Tapestry 5.3.8 + Jetty + Hibernate 4.3.5 + XAMPP 1.8.3 - IdClass使用（派生）实体，为什么在尝试合并时它们是分离的？

时间：2015-02-12 09:15:13

标签： hibernate jpa persistence tapestry detach

在问题中使用组合，我有以下实体：

一些任务：

@Entity
public class Task {
    @Id
    @GeneratedValue(strategy = GenerationType.AUTO)
    private long id;
}

一些工人：

@Entity
public class Worker {

    @Id
    @GeneratedValue(strategy=GenerationType.IDENTITY)
    @NonVisual
    private long id;

}

关于任务的一些状态：

@Entity
@IdClass(TaskStatusId.class)
public class TaskStatus {

    @Id
    @ManyToOne
    private Worker worker

    @Id
    @ManyToOne
    private Task task;

}

注意：我在TaskStatus和其他两个实体之间只有一个单向关系。 Task和Worker都不包含List。

现在我有一些Task和Workers的数据库条目，以及一些使用stati的条目。这些是在启动应用程序时创建并保留的测试对象。一切正常。

现在我有一个Tapestry页面，可以找到一个Task和一个worker，并将它们存储在页面属性中。

SomePage.java：

@Property
@Persist
private Task someTask;

@Property
@Persist
private Worker someWorker;

SomePage.tml：

<t:someComponent selectedTask="someTask" selectedWorker="someWorker"/>

页面中的一个组件接收Task和Worker作为参数，并使用我的DAO层来查找使用两者的TaskStatus，这也有效。

SomeComponent.java：

@Parameter(required=true)
@Property
Task selectedTask;

@Parameter(required=true)
@Property
Worker selectedWorker;

@Property
@Persist
TaskStatus someStatus;

void setupRender() {
    if (selectedTask != null && user != null) {
        if (someStatus == null || someStatus.getTask() != selectedTask) {
            someStatus = taskStatusDAO.findByWorkerAndTask(selectedWorker, selectedTask);
        }
    }
}

public void onActionFromUpdateStatus() {
    someStatus = taskStatusDAO.update(someStatus);
}

最后，我在组件中有一个Actionlink，它执行以下操作：

  • 更新TaskStatus对象中的Date字段
  • 尝试使用我的DAO图层保存对象的更改，更具体的是我的合并 - 方法：

界面：

@CommitAfter
public T update(T entity);

实现：

public T update(T entity) {
    return em.merge(entity);
}

当我尝试合并TaskStatus对象时，我得到了异常：

org.hibernate.PersistentObjectException: 
detached entity passed to persist: some.package.Task

