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Forum locked This topic is locked, you cannot edit posts or make further replies.  [ 1 post ] 
Author Message
 Post subject: NullPointerException with Session on DOM4J entityMode
PostPosted: Thu Mar 24, 2011 12:28 pm 
Newbie

Joined: Thu Mar 24, 2011 12:01 pm
Posts: 1
Hi to everyone,

I'm working on a Java 1.6, Spring 2.5, JSF web application. I use Hibernate 3.

I need to get the results from the database as DOM Elements.

The query works properly when I debug and I get the correct results, but when the lifecycle refresh the screen I got a nullpointer exception from SessionImpl.write:

java.lang.NullPointerException
org.hibernate.impl.SessionImpl.writeObject(SessionImpl.java:1948)

After some investigation I found out that calling session.getSession(EntityMode.DOM4J); on the main session object return me an instance of SessionImpl which attribute connectionReleaseMode = null. This cause the exception to fire in the write method.

Now I tryed a manual fix adding a setConnectionReleaseMode to SessionImpl and setting that attribute manually fix the issue for me, but honestly I don't know if this is a problem of interation with Spring or more likely I'm doing something wrong on that call. I don't know for instance why the write method is called for that dom4jSession.

It should be a serialization issue but why an attribute setted to null in the SessionImpl(SessionImpl parent, EntityMode entityMode) contructor is not checked for null in the write method? shouldn't it be, like for other attributes, this.connectionReleaseMode = parent.connectionReleaseMode?

Have you any idea? following my stacktrace and the relevant code.

Thank you in advance,

Mattia

The relevant code is:
Code:
public class ReportDefinitionDaoImpl extends HibernateDaoSupport {
...
public ReportDefinitionImpl readReportDefinition(String reportName)
   {
      Session session = this.getSession();
      Session dom4jSession = session.getSession(EntityMode.DOM4J);
      Document doc = DocumentHelper.createDocument();
      ReportDefinitionImpl reportDefinition = new ReportDefinitionImpl();

      List results = dom4jSession.createQuery("from Report r where r.name = :reportName").setParameter("reportName",
                  reportName).list();
      for (int i = 0; i < results.size(); i++) {
         Element report = (Element)results.get(i);
         report.setDocument(doc);
         doc.add(report);
      }

