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Author Message
b.knarf
 Post subject: NullPointerException in EntityAction.getId()
PostPosted: Sat Aug 08, 2009 12:36 pm 
Newbie

Joined: Sat Aug 08, 2009 12:00 pm
Posts: 1
Hello,

I'm getting an NPE in EntityAction.getID() in a very specific case.

Basically i have 4 types of Entities (i renamed them to clarify their Relations):
  • TOP: TOP owns a List of UPPERMIDDLE Entities (OneToMany)
  • UPPERMIDDLE: UPPERMIDDLE holds one TOP-Entity (ManyToOne) and owns a List of LOWERMIDDLE-Entities (OneToMany)
  • LOWERMIDDLE: LOWERMIDDLE holds one UPPERMIDDLE-Entity (ManyToOne) and one BOTTOM-Entity (ManyToOne)
  • BOTTOM: BOTTOM holds a Set of LOWERMIDDLE-Entities (OneToMany)

When I persist one UPPERMIDDLE -Entity connected to at least one LOWERMIDDLE-Entity (the Connections to BOTTOM and TOP are also set) and remove it during the same transaction, I get an NullpointerException in EntityAction.getId(). The NPE is thrown at FlushTime, when a LOWERMIDDLE-Entity connected to the newly persisted but now going to be removed UPPERMIDDLE-Entity should be removed.

When an UPPERMIDDLE-Entity is removed its dependent LOWERMIDDLE-Entities have to be removed and the Collections of TOP- and BOTTOM-Entities have to be updated accordingly.

The NPE only occurs in this specific case, when I remove a UPPERMIDDLE, which was persisted during the transaction and has at least one LOWERMIDDLE-Entity. All the Connections are set properly (no Constraintviolation!) an i tried multiple cascadeTypes and tried to set connections and removed Entities from the Collections properly, but the NPE is still thrown.

Everything works when i remove an UPPERMIDDLE which was already flushed to the Database ( == which was persisted during a previous session) or when i remove an UPPERMIDDLE which has no dependent LOWERMIDDLES.

I use Spring Web Flow, but it seems very unlikely, that this causes the problem.

Any Help would be appreciated.


