need to understand transaction:ejb-transaction

[mars1412]

according to the seam reference I use <transaction:ejb-transaction/> in my components.xml (I use JBoss 4.2).

When I use this, then I get the following exception when I try to access the database after the INVOKE_APPLICATION phase:

12:10:18,547 ERROR [SynchronizationRegistry] Exception processing transaction Synchronization after completion
....
Caused by: javax.transaction.NotSupportedException

It seems to me that the 2 transactions per request stuff is not working anylonger if I install the EJB synchronization component.

Any ideas?

[pmuir]

Many examples use this e.g. the booking example.

As ever, it's hard to help unless you post the whole stack trace.

[mars1412]

I just didn't want to bother you with all the details :)

here is my usecase:

I am using an eventscoped entity home object. Its Id is set via a page parameter.

this entity has a list of sub-entities which I use in a datatable that has a rich:datascroller attached.
the datascroller is bound another event-scoped seam bean (RichDataScrollerHelper), which has a method that observes the afterTransactionSuccess event and it may change the page of the datascroller.

the setPage method of the datascroller-component must access the datamodel (and thus the enityhome bean).

I am not sure why this exception is happening when I use ejb-transaction syncronization.

I guess it's like this:
when I call the remove-function of the entity-home, the EBJ container starts a transaction. then I remove the entity and the afterTransactionSuccess is queued. now the EJB container commits this transaction.
After that seam processes the events.
I see that the exception happens after INVOKE_APPLICATION phase, but before RENDER_RESPONSE phase.

Now my obserer method on RichDataScrollerHelper is called and tries to access the database again. But this seems not to be allowed when using ejb-transaction.

here's the complete stack trace:

14:01:22,538 INFO  [STDOUT] Hibernate: 
    delete 
    from
        ImageThumbnail 
    where
        id=? 
        and version=?
14:01:22,553 INFO  [DebugObserver] JSF phase: after  INVOKE_APPLICATION 5
14:01:22,584 ERROR [SynchronizationRegistry] Exception processing transaction Synchronization after completion
javax.faces.FacesException: javax.el.ELException: /private/users/gallery/user_galleries.xhtml @36,85 value="#{webUserGalleriesHome.instance.
webUser_Galleries}": Error reading 'instance' on type com.twentyfouract.web.session.WebUserGalleriesHome_$$_javassist_11
     at javax.faces.component.UIData.getValue(UIData.java:585)
     at org.ajax4jsf.component.UIDataAdaptor.getValue(UIDataAdaptor.java:1459)
     at org.ajax4jsf.component.SequenceDataAdaptor.getDataModel(SequenceDataAdaptor.java:70)
     at org.ajax4jsf.component.SequenceDataAdaptor.createDataModel(SequenceDataAdaptor.java:64)
     at org.ajax4jsf.component.UIDataAdaptor.getExtendedDataModel(UIDataAdaptor.java:592)
     at org.ajax4jsf.component.UIDataAdaptor.getRowCount(UIDataAdaptor.java:233)
     at org.richfaces.component.UIDatascroller.getRowCount(UIDatascroller.java:365)
     at org.richfaces.component.UIDatascroller.getPageCount(UIDatascroller.java:344)
     at org.richfaces.component.UIDatascroller.getPageCount(UIDatascroller.java:361)
     at com.twentyfouract.web.ui.RichDataScrollerHelper.checkPages(RichDataScrollerHelper.java:43)
     at com.twentyfouract.web.ui.RichDataScrollerHelper.checkPages(RichDataScrollerHelper.java:56)
     at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
     at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
     at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
     at java.lang.reflect.Method.invoke(Method.java:597)
     at org.jboss.seam.util.Reflections.invoke(Reflections.java:21)
     at org.jboss.seam.util.Reflections.invokeAndWrap(Reflections.java:125)
     at org.jboss.seam.Component.callComponentMethod(Component.java:2082)
     at org.jboss.seam.core.Events.raiseEvent(Events.java:84)
     at org.jboss.seam.async.AsynchronousEvent.call(AsynchronousEvent.java:27)
     at org.jboss.seam.async.Asynchronous.executeInContexts(Asynchronous.java:76)
     at org.jboss.seam.async.Asynchronous.execute(Asynchronous.java:45)
     at org.jboss.seam.async.TransactionSuccessEvent.afterCompletion(TransactionSuccessEvent.java:24)
     at org.jboss.seam.transaction.SynchronizationRegistry.afterTransactionCompletion(SynchronizationRegistry.java:42)
     at org.jboss.seam.transaction.EjbSynchronizations.afterCompletion(EjbSynchronizations.java:80)
     at org.jboss.ejb3.stateful.SessionSynchronizationInterceptor$SFSBSessionSynchronization.afterCompletion(SessionSynchronizationInterceptor.j
ava:87)
     at com.arjuna.ats.internal.jta.resources.arjunacore.SynchronizationImple.afterCompletion(SynchronizationImple.java:136)
     at com.arjuna.ats.arjuna.coordinator.TwoPhaseCoordinator.afterCompletion(TwoPhaseCoordinator.java:342)
     at com.arjuna.ats.arjuna.coordinator.TwoPhaseCoordinator.end(TwoPhaseCoordinator.java:95)
     at com.arjuna.ats.arjuna.AtomicAction.commit(AtomicAction.java:177)
     at com.arjuna.ats.internal.jta.transaction.arjunacore.TransactionImple.commitAndDisassociate(TransactionImple.java:1256)
     at com.arjuna.ats.internal.jta.transaction.arjunacore.BaseTransaction.commit(BaseTransaction.java:135)
     at com.arjuna.ats.jbossatx.BaseTransactionManagerDelegate.commit(BaseTransactionManagerDelegate.java:87)
     at org.jboss.tm.usertx.client.ServerVMClientUserTransaction.commit(ServerVMClientUserTransaction.java:140)
     at org.jboss.seam.transaction.UTTransaction.commit(UTTransaction.java:52)
     at org.jboss.seam.jsf.SeamPhaseListener.commitOrRollback(SeamPhaseListener.java:592)
     at org.jboss.seam.jsf.SeamPhaseListener.handleTransactionsAfterPhase(SeamPhaseListener.java:330)
     at org.jboss.seam.jsf.SeamPhaseListener.afterServletPhase(SeamPhaseListener.java:231)
     at org.jboss.seam.jsf.SeamPhaseListener.afterPhase(SeamPhaseListener.java:182)
     at com.sun.faces.lifecycle.LifecycleImpl.phase(LifecycleImpl.java:280)
     at com.sun.faces.lifecycle.LifecycleImpl.execute(LifecycleImpl.java:117)
     at javax.faces.webapp.FacesServlet.service(FacesServlet.java:244)
     at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290)
     at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
     at org.jboss.seam.servlet.SeamFilter$FilterChainImpl.doFilter(SeamFilter.java:83)
     at org.jboss.seam.web.MultipartFilter.doFilter(MultipartFilter.java:85)
     at org.jboss.seam.servlet.SeamFilter$FilterChainImpl.doFilter(SeamFilter.java:69)
     at org.jboss.seam.web.ExceptionFilter.doFilter(ExceptionFilter.java:64)
     at org.jboss.seam.servlet.SeamFilter$FilterChainImpl.doFilter(SeamFilter.java:69)
     at org.jboss.seam.web.RedirectFilter.doFilter(RedirectFilter.java:45)
     at org.jboss.seam.servlet.SeamFilter$FilterChainImpl.doFilter(SeamFilter.java:69)
     at org.jboss.seam.servlet.SeamFilter$FilterChainImpl.doFilter(SeamFilter.java:73)
     at org.ajax4jsf.webapp.BaseXMLFilter.doXmlFilter(BaseXMLFilter.java:141)
     at org.ajax4jsf.webapp.BaseFilter.doFilter(BaseFilter.java:281)
     at org.jboss.seam.web.Ajax4jsfFilter.doFilter(Ajax4jsfFilter.java:60)
     at org.jboss.seam.servlet.SeamFilter$FilterChainImpl.doFilter(SeamFilter.java:69)
     at org.jboss.seam.web.LoggingFilter.doFilter(LoggingFilter.java:58)
     at org.jboss.seam.servlet.SeamFilter$FilterChainImpl.doFilter(SeamFilter.java:69)
     at org.jboss.seam.debug.hot.HotDeployFilter.doFilter(HotDeployFilter.java:68)
     at org.jboss.seam.servlet.SeamFilter$FilterChainImpl.doFilter(SeamFilter.java:69)
     at org.jboss.seam.servlet.SeamFilter.doFilter(SeamFilter.java:158)
     at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235)
     at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
     at org.jboss.web.tomcat.filters.ReplyHeaderFilter.doFilter(ReplyHeaderFilter.java:96)
     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:230)
     at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:175)
     at org.jboss.web.tomcat.security.SecurityAssociationValve.invoke(SecurityAssociationValve.java:179)
     at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:433)
     at org.jboss.web.tomcat.security.JaccContextValve.invoke(JaccContextValve.java:84)
     at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:128)
     at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:104)
     at org.jboss.web.tomcat.service.jca.CachedConnectionValve.invoke(CachedConnectionValve.java:156)
     at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)
     at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:241)
     at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:844)
     at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:580)
     at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:447)
     at java.lang.Thread.run(Thread.java:619)
Caused by: javax.el.ELException: /private/users/gallery/user_galleries.xhtml @36,85 value="#{webUserGalleriesHome.instance.webUser_Galleries
}": Error reading 'instance' on type com.twentyfouract.web.session.WebUserGalleriesHome_$$_javassist_11
     at com.sun.facelets.el.TagValueExpression.getValue(TagValueExpression.java:76)
     at javax.faces.component.UIData.getValue(UIData.java:582)
     ... 79 more
Caused by: javax.transaction.NotSupportedException
     at com.arjuna.ats.internal.jta.transaction.arjunacore.BaseTransaction.begin(BaseTransaction.java:79)
     at com.arjuna.ats.jbossatx.BaseTransactionManagerDelegate.begin(BaseTransactionManagerDelegate.java:77)
     at org.jboss.tm.usertx.client.ServerVMClientUserTransaction.begin(ServerVMClientUserTransaction.java:124)
     at org.jboss.seam.transaction.UTTransaction.begin(UTTransaction.java:39)
     at org.jboss.seam.util.Work.workInTransaction(Work.java:35)
     at org.jboss.seam.transaction.TransactionInterceptor.aroundInvoke(TransactionInterceptor.java:32)
     at org.jboss.seam.intercept.SeamInvocationContext.proceed(SeamInvocationContext.java:68)
     at org.jboss.seam.core.MethodContextInterceptor.aroundInvoke(MethodContextInterceptor.java:42)
     at org.jboss.seam.intercept.SeamInvocationContext.proceed(SeamInvocationContext.java:68)
     at org.jboss.seam.intercept.RootInterceptor.invoke(RootInterceptor.java:107)
     at org.jboss.seam.intercept.JavaBeanInterceptor.interceptInvocation(JavaBeanInterceptor.java:166)
     at org.jboss.seam.intercept.JavaBeanInterceptor.invoke(JavaBeanInterceptor.java:102)
     at com.twentyfouract.web.session.WebUserGalleriesHome_$$_javassist_11.getInstance(WebUserGalleriesHome_$$_javassist_11.java)
     at sun.reflect.GeneratedMethodAccessor278.invoke(Unknown Source)
     at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
     at java.lang.reflect.Method.invoke(Method.java:597)
     at javax.el.BeanELResolver.getValue(BeanELResolver.java:62)
     at javax.el.CompositeELResolver.getValue(CompositeELResolver.java:53)
     at com.sun.faces.el.FacesCompositeELResolver.getValue(FacesCompositeELResolver.java:64)
     at org.jboss.el.parser.AstPropertySuffix.getValue(AstPropertySuffix.java:53)
     at org.jboss.el.parser.AstValue.getValue(AstValue.java:67)
     at org.jboss.el.ValueExpressionImpl.getValue(ValueExpressionImpl.java:186)
     at com.sun.facelets.el.TagValueExpression.getValue(TagValueExpression.java:71)
     ... 80 more
14:01:22,600 INFO  [DebugObserver] JSF phase: before RENDER_RESPONSE 6
14:01:22,615 INFO  [STDOUT] Hibernate: 
    select