      reportDefinition.setDoc(doc);
      return reportDefinition;
   }



Stacktrace
Code:
java.lang.NullPointerException
   at org.hibernate.impl.SessionImpl.writeObject(SessionImpl.java:1948)
   at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
   at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
   at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
   at java.lang.reflect.Method.invoke(Unknown Source)
   at java.io.ObjectStreamClass.invokeWriteObject(Unknown Source)
   at java.io.ObjectOutputStream.writeSerialData(Unknown Source)
   at java.io.ObjectOutputStream.writeOrdinaryObject(Unknown Source)
   at java.io.ObjectOutputStream.writeObject0(Unknown Source)
   at java.io.ObjectOutputStream.writeObject(Unknown Source)
   at java.util.HashMap.writeObject(Unknown Source)
   at sun.reflect.GeneratedMethodAccessor47.invoke(Unknown Source)
   at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
   at java.lang.reflect.Method.invoke(Unknown Source)
   at java.io.ObjectStreamClass.invokeWriteObject(Unknown Source)
   at java.io.ObjectOutputStream.writeSerialData(Unknown Source)
   at java.io.ObjectOutputStream.writeOrdinaryObject(Unknown Source)
   at java.io.ObjectOutputStream.writeObject0(Unknown Source)
   at java.io.ObjectOutputStream.writeObject(Unknown Source)
   at org.hibernate.impl.SessionImpl.writeObject(SessionImpl.java:1970)
   at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
   at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
   at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
   at java.lang.reflect.Method.invoke(Unknown Source)
   at java.io.ObjectStreamClass.invokeWriteObject(Unknown Source)
   at java.io.ObjectOutputStream.writeSerialData(Unknown Source)
   at java.io.ObjectOutputStream.writeOrdinaryObject(Unknown Source)
   at java.io.ObjectOutputStream.writeObject0(Unknown Source)
   at java.io.ObjectOutputStream.writeObject(Unknown Source)
   at java.util.HashMap.writeObject(Unknown Source)
   at sun.reflect.GeneratedMethodAccessor47.invoke(Unknown Source)
   at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
   at java.lang.reflect.Method.invoke(Unknown Source)
   at java.io.ObjectStreamClass.invokeWriteObject(Unknown Source)
   at java.io.ObjectOutputStream.writeSerialData(Unknown Source)
   at java.io.ObjectOutputStream.writeOrdinaryObject(Unknown Source)
   at java.io.ObjectOutputStream.writeObject0(Unknown Source)
   at java.io.ObjectOutputStream.defaultWriteFields(Unknown Source)
   at java.io.ObjectOutputStream.defaultWriteObject(Unknown Source)
   at org.springframework.webflow.core.collection.LocalAttributeMap.writeObject(LocalAttributeMap.java:327)
   at sun.reflect.GeneratedMethodAccessor62.invoke(Unknown Source)
   at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
   at java.lang.reflect.Method.invoke(Unknown Source)
   at java.io.ObjectStreamClass.invokeWriteObject(Unknown Source)
   at java.io.ObjectOutputStream.writeSerialData(Unknown Source)
   at java.io.ObjectOutputStream.writeOrdinaryObject(Unknown Source)
   at java.io.ObjectOutputStream.writeObject0(Unknown Source)
   at java.io.ObjectOutputStream.writeObject(Unknown Source)
   at org.springframework.webflow.engine.impl.FlowSessionImpl.writeExternal(FlowSessionImpl.java:154)
   at java.io.ObjectOutputStream.writeExternalData(Unknown Source)
   at java.io.ObjectOutputStream.writeOrdinaryObject(Unknown Source)
   at java.io.ObjectOutputStream.writeObject0(Unknown Source)
   at java.io.ObjectOutputStream.writeObject(Unknown Source)
   at java.util.LinkedList.writeObject(Unknown Source)
   at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
   at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
   at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
   at java.lang.reflect.Method.invoke(Unknown Source)
   at java.io.ObjectStreamClass.invokeWriteObject(Unknown Source)
   at java.io.ObjectOutputStream.writeSerialData(Unknown Source)
   at java.io.ObjectOutputStream.writeOrdinaryObject(Unknown Source)
   at java.io.ObjectOutputStream.writeObject0(Unknown Source)
   at java.io.ObjectOutputStream.writeObject(Unknown Source)
