[jboss-user] [JBoss Seam] - Re: Partial load of data for DataTable

[gvl]

Thank you for your reply,

My goal here is to avoid loading a large batch of data all at once and do a lazy load as you say.

So I tried to attach an action listener on the scroller and catch when a user hits the forward button. However I got the following NullPointerException:


  | java.lang.NullPointerException
  |         at org.jboss.ejb3.entity.ExtendedEntityManager.getPersistenceContext(ExtendedEntityManager.java:59)
  |         at org.jboss.ejb3.entity.ExtendedEntityManager.createNamedQuery(ExtendedEntityManager.java:134)
  |         at gr.aegek.invent.business.BrowseBean.loadEntities(BrowseBean.java:278)
  |         at gr.aegek.invent.business.BrowseBean.loadAll(BrowseBean.java:243)
  |         at gr.aegek.invent.business.material.BrowseMaterialsBean.load(BrowseMaterialsBean.java:129)
  |         at gr.aegek.invent.business.ScrollerActionListener.processAction(ScrollerActionListener.java:43)
  |         at javax.faces.event.ActionEvent.processListener(ActionEvent.java:48)
  |         at javax.faces.component.UIComponentBase.broadcast(UIComponentBase.java:484)
  |         at org.apache.myfaces.custom.datascroller.HtmlDataScroller.broadcast(HtmlDataScroller.java:104)
  |         at javax.faces.component.UIViewRoot._broadcastForPhase(UIViewRoot.java:94)
  |         at javax.faces.component.UIViewRoot.processApplication(UIViewRoot.java:168)
  |         at org.apache.myfaces.lifecycle.LifecycleImpl.invokeApplication(LifecycleImpl.java:343)
  |         at org.apache.myfaces.lifecycle.LifecycleImpl.execute(LifecycleImpl.java:86)
  |         at javax.faces.webapp.FacesServlet.service(FacesServlet.java:137)
  |         at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:252)
  |         at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:173)
  |         at org.apache.myfaces.webapp.filter.ExtensionsFilter.doFilter(ExtensionsFilter.java:144)
  |         at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:202)
  |         at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:173)
  |         at org.jboss.seam.servlet.SeamRedirectFilter.doFilter(SeamRedirectFilter.java:30)
  |         at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:202)
  |         at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:173)
  |         at org.jboss.seam.servlet.SeamExceptionFilter.doFilter(SeamExceptionFilter.java:45)
  |         at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:202)
  |         at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:173)
  |         at org.jboss.web.tomcat.filters.ReplyHeaderFilter.doFilter(ReplyHeaderFilter.java:96)
  |         at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:202)
  |         at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:173)
  |         at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:213)
  |         at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:178)
  |         at org.jboss.web.tomcat.security.SecurityAssociationValve.invoke(SecurityAssociationValve.java:175)
  |         at org.jboss.web.tomcat.security.JaccContextValve.invoke(JaccContextValve.java:74)
  |         at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:126)
  |         at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:105)
  |         at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:107)
  |         at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:148)
  |         at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:869)
  |         at org.apache.coyote.http11.Http11BaseProtocol$Http11ConnectionHandler.processConnection(Http11BaseProtocol.java:664)
  |         at org.apache.tomcat.util.net.PoolTcpEndpoint.processSocket(PoolTcpEndpoint.java:527)
  |         at org.apache.tomcat.util.net.MasterSlaveWorkerThread.run(MasterSlaveWorkerThread.java:112)
  |         at java.lang.Thread.run(Thread.java:595)
  | 

I am using an extended entity manager:


  | 	@PersistenceContext (type=PersistenceContextType.EXTENDED)
  | 	protected EntityManager manager;
  | 

I am not quite sure what is wrong then here!



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