Code:
org.springframework.transaction.TransactionSystemException: Could not commit JPA transaction; nested exception is javax.persistence.RollbackException: Error while commiting the transaction
   at org.springframework.orm.jpa.JpaTransactionManager.doCommit(JpaTransactionManager.java:465)
   at org.springframework.transaction.support.AbstractPlatformTransactionManager.processCommit(AbstractPlatformTransactionManager.java:732)
   at org.springframework.transaction.support.AbstractPlatformTransactionManager.commit(AbstractPlatformTransactionManager.java:701)
   at org.springframework.transaction.support.TransactionTemplate.execute(TransactionTemplate.java:140)
   at org.springframework.webflow.persistence.JpaFlowExecutionListener.sessionEnding(JpaFlowExecutionListener.java:128)
   at org.springframework.webflow.engine.impl.FlowExecutionListeners.fireSessionEnding(FlowExecutionListeners.java:208)
   at org.springframework.webflow.engine.impl.FlowExecutionImpl.endActiveFlowSession(FlowExecutionImpl.java:396)
   at org.springframework.webflow.engine.impl.RequestControlContextImpl.endActiveFlowSession(RequestControlContextImpl.java:238)
   at org.springframework.webflow.engine.EndState.doEnter(EndState.java:107)
   at org.springframework.webflow.engine.State.enter(State.java:194)
   at org.springframework.webflow.engine.Transition.execute(Transition.java:227)
   at org.springframework.webflow.engine.impl.FlowExecutionImpl.execute(FlowExecutionImpl.java:391)
   at org.springframework.webflow.engine.impl.RequestControlContextImpl.execute(RequestControlContextImpl.java:214)
   at org.springframework.webflow.engine.TransitionableState.handleEvent(TransitionableState.java:119)
   at org.springframework.webflow.engine.Flow.handleEvent(Flow.java:555)
   at org.springframework.webflow.engine.impl.FlowExecutionImpl.handleEvent(FlowExecutionImpl.java:386)
   at org.springframework.webflow.engine.impl.RequestControlContextImpl.handleEvent(RequestControlContextImpl.java:210)
   at org.springframework.webflow.engine.ActionState.doEnter(ActionState.java:105)
   at org.springframework.webflow.engine.State.enter(State.java:194)
   at org.springframework.webflow.engine.Transition.execute(Transition.java:227)
   at org.springframework.webflow.engine.impl.FlowExecutionImpl.execute(FlowExecutionImpl.java:391)
   at org.springframework.webflow.engine.impl.RequestControlContextImpl.execute(RequestControlContextImpl.java:214)
   at org.springframework.webflow.engine.TransitionableState.handleEvent(TransitionableState.java:119)
   at org.springframework.webflow.engine.Flow.handleEvent(Flow.java:555)
   at org.springframework.webflow.engine.impl.FlowExecutionImpl.handleEvent(FlowExecutionImpl.java:386)
   at org.springframework.webflow.engine.impl.RequestControlContextImpl.handleEvent(RequestControlContextImpl.java:210)
   at org.springframework.webflow.engine.ViewState.handleEvent(ViewState.java:230)
   at org.springframework.webflow.engine.ViewState.resume(ViewState.java:196)
   at org.springframework.webflow.engine.Flow.resume(Flow.java:545)
   at org.springframework.webflow.engine.impl.FlowExecutionImpl.resume(FlowExecutionImpl.java:259)
   ... 60 more
Caused by: javax.persistence.RollbackException: Error while commiting the transaction
   at org.hibernate.ejb.TransactionImpl.commit(TransactionImpl.java:71)
   at org.springframework.orm.jpa.JpaTransactionManager.doCommit(JpaTransactionManager.java:456)
   ... 89 more
Caused by: java.lang.NullPointerException
   at org.hibernate.action.EntityAction.getId(EntityAction.java:63)
   at org.hibernate.action.EntityDeleteAction.postDelete(EntityDeleteAction.java:122)
   at org.hibernate.action.EntityDeleteAction.execute(EntityDeleteAction.java:97)
   at org.hibernate.engine.ActionQueue.execute(ActionQueue.java:279)
   at org.hibernate.engine.ActionQueue.executeActions(ActionQueue.java:263)
   at org.hibernate.engine.ActionQueue.executeActions(ActionQueue.java:172)
   at org.hibernate.event.def.AbstractFlushingEventListener.performExecutions(AbstractFlushingEventListener.java:298)
   at org.hibernate.event.def.DefaultFlushEventListener.onFlush(DefaultFlushEventListener.java:27)
   at org.hibernate.impl.SessionImpl.flush(SessionImpl.java:1000)
   at org.hibernate.impl.SessionImpl.managedFlush(SessionImpl.java:338)
   at org.hibernate.transaction.JDBCTransaction.commit(JDBCTransaction.java:106)
   at org.hibernate.ejb.TransactionImpl.commit(TransactionImpl.java:54)
   ... 90 more
08.08.2009 17:39:32 org.apache.catalina.core.StandardWrapperValve invoke
SCHWERWIEGEND: Servlet.service() for servlet Spring MVC Dispatcher Servlet threw exception
java.lang.NullPointerException