   at org.springframework.webflow.engine.impl.FlowExecutionImpl.writeExternal(FlowExecutionImpl.java:519)
   at java.io.ObjectOutputStream.writeExternalData(Unknown Source)
   at java.io.ObjectOutputStream.writeOrdinaryObject(Unknown Source)
   at java.io.ObjectOutputStream.writeObject0(Unknown Source)
   at java.io.ObjectOutputStream.writeObject(Unknown Source)
   at org.springframework.webflow.execution.repository.snapshot.SerializedFlowExecutionSnapshot.serialize(SerializedFlowExecutionSnapshot.java:172)
   at org.springframework.webflow.execution.repository.snapshot.SerializedFlowExecutionSnapshot.<init>(SerializedFlowExecutionSnapshot.java:69)
   at org.springframework.webflow.execution.repository.snapshot.SerializedFlowExecutionSnapshotFactory.createSnapshot(SerializedFlowExecutionSnapshotFactory.java:70)
   at org.springframework.webflow.execution.repository.snapshot.AbstractSnapshottingFlowExecutionRepository.snapshot(AbstractSnapshottingFlowExecutionRepository.java:75)
   at org.springframework.webflow.execution.repository.impl.DefaultFlowExecutionRepository.updateFlowExecutionSnapshot(DefaultFlowExecutionRepository.java:128)
   at org.springframework.webflow.engine.impl.FlowExecutionImpl.updateCurrentFlowExecutionSnapshot(FlowExecutionImpl.java:409)
   at org.springframework.webflow.engine.impl.RequestControlContextImpl.updateCurrentFlowExecutionSnapshot(RequestControlContextImpl.java:209)
   at org.springframework.webflow.engine.ViewState.updateHistory(ViewState.java:283)
   at org.springframework.webflow.engine.ViewState.exit(ViewState.java:223)
   at org.springframework.webflow.engine.Transition.execute(Transition.java:224)
   at org.springframework.webflow.engine.impl.FlowExecutionImpl.execute(FlowExecutionImpl.java:378)
   at org.springframework.webflow.engine.impl.RequestControlContextImpl.execute(RequestControlContextImpl.java:201)
   at org.springframework.webflow.engine.TransitionableState.handleEvent(TransitionableState.java:119)
   at org.springframework.webflow.engine.Flow.handleEvent(Flow.java:561)
   at org.springframework.webflow.engine.impl.FlowExecutionImpl.handleEvent(FlowExecutionImpl.java:373)
   at org.springframework.webflow.engine.impl.RequestControlContextImpl.handleEvent(RequestControlContextImpl.java:197)
   at org.springframework.webflow.engine.ViewState.resume(ViewState.java:206)
   at org.springframework.webflow.engine.Flow.resume(Flow.java:551)
   at org.springframework.webflow.engine.impl.FlowExecutionImpl.resume(FlowExecutionImpl.java:263)
   at org.springframework.webflow.executor.FlowExecutorImpl.resumeExecution(FlowExecutorImpl.java:153)
   at org.springframework.webflow.mvc.servlet.FlowHandlerAdapter.handle(FlowHandlerAdapter.java:173)
   at org.springframework.webflow.mvc.servlet.FlowController.handleRequest(FlowController.java:172)
   at org.springframework.web.servlet.mvc.SimpleControllerHandlerAdapter.handle(SimpleControllerHandlerAdapter.java:48)
   at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:875)
   at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:809)
   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.apache.myfaces.webapp.filter.ExtensionsFilter.doFilter(ExtensionsFilter.java:147)
   at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235)
   at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
   at org.springframework.security.util.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:359)
   at org.springframework.security.intercept.web.FilterSecurityInterceptor.invoke(FilterSecurityInterceptor.java:109)
   at org.springframework.security.intercept.web.FilterSecurityInterceptor.doFilter(FilterSecurityInterceptor.java:83)
   at org.springframework.security.util.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:371)
   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$VirtualFilterChain.doFilter(FilterChainProxy.java:371)
   at org.springframework.security.ui.ExceptionTranslationFilter.doFilterHttp(ExceptionTranslationFilter.java:101)
   at org.springframework.security.ui.SpringSecurityFilter.doFilter(SpringSecurityFilter.java:53)
   at org.springframework.security.util.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:371)