堆栈跟踪：

[ERROR] TapestryModule.RequestExceptionHandler Processing of request failed with uncaught exception: org.hibernate.PersistentObjectException: detached entity passed to persist: some.package.entities.Task
org.apache.tapestry5.ioc.internal.OperationException: org.hibernate.PersistentObjectException: detached entity passed to persist: some.package.entities.Task [at classpath:some/package/components/affected/someComponent.tml, line 21]
    at org.apache.tapestry5.ioc.internal.OperationTrackerImpl.logAndRethrow(OperationTrackerImpl.java:121)
    at org.apache.tapestry5.ioc.internal.OperationTrackerImpl.invoke(OperationTrackerImpl.java:88)
    at org.apache.tapestry5.ioc.internal.PerThreadOperationTracker.invoke(PerThreadOperationTracker.java:87)
    at org.apache.tapestry5.ioc.internal.RegistryImpl.invoke(RegistryImpl.java:1124)
    at org.apache.tapestry5.internal.structure.ComponentPageElementResourcesImpl.invoke(ComponentPageElementResourcesImpl.java:146)
    at org.apache.tapestry5.internal.structure.ComponentPageElementImpl.triggerContextEvent(ComponentPageElementImpl.java:1058)
    at org.apache.tapestry5.internal.services.AjaxComponentEventRequestHandler.handle(AjaxComponentEventRequestHandler.java:110)
    at org.apache.tapestry5.internal.services.ajax.AjaxFormUpdateFilter.handle(AjaxFormUpdateFilter.java:56)
    at $ComponentEventRequestHandler_20d7f9a2019d1.handle(Unknown Source)
    at $ComponentEventRequestHandler_20d7f9a2019c9.handle(Unknown Source)
    at org.apache.tapestry5.internal.services.AjaxFilter.handle(AjaxFilter.java:42)
    at $ComponentEventRequestHandler_20d7f9a2019cb.handle(Unknown Source)
    at org.apache.tapestry5.upload.internal.services.UploadExceptionFilter.handle(UploadExceptionFilter.java:75)
    at $ComponentEventRequestHandler_20d7f9a2019cb.handle(Unknown Source)
    at org.apache.tapestry5.services.TapestryModule$41.handle(TapestryModule.java:2475)
    at $ComponentEventRequestHandler_20d7f9a2019cb.handle(Unknown Source)
    at $ComponentEventRequestHandler_20d7f9a2018ce.handle(Unknown Source)
    at org.apache.tapestry5.internal.services.ComponentRequestHandlerTerminator.handleComponentEvent(ComponentRequestHandlerTerminator.java:43)
    at some.package.services.PageProtectionFilter.handleComponentEvent(PageProtectionFilter.java:94)
    at $ComponentRequestFilter_20d7f9a2018cd.handleComponentEvent(Unknown Source)
    at $ComponentRequestHandler_20d7f9a2018d0.handleComponentEvent(Unknown Source)
    at org.apache.tapestry5.services.InitializeActivePageName.handleComponentEvent(InitializeActivePageName.java:39)
    at $ComponentRequestHandler_20d7f9a2018d0.handleComponentEvent(Unknown Source)
    at $ComponentRequestHandler_20d7f9a20189c.handleComponentEvent(Unknown Source)
    at org.apache.tapestry5.internal.services.ComponentEventDispatcher.dispatch(ComponentEventDispatcher.java:46)
    at $Dispatcher_20d7f9a20189f.dispatch(Unknown Source)
    at $Dispatcher_20d7f9a201898.dispatch(Unknown Source)
    at org.apache.tapestry5.services.TapestryModule$RequestHandlerTerminator.service(TapestryModule.java:302)
    at some.package.services.AppModule$1.service(AppModule.java:175)
    at $RequestFilter_20d7f9a201897.service(Unknown Source)
    at $RequestHandler_20d7f9a201899.service(Unknown Source)
    at org.apache.tapestry5.internal.services.RequestErrorFilter.service(RequestErrorFilter.java:26)
    at $RequestHandler_20d7f9a201899.service(Unknown Source)
    at org.apache.tapestry5.services.TapestryModule$3.service(TapestryModule.java:902)
    at $RequestHandler_20d7f9a201899.service(Unknown Source)
    at org.apache.tapestry5.services.TapestryModule$2.service(TapestryModule.java:892)
    at $RequestHandler_20d7f9a201899.service(Unknown Source)
    at org.apache.tapestry5.internal.services.StaticFilesFilter.service(StaticFilesFilter.java:90)
    at $RequestHandler_20d7f9a201899.service(Unknown Source)
    at org.apache.tapestry5.internal.services.CheckForUpdatesFilter$2.invoke(CheckForUpdatesFilter.java:105)
    at org.apache.tapestry5.internal.services.CheckForUpdatesFilter$2.invoke(CheckForUpdatesFilter.java:96)
    at org.apache.tapestry5.ioc.internal.util.ConcurrentBarrier.withRead(ConcurrentBarrier.java:85)
    at org.apache.tapestry5.internal.services.CheckForUpdatesFilter.service(CheckForUpdatesFilter.java:119)
    at $RequestHandler_20d7f9a201899.service(Unknown Source)
    at $RequestHandler_20d7f9a20188d.service(Unknown Source)
    at org.apache.tapestry5.services.TapestryModule$HttpServletRequestHandlerTerminator.service(TapestryModule.java:253)
    at org.got5.tapestry5.jquery.services.AjaxUploadServletRequestFilter.service(AjaxUploadServletRequestFilter.java:27)
    at $HttpServletRequestHandler_20d7f9a20188f.service(Unknown Source)
    at org.apache.tapestry5.internal.gzip.GZipFilter.service(GZipFilter.java:53)
    at $HttpServletRequestHandler_20d7f9a20188f.service(Unknown Source)
    at org.apache.tapestry5.upload.internal.services.MultipartServletRequestFilter.service(MultipartServletRequestFilter.java:44)
    at $HttpServletRequestHandler_20d7f9a20188f.service(Unknown Source)
    at org.apache.tapestry5.internal.services.IgnoredPathsFilter.service(IgnoredPathsFilter.java:62)