   at org.hibernate.action.EntityAction.getId(EntityAction.java:63)
   at org.hibernate.action.EntityDeleteAction.postDelete(EntityDeleteAction.java:122)
   at org.hibernate.action.EntityDeleteAction.execute(EntityDeleteAction.java:97)
   at org.hibernate.engine.ActionQueue.execute(ActionQueue.java:279)
   at org.hibernate.engine.ActionQueue.executeActions(ActionQueue.java:263)
   at org.hibernate.engine.ActionQueue.executeActions(ActionQueue.java:172)
   at org.hibernate.event.def.AbstractFlushingEventListener.performExecutions(AbstractFlushingEventListener.java:298)
   at org.hibernate.event.def.DefaultFlushEventListener.onFlush(DefaultFlushEventListener.java:27)
   at org.hibernate.impl.SessionImpl.flush(SessionImpl.java:1000)
   at org.hibernate.impl.SessionImpl.managedFlush(SessionImpl.java:338)
   at org.hibernate.transaction.JDBCTransaction.commit(JDBCTransaction.java:106)
   at org.hibernate.ejb.TransactionImpl.commit(TransactionImpl.java:54)
   at org.springframework.orm.jpa.JpaTransactionManager.doCommit(JpaTransactionManager.java:456)
   at org.springframework.transaction.support.AbstractPlatformTransactionManager.processCommit(AbstractPlatformTransactionManager.java:732)
   at org.springframework.transaction.support.AbstractPlatformTransactionManager.commit(AbstractPlatformTransactionManager.java:701)
   at org.springframework.transaction.support.TransactionTemplate.execute(TransactionTemplate.java:140)
   at org.springframework.webflow.persistence.JpaFlowExecutionListener.sessionEnding(JpaFlowExecutionListener.java:128)
   at org.springframework.webflow.engine.impl.FlowExecutionListeners.fireSessionEnding(FlowExecutionListeners.java:208)
   at org.springframework.webflow.engine.impl.FlowExecutionImpl.endActiveFlowSession(FlowExecutionImpl.java:396)
   at org.springframework.webflow.engine.impl.RequestControlContextImpl.endActiveFlowSession(RequestControlContextImpl.java:238)
   at org.springframework.webflow.engine.EndState.doEnter(EndState.java:107)
   at org.springframework.webflow.engine.State.enter(State.java:194)
   at org.springframework.webflow.engine.Transition.execute(Transition.java:227)
   at org.springframework.webflow.engine.impl.FlowExecutionImpl.execute(FlowExecutionImpl.java:391)
   at org.springframework.webflow.engine.impl.RequestControlContextImpl.execute(RequestControlContextImpl.java:214)
   at org.springframework.webflow.engine.TransitionableState.handleEvent(TransitionableState.java:119)
   at org.springframework.webflow.engine.Flow.handleEvent(Flow.java:555)
   at org.springframework.webflow.engine.impl.FlowExecutionImpl.handleEvent(FlowExecutionImpl.java:386)
   at org.springframework.webflow.engine.impl.RequestControlContextImpl.handleEvent(RequestControlContextImpl.java:210)
   at org.springframework.webflow.engine.ActionState.doEnter(ActionState.java:105)
   at org.springframework.webflow.engine.State.enter(State.java:194)
   at org.springframework.webflow.engine.Transition.execute(Transition.java:227)
   at org.springframework.webflow.engine.impl.FlowExecutionImpl.execute(FlowExecutionImpl.java:391)
   at org.springframework.webflow.engine.impl.RequestControlContextImpl.execute(RequestControlContextImpl.java:214)
   at org.springframework.webflow.engine.TransitionableState.handleEvent(TransitionableState.java:119)
   at org.springframework.webflow.engine.Flow.handleEvent(Flow.java:555)
   at org.springframework.webflow.engine.impl.FlowExecutionImpl.handleEvent(FlowExecutionImpl.java:386)
   at org.springframework.webflow.engine.impl.RequestControlContextImpl.handleEvent(RequestControlContextImpl.java:210)
   at org.springframework.webflow.engine.ViewState.handleEvent(ViewState.java:230)
   at org.springframework.webflow.engine.ViewState.resume(ViewState.java:196)
   at org.springframework.webflow.engine.Flow.resume(Flow.java:545)
   at org.springframework.webflow.engine.impl.FlowExecutionImpl.resume(FlowExecutionImpl.java:259)
   at org.springframework.webflow.executor.FlowExecutorImpl.resumeExecution(FlowExecutorImpl.java:163)
   at org.springframework.webflow.mvc.servlet.FlowHandlerAdapter.handle(FlowHandlerAdapter.java:183)
   at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:875)
   at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:807)
   at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:571)
   at org.springframework.web.servlet.FrameworkServlet.doPost(FrameworkServlet.java:511)
   at javax.servlet.http.HttpServlet.service(HttpServlet.java:637)
   at javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
   at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290)
   at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