   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$VirtualFilterChain.doFilter(FilterChainProxy.java:371)
   at org.springframework.security.wrapper.SecurityContextHolderAwareRequestFilter.doFilterHttp(SecurityContextHolderAwareRequestFilter.java:91)
   at org.springframework.security.ui.SpringSecurityFilter.doFilter(SpringSecurityFilter.java:53)
   at org.springframework.security.util.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:371)
   at org.springframework.security.ui.basicauth.BasicProcessingFilter.doFilterHttp(BasicProcessingFilter.java:173)
   at org.springframework.security.ui.SpringSecurityFilter.doFilter(SpringSecurityFilter.java:53)
   at org.springframework.security.util.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:371)
   at org.springframework.security.ui.AbstractProcessingFilter.doFilterHttp(AbstractProcessingFilter.java:271)
   at org.springframework.security.ui.SpringSecurityFilter.doFilter(SpringSecurityFilter.java:53)
   at org.springframework.security.util.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:371)
   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$VirtualFilterChain.doFilter(FilterChainProxy.java:371)
   at org.springframework.security.context.HttpSessionContextIntegrationFilter.doFilterHttp(HttpSessionContextIntegrationFilter.java:235)
   at org.springframework.security.ui.SpringSecurityFilter.doFilter(SpringSecurityFilter.java:53)
   at org.springframework.security.util.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:371)
   at org.springframework.security.util.FilterChainProxy.doFilter(FilterChainProxy.java:174)
   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.openfaces.util.ResourceFilter.doFilter(ResourceFilter.java:98)
   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:286)
   at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:845)
   at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:583)
   at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:447)
   at java.lang.Thread.run(Unknown Source)
t java.lang.reflect.Method.invoke(Unknown Source)
   at java.io.ObjectStreamClass.invokeWriteObject(Unknown Source)
   at java.io.ObjectOutputStream.writeSerialData(Unknown Source)
   at java.io.ObjectOutputStream.writeOrdinaryObject(Unknown Source)
   at java.io.ObjectOutputStream.writeObject0(Unknown Source)
   at java.io.ObjectOutputStream.writeObject(Unknown Source)
   at java.util.HashMap.writeObject(Unknown Source)
   at sun.reflect.GeneratedMethodAccessor47.invoke(Unknown Source)
   at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
   at java.lang.reflect.Method.invoke(Unknown Source)
   at java.io.ObjectStreamClass.invokeWriteObject(Unknown Source)
   at java.io.ObjectOutputStream.writeSerialData(Unknown Source)
   at java.io.ObjectOutputStream.writeOrdinaryObject(Unknown Source)
   at java.io.ObjectOutputStream.writeObject0(Unknown Source)
   at java.io.ObjectOutputStream.writeObject(Unknown Source)
   at org.hibernate.impl.SessionImpl.writeObject(SessionImpl.java:1970)
   at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
   at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
   at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
   at java.lang.reflect.Method.invoke(Unknown Source)
   at java.io.ObjectStreamClass.invokeWriteObject(Unknown Source)
   at java.io.ObjectOutputStream.writeSerialData(Unknown Source)
   at java.io.ObjectOutputStream.writeOrdinaryObject(Unknown Source)
   at java.io.ObjectOutputStream.writeObject0(Unknown Source)
   at java.io.ObjectOutputStream.writeObject(Unknown Source)
   at java.util.HashMap.writeObject(Unknown Source)
   at sun.reflect.GeneratedMethodAccessor47.invoke(Unknown Source)
   at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
   at java.lang.reflect.Method.invoke(Unknown Source)
   at java.io.ObjectStreamClass.invokeWriteObject(Unknown Source)
   at java.io.ObjectOutputStream.writeSerialData(Unknown Source)
   at java.io.ObjectOutputStream.writeOrdinaryObject(Unknown Source)
   at java.io.ObjectOutputStream.writeObject0(Unknown Source)
   at java.io.ObjectOutputStream.defaultWriteFields(Unknown Source)
   at java.io.ObjectOutputStream.defaultWriteObject(Unknown Source)
