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使用組合的問題，我有以下實體：Tapestry 5.3.8 + Jetty + Hibernate 4.3.5 + XAMPP 1.8.3 - IdClass使用（派生）實體，它們爲什麼在嘗試合併時分離？
一些任務：
@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;
}
以及有關任務的一些情況：
@Entity
@IdClass(TaskStatusId.class)
public class TaskStatus {
@Id
@ManyToOne
private Worker worker
@Id
@ManyToOne
private Task task;
}
備註：我只有TaskStatus和其他兩個實體之間的單向關係。 Task和Worker都不包含List。
現在我有一些數據庫項目的任務和工人，和一些條目使用這些stati。這些是在應用程序啓動時創建並保留的測試對象。這一切工作正常。
現在我有一個Tapestry頁面，它可以找到一個Task和一個Worker，並將它們存儲在頁面屬性中。
SomePage.java：
@Property
@Persist
private Task someTask;
@Property
@Persist
private Worker someWorker;
SomePage.tml：
<t:someComponent selectedTask="someTask" selectedWorker="someWorker"/>
在頁面A組分接收任務和工人作爲參數，並使用我的DAO層找到既使用TaskStatus ，這也有效。
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);
}
最後，我有一個ActionLink的在做以下組件：
- 更新的TaskStatus對象日期字段
- 嘗試保存使用我的DAO層更改對象，更具體地說我的合併 - 方法：
接口：
@CommitAfter
public T update(T entity);
實現：
public T update(T entity) {
return em.merge(entity);
}
當我嘗試合併TaskStatus對象，我得到異常：
org.hibernate.PersistentObjectException:
detached entity passed to persist: some.package.Task
堆棧跟蹤：
[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
如果我創建一個分離te標識符，並且不使用複合標識，更新/合併TaskStatus工作。但是，如果我不需要，我寧願不改變它。
如何使用派生（？）實體使用複合ID？