   at org.springframework.security.util.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:378)
   at org.springframework.security.intercept.web.FilterSecurityInterceptor.invoke(FilterSecurityInterceptor.java:109)
   at org.springframework.security.intercept.web.FilterSecurityInterceptor.doFilter(FilterSecurityInterceptor.java:83)
   at org.springframework.security.util.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:390)
   at org.springframework.security.ui.SessionFixationProtectionFilter.doFilterHttp(SessionFixationProtectionFilter.java:67)
   at org.springframework.security.ui.SpringSecurityFilter.doFilter(SpringSecurityFilter.java:53)
   at org.springframework.security.util.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:390)
   at org.springframework.security.ui.ExceptionTranslationFilter.doFilterHttp(ExceptionTranslationFilter.java:101)
   at org.springframework.security.ui.SpringSecurityFilter.doFilter(SpringSecurityFilter.java:53)
   at org.springframework.security.util.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:390)
   at org.springframework.security.providers.anonymous.AnonymousProcessingFilter.doFilterHttp(AnonymousProcessingFilter.java:105)
   at org.springframework.security.ui.SpringSecurityFilter.doFilter(SpringSecurityFilter.java:53)
   at org.springframework.security.util.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:390)
   at org.springframework.security.ui.rememberme.RememberMeProcessingFilter.doFilterHttp(RememberMeProcessingFilter.java:116)
   at org.springframework.security.ui.SpringSecurityFilter.doFilter(SpringSecurityFilter.java:53)
   at org.springframework.security.util.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:390)
   at org.springframework.security.wrapper.SecurityContextHolderAwareRequestFilter.doFilterHttp(SecurityContextHolderAwareRequestFilter.java:91)
   at org.springframework.security.ui.SpringSecurityFilter.doFilter(SpringSecurityFilter.java:53)
   at org.springframework.security.util.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:390)
   at org.springframework.security.ui.basicauth.BasicProcessingFilter.doFilterHttp(BasicProcessingFilter.java:174)
   at org.springframework.security.ui.SpringSecurityFilter.doFilter(SpringSecurityFilter.java:53)
   at org.springframework.security.util.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:390)
   at org.springframework.security.ui.AbstractProcessingFilter.doFilterHttp(AbstractProcessingFilter.java:277)
   at org.springframework.security.ui.SpringSecurityFilter.doFilter(SpringSecurityFilter.java:53)
   at org.springframework.security.util.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:390)
   at org.springframework.security.ui.logout.LogoutFilter.doFilterHttp(LogoutFilter.java:89)
   at org.springframework.security.ui.SpringSecurityFilter.doFilter(SpringSecurityFilter.java:53)
   at org.springframework.security.util.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:390)
   at org.springframework.security.context.HttpSessionContextIntegrationFilter.doFilterHttp(HttpSessionContextIntegrationFilter.java:235)
   at org.springframework.security.ui.SpringSecurityFilter.doFilter(SpringSecurityFilter.java:53)
   at org.springframework.security.util.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:390)
   at org.springframework.security.util.FilterChainProxy.doFilter(FilterChainProxy.java:175)
   at org.springframework.web.filter.DelegatingFilterProxy.invokeDelegate(DelegatingFilterProxy.java:236)
   at org.springframework.web.filter.DelegatingFilterProxy.doFilter(DelegatingFilterProxy.java:167)
   at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235)
   at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
   at org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:96)
   at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:76)
   at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235)
   at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
   at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:233)
   at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:191)
   at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:128)
   at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102)
   at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)
   at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:293)
   at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:849)
   at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:583)
   at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:454)
   at java.lang.Thread.run(Unknown Source)
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