    at $HttpServletRequestFilter_20d7f9a20188a.service(Unknown Source)
    at $HttpServletRequestHandler_20d7f9a20188f.service(Unknown Source)
    at org.apache.tapestry5.services.TapestryModule$1.service(TapestryModule.java:852)
    at $HttpServletRequestHandler_20d7f9a20188f.service(Unknown Source)
    at $HttpServletRequestHandler_20d7f9a201888.service(Unknown Source)
    at org.apache.tapestry5.TapestryFilter.doFilter(TapestryFilter.java:171)
    at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1148)
    at org.mortbay.jetty.servlet.ServletHandler.handle(ServletHandler.java:387)
    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.ContextHandlerCollection.handle(ContextHandlerCollection.java:230)
    at org.mortbay.jetty.handler.HandlerCollection.handle(HandlerCollection.java:114)
    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$RequestHandler.content(HttpConnection.java:880)
    at org.mortbay.jetty.HttpParser.parseNext(HttpParser.java:747)
    at org.mortbay.jetty.HttpParser.parseAvailable(HttpParser.java:218)
    at org.mortbay.jetty.HttpConnection.handle(HttpConnection.java:404)
    at org.mortbay.io.nio.SelectChannelEndPoint.run(SelectChannelEndPoint.java:409)
    at org.mortbay.thread.QueuedThreadPool$PoolThread.run(QueuedThreadPool.java:520)
Caused by: org.apache.tapestry5.runtime.ComponentEventException: org.hibernate.PersistentObjectException: detached entity passed to persist: some.package.entities.Task [at classpath:some/package/components/affected/someComponent.tml, line 21]
    at org.apache.tapestry5.internal.structure.ComponentPageElementImpl.processEventTriggering(ComponentPageElementImpl.java:1141)
    at org.apache.tapestry5.internal.structure.ComponentPageElementImpl.access$3100(ComponentPageElementImpl.java:61)
    at org.apache.tapestry5.internal.structure.ComponentPageElementImpl$5.invoke(ComponentPageElementImpl.java:1062)
    at org.apache.tapestry5.internal.structure.ComponentPageElementImpl$5.invoke(ComponentPageElementImpl.java:1060)
    at org.apache.tapestry5.ioc.internal.OperationTrackerImpl.invoke(OperationTrackerImpl.java:74)
    ... 74 more
Caused by: javax.persistence.PersistenceException: org.hibernate.PersistentObjectException: detached entity passed to persist: some.package.entities.Task
    at org.hibernate.jpa.spi.AbstractEntityManagerImpl.convert(AbstractEntityManagerImpl.java:1763)
    at org.hibernate.jpa.spi.AbstractEntityManagerImpl.convert(AbstractEntityManagerImpl.java:1677)
    at org.hibernate.jpa.spi.AbstractEntityManagerImpl.convert(AbstractEntityManagerImpl.java:1683)
    at org.hibernate.jpa.spi.AbstractEntityManagerImpl.merge(AbstractEntityManagerImpl.java:1206)
    at $EntityManager_14b7d075216.merge($EntityManager_14b7d075216.java)
    at some.package.dao.AbstractDAOImpl.update(AbstractDAOImpl.java:34)
    at $TaskStatusDAO_20d7f9a2019e4.update(Unknown Source)
    at $TaskStatusDAO_20d7f9a2019e5.advised$update_20d7f9a2019eb(Unknown Source)
    at $TaskStatusDAO_20d7f9a2019e5$Invocation_update_20d7f9a2019ea.proceedToAdvisedMethod(Unknown Source)
    at org.apache.tapestry5.internal.plastic.AbstractMethodInvocation.proceed(AbstractMethodInvocation.java:84)
    at org.apache.tapestry5.internal.jpa.CommitAfterMethodAdvice.advise(CommitAfterMethodAdvice.java:48)
    at org.apache.tapestry5.internal.plastic.AbstractMethodInvocation.proceed(AbstractMethodInvocation.java:86)
    at $TaskStatusDAO_20d7f9a2019e5.update(Unknown Source)
    at $TaskStatusDAO_20d7f9a201879.update(Unknown Source)
    at some.package.components.affected.someComponent.onActionFromSendConfirmation(someComponent.java:59)
    at some.package.components.affected.someComponent.dispatchComponentEvent(someComponent.java)
    at org.apache.tapestry5.internal.structure.ComponentPageElementImpl.dispatchEvent(ComponentPageElementImpl.java:932)
    at org.apache.tapestry5.internal.structure.ComponentPageElementImpl.processEventTriggering(ComponentPageElementImpl.java:1117)
    ... 78 more
Caused by: org.hibernate.PersistentObjectException: detached entity passed to persist: some.package.entities.Task
    at org.hibernate.event.internal.DefaultPersistEventListener.onPersist(DefaultPersistEventListener.java:139)
    at org.hibernate.event.internal.DefaultPersistEventListener.onPersist(DefaultPersistEventListener.java:75)
    at org.hibernate.tuple.entity.AbstractEntityTuplizer$IncrediblySillyJpaMapsIdMappedIdentifierValueMarshaller.getIdentifier(AbstractEntityTuplizer.java:494)
    at org.hibernate.tuple.entity.AbstractEntityTuplizer.getIdentifier(AbstractEntityTuplizer.java:342)
    at org.hibernate.persister.entity.AbstractEntityPersister.getIdentifier(AbstractEntityPersister.java:4746)
    at org.hibernate.event.internal.DefaultMergeEventListener.onMerge(DefaultMergeEventListener.java:129)
    at org.hibernate.event.internal.DefaultMergeEventListener.onMerge(DefaultMergeEventListener.java:76)
    at org.hibernate.internal.SessionImpl.fireMerge(SessionImpl.java:876)
    at org.hibernate.internal.SessionImpl.merge(SessionImpl.java:858)
    at org.hibernate.internal.SessionImpl.merge(SessionImpl.java:863)
    at org.hibernate.jpa.spi.AbstractEntityManagerImpl.merge(AbstractEntityManagerImpl.java:1196)
    ... 92 more

