1137)
at com.mycompany.myapp.web.base.BaseForm.switchModalWindow(BaseForm.java:1128)
at com.mycompany.myapp.web.base.BaseForm.switchModalWindow(BaseForm.java:1077)
at com.mycompany.myapp.web.base.BaseForm.onSubmit(BaseForm.java:567)
at com.mycompany.myapp.web.comp.QuasiAjaxSubmitButton.onSubmit(QuasiAjaxSubmitButton.java:49)
at com.mycompany.myapp.web.comp.QuasiAjaxButton$1.onSubmit(QuasiAjaxButton.java:65)
at com.mycompany.myapp.web.comp.QuasiAjaxFormSubmitBehavior.onEvent(QuasiAjaxFormSubmitBehavior.java:151)
at org.apache.wicket.ajax.AjaxEventBehavior.respond(AjaxEventBehavior.java:177)
at org.apache.wicket.ajax.AbstractDefaultAjaxBehavior.onRequest(AbstractDefaultAjaxBehavior.java:286)
at org.apache.wicket.request.target.component.listener.BehaviorRequestTarget.processEvents(BehaviorRequestTarget.java:119)
at org.apache.wicket.request.AbstractRequestCycleProcessor.processEvents(AbstractRequestCycleProcessor.java:92)
at org.apache.wicket.RequestCycle.processEventsAndRespond(RequestCycle.java:1250)
at org.apache.wicket.RequestCycle.step(RequestCycle.java:1329)
at org.apache.wicket.RequestCycle.steps(RequestCycle.java:1428)
at org.apache.wicket.RequestCycle.request(RequestCycle.java:545)
at org.apache.wicket.protocol.http.WicketFilter.doGet(WicketFilter.java:479)
at org.apache.wicket.protocol.http.WicketFilter.doFilter(WicketFilter.java:312)
at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1139)
at org.springframework.orm.jpa.support.OpenEntityManagerInViewFilter.doFilterInternal(OpenEntityManagerInViewFilter.java:113)
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:76)
at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1139)
at org.mortbay.jetty.servlet.ServletHandler.handle(ServletHandler.java:378)
at org.mortbay.jetty.security.SecurityHandler.handle(SecurityHandler.java:216)
at org.mortbay.jetty.servlet.SessionHandler.handle(SessionHandler.java:181)
at org.mortbay.jetty.handler.ContextHandler.handle(ContextHandler.java:765)
at org.mortbay.jetty.webapp.WebAppContext.handle(WebAppContext.java:417)
at org.mortbay.jetty.handler.HandlerWrapper.handle(HandlerWrapper.java:152)
at org.mortbay.jetty.Server.handle(Server.java:324)
at org.mortbay.jetty.HttpConnection.handleRequest(HttpConnection.java:535)
at org.mortbay.jetty.HttpConnection$RequestHandler.content(HttpConnection.java:880)
at org.mortbay.jetty.HttpParser.parseNext(HttpParser.java:747)
at org.mortbay.jetty.HttpParser.parseAvailable(HttpParser.java:218)
at org.mortbay.jetty.HttpConnection.handle(HttpConnection.java:404)
at org.mortbay.jetty.bio.SocketConnector$Connection.run(SocketConnector.java:228)
at org.mortbay.thread.QueuedThreadPool$PoolThread.run(QueuedThreadPool.java:520)
com.mycompany.myapp.web.support.therapyend.TherapyEndSupportForm.onSaveFormData(TherapyEndSupportForm.java:135)是我叫therapyGroup.getToxicities().add(lastTherapy.getToxicity());
在同一行中有另一个呼叫：lastTherapy.getToxicity（）。你确定这不是问题吗？ – kostja
如果没有完整的堆栈跟踪，包括所有“引起来”部分，则无法回答此问题。就在昨天，我看到了这个确切的例外，其中“Caused By”显示数据库连接失败，即原因与代码无关。这可能不是你的问题，但除非我们能看到整个堆栈跟踪，否则答案可能是任何事情。 –
我已经添加了完整的堆栈跟踪。 – diminuta