hmm... the select in the RENDER_RESPONSE phase works fine...

[pmuir]

Yes, I guess this falls into the gap between the two transactions.

Can we see the component which includes the @Observer (including any class level/method level annotations)?

[mars1412]

sure, here are the relevant code parts:

@Name("richDataScrollerHelper")
@BypassInterceptors
public class RichDataScrollerHelper{

     UIDatascroller dataScroller2;

     public UIDatascroller getDataScroller2() {
         return dataScroller2;
    }

     public void setDataScroller2(UIDatascroller dataScroller2) {
         this.dataScroller2 = dataScroller2;
    }

     public void checkPages(UIDatascroller ds) {
          if (ds == null) {
               return;
          }
          int pageCount = ds.getPageCount();
          int pageIndex = ds.getPageIndex();
          if (pageIndex > pageCount) {
               ds.setPage(UIDatascroller.LAST_FACET_NAME);
          }
     }
     
     /**
      * if the current page is greater than the maximum pages we have,
      * we go to the last page
      */
     @Observer("org.jboss.seam.afterTransactionSuccess")
     public void checkPages() {
          checkPages(dataScroller);
     }
     
}

here is the JSF binding of the datascroller:

<rich:dataGrid id="gallery_datagrid" value="#{galleryHome.instance.imageMetaInfos}" 
                  var="gallery_imageMetaInfo" columns="2" elements="4">
     <f:facet name="header">
         <rich:datascroller renderIfSinglePage="false" binding="#{richDataScrollerHelper.dataScroller2}"/>
    </f:facet>

[pmuir]

Try adding @Transactional - then Seam can begin a transaction if necessary.

[mars1412]

still the same exception..

     @Observer("org.jboss.seam.afterTransactionSuccess")
     @Transactional
     public void checkPages() {
          checkPages(dataScroller2);
     }

[mars1412]

any other ideas, or should I raise a jira for this?

[christophea]

Any news on that ?

I am experiencing the same exception:

javax.transaction.NotSupportedException

with similar situation :

@Observer("org.jboss.seam.afterTransactionSuccess")
public void refresh() 
{
  load();
}

@Transactional
public void load()
{
  result = em.createQuery(query).getResultList();
} 

[mars1412]

we switched to spring and GWT - so: no more news from me...

[christophea]

Really (too) bad...