[jboss-user] [JBoss Seam] - Conversation problem: how to null variable?

[miloslav.vlach]

Hi all,

I have 2 same entities in the seam component:


  | @In(required=false, scope=ScopeType.CONVERSATION)
  | @Out(required=false, scope=ScopeType.CONVERSATION)
  | Category selectedCategory;
  | 
  | @In(required=false)
  | Category category;
  | 

I get exception:


  | javax.faces.el.PropertyNotFoundException: Base is null: selectedCategory
  |         at org.apache.myfaces.el.ValueBindingImpl.resolveToBaseAndProperty(ValueBindingImpl.java:460)
  |         at org.apache.myfaces.el.ValueBindingImpl.setValue(ValueBindingImpl.java:248)
  |         at org.jboss.seam.core.Expressions$1.setValue(Expressions.java:93)
  |         at org.jboss.seam.core.Pages.applyViewRootValues(Pages.java:665)
  |         at org.jboss.seam.jsf.AbstractSeamPhaseListener.afterRestoreView(AbstractSeamPhaseListener.java:77)
  |         at org.jboss.seam.jsf.SeamPhaseListener.afterPhase(SeamPhaseListener.java:95)
  |         at org.apache.myfaces.lifecycle.PhaseListenerManager.informPhaseListenersAfter(PhaseListenerManager.java:89)
  |         at org.apache.myfaces.lifecycle.LifecycleImpl.restoreView(LifecycleImpl.java:181)
  |         at org.apache.myfaces.lifecycle.LifecycleImpl.execute(LifecycleImpl.java:66)
  |         at javax.faces.webapp.FacesServlet.service(FacesServlet.java:137)
  |         at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:269)
  |         at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:188)
  |         at org.apache.myfaces.webapp.filter.ExtensionsFilter.doFilter(ExtensionsFilter.java:144)
  |         at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:215)
  |         at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:188)
  |         at org.jboss.seam.web.SeamFilter$FilterChainImpl.doFilter(SeamFilter.java:63)
  |         at org.jboss.seam.debug.hot.HotDeployFilter.doFilter(HotDeployFilter.java:60)
  |         at org.jboss.seam.web.SeamFilter$FilterChainImpl.doFilter(SeamFilter.java:49)
  |         at org.jboss.seam.web.RedirectFilter.doFilter(RedirectFilter.java:45)
  |         at org.jboss.seam.web.SeamFilter$FilterChainImpl.doFilter(SeamFilter.java:49)
  |         at org.jboss.seam.web.ExceptionFilter.doFilter(ExceptionFilter.java:57)
  |         at org.jboss.seam.web.SeamFilter$FilterChainImpl.doFilter(SeamFilter.java:49)
  |         at org.jboss.seam.web.SeamFilter$FilterChainImpl.doFilter(SeamFilter.java:53)
  |         at org.jboss.seam.web.MultipartFilter.doFilter(MultipartFilter.java:79)
  |         at org.jboss.seam.web.SeamFilter$FilterChainImpl.doFilter(SeamFilter.java:49)
  |         at org.jboss.seam.web.SeamFilter.doFilter(SeamFilter.java:84)
  |         at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:215)
  |         at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:188)
  |         at org.ajax4jsf.framework.ajax.xmlfilter.BaseXMLFilter.doXmlFilter(BaseXMLFilter.java:96)
  |         at org.ajax4jsf.framework.ajax.xmlfilter.BaseFilter.doFilter(BaseFilter.java:220)
  |         at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:215)
  |         at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:188)
  |         at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:210)
  |         at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:174)
  |         at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:433)
  |         at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:127)
  |         at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:117)
  |         at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:108)
  |         at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:151)
  |         at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:870)
  |         at org.apache.coyote.http11.Http11BaseProtocol$Http11ConnectionHandler.processConnection(Http11BaseProtocol.java:665)
  |         at org.apache.tomcat.util.net.PoolTcpEndpoint.processSocket(PoolTcpEndpoint.java:528)
  |         at org.apache.tomcat.util.net.LeaderFollowerWorkerThread.runIt(LeaderFollowerWorkerThread.java:81)
  |         at org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPool.java:685)
  |         at java.lang.Thread.run(Thread.java:595)
  | 

I don't know, where is the problem.

After saving the category entity I need to clean the category form, but the category (isn't marked with @Out) still appears on the form. I tried to set category = null, but not succesfull.

Know somebody where is the problem ?

Thanks Mila

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