如果我创建一个单独的标识符并且不使用复合id，则更新/合并TaskStatus会起作用。但如果我不这样做，我宁愿不改变它。

如何使用派生（？）实体来使用复合ID？

1 个答案:

答案 0 :(得分：0)

如果为每个HTTP请求创建了一个新的Hibernate会话（最有可能发生），那么您面临的问题是由于您在会话中系统地持久保存数据库中的数据（属性'someTask'） ，'someWorker'和'someStatus'）。

有什么影响：

  • 第一个HTTP请求：呈现页面

    • 创建了一个新的Hibernate会话。
    • 在此HTTP请求结束时，您的属性值存储在会话中，同时您的Hibernate会话已关闭。

  • 第二个HTTP请求：来自更新状态的操作

    • 创建了一个新的Hibernate会话。
    • Tapestry从用户会话中获取属性值，并将其重新注入组件的java属性中。但是这些值不会连接到您的新Hibernate会话，这会导致在使用其中一个调用DAO时出现错误。

要解决这个问题，我认为你应该：

  • 避免使用持久属性（我认为你不需要这样做吗？），
  • 在每个HTTP请求开始时调用DAO的“read”方法，以获得连接到Hibernate会话的全新Hibernate实体，
  • 然后在这个实体上做你的东西。
相关问题
最新问题