   at org.springframework.webflow.core.collection.LocalAttributeMap.writeObject(LocalAttributeMap.java:327)
   at sun.reflect.GeneratedMethodAccessor62.invoke(Unknown Source)
   at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
   at java.lang.reflect.Method.invoke(Unknown Source)
   at java.io.ObjectStreamClass.invokeWriteObject(Unknown Source)
   at java.io.ObjectOutputStream.writeSerialData(Unknown Source)
   at java.io.ObjectOutputStream.writeOrdinaryObject(Unknown Source)
   at java.io.ObjectOutputStream.writeObject0(Unknown Source)
   at java.io.ObjectOutputStream.writeObject(Unknown Source)
   at org.springframework.webflow.engine.impl.FlowSessionImpl.writeExternal(FlowSessionImpl.java:154)
   at java.io.ObjectOutputStream.writeExternalData(Unknown Source)
   at java.io.ObjectOutputStream.writeOrdinaryObject(Unknown Source)
   at java.io.ObjectOutputStream.writeObject0(Unknown Source)
   at java.io.ObjectOutputStream.writeObject(Unknown Source)
   at java.util.LinkedList.writeObject(Unknown Source)
   at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
   at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
   at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
   at java.lang.reflect.Method.invoke(Unknown Source)
   at java.io.ObjectStreamClass.invokeWriteObject(Unknown Source)
   at java.io.ObjectOutputStream.writeSerialData(Unknown Source)
   at java.io.ObjectOutputStream.writeOrdinaryObject(Unknown Source)
   at java.io.ObjectOutputStream.writeObject0(Unknown Source)
   at java.io.ObjectOutputStream.writeObject(Unknown Source)
   at org.springframework.webflow.engine.impl.FlowExecutionImpl.writeExternal(FlowExecutionImpl.java:519)
   at java.io.ObjectOutputStream.writeExternalData(Unknown Source)
   at java.io.ObjectOutputStream.writeOrdinaryObject(Unknown Source)
   at java.io.ObjectOutputStream.writeObject0(Unknown Source)
   at java.io.ObjectOutputStream.writeObject(Unknown Source)
   at org.springframework.webflow.execution.repository.snapshot.SerializedFlowExecutionSnapshot.serialize(SerializedFlowExecutionSnapshot.java:172)
   at org.springframework.webflow.execution.repository.snapshot.SerializedFlowExecutionSnapshot.<init>(SerializedFlowExecutionSnapshot.java:69)
   at org.springframework.webflow.execution.repository.snapshot.SerializedFlowExecutionSnapshotFactory.createSnapshot(SerializedFlowExecutionSnapshotFactory.java:70)
   at org.springframework.webflow.execution.repository.snapshot.AbstractSnapshottingFlowExecutionRepository.snapshot(AbstractSnapshottingFlowExecutionRepository.java:75)
   at org.springframework.webflow.execution.repository.impl.DefaultFlowExecutionRepository.updateFlowExecutionSnapshot(DefaultFlowExecutionRepository.java:128)
   at org.springframework.webflow.engine.impl.FlowExecutionImpl.updateCurrentFlowExecutionSnapshot(FlowExecutionImpl.java:409)
   at org.springframework.webflow.engine.impl.RequestControlContextImpl.updateCurrentFlowExecutionSnapshot(RequestControlContextImpl.java:209)
   at org.springframework.webflow.engine.ViewState.updateHistory(ViewState.java:283)
   at org.springframework.webflow.engine.ViewState.exit(ViewState.java:223)
   at org.springframework.webflow.engine.Transition.execute(Transition.java:224)
   at org.springframework.webflow.engine.impl.FlowExecutionImpl.execute(FlowExecutionImpl.java:378)
   at org.springframework.webflow.engine.impl.RequestControlContextImpl.execute(RequestControlContextImpl.java:201)
   at org.springframework.webflow.engine.TransitionableState.handleEvent(TransitionableState.java:119)
   at org.springframework.webflow.engine.Flow.handleEvent(Flow.java:561)
   at org.springframework.webflow.engine.impl.FlowExecutionImpl.handleEvent(FlowExecutionImpl.java:373)
   at org.springframework.webflow.engine.impl.RequestControlContextImpl.handleEvent(RequestControlContextImpl.java:197)
   at org.springframework.webflow.engine.ViewState.resume(ViewState.java:206)
   at org.springframework.webflow.engine.Flow.resume(Flow.java:551)
   at org.springframework.webflow.engine.impl.FlowExecutionImpl.resume(FlowExecutionImpl.java:263)
   ... 61 more


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