[jboss-user] [JBoss jBPM] - Re: About decision node, I need help

[ppxiaofei]

I add these info from console

17:40:56,390 ERROR [[FacesServlet]] Servlet.service() for servlet FacesServlet t
  | hrew exception
  | javax.faces.FacesException: Error calling action method of component with id _id1_0:_id4
  |         at org.apache.myfaces.application.ActionListenerImpl.processAction(ActionListenerImpl.java:74)
  |         at javax.faces.component.UICommand.broadcast(UICommand.java:106)
  |         at javax.faces.component.UIData.broadcast(UIData.java:338)
  |         at javax.faces.component.UIViewRoot._broadcastForPhase(UIViewRoot.java:90)
  |         at javax.faces.component.UIViewRoot.processApplication(UIViewRoot.java:164)
  |         at org.apache.myfaces.lifecycle.LifecycleImpl.invokeApplication(LifecycleImpl.java:271)
  |         at org.apache.myfaces.lifecycle.LifecycleImpl.execute(LifecycleImpl.java:86)
  |         at javax.faces.webapp.FacesServlet.service(FacesServlet.java:94)
  |         at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:252)
  |         at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:173)
  |         at org.jbpm.webapp.filter.AuthenticationFilter.doFilter(AuthenticationFilter.java:55)
  |         at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:202)
  |         at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:173)
  |         at org.jbpm.web.JbpmContextFilter.doFilter(JbpmContextFilter.java:83)
  |         at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:202)
  |         at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:173)
  |         at org.jbpm.webapp.filter.LogFilter.doFilter(LogFilter.java:59)
  |         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:81)
  |         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.CustomPrincipalValve.invoke(CustomPrincipalValve.java:39)
  |         at org.jboss.web.tomcat.security.SecurityAssociationValve.invoke(SecurityAssociationValve.java:159)
  |         at org.jboss.web.tomcat.security.JaccContextValve.invoke(JaccContextValve.java:59)
  |         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:856)
  |         at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.processConnection(Http11Protocol.java:744)
  |         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)
  | Caused by: javax.faces.el.EvaluationException: Exception while invoking expression #{homeBean.selectTaskInstance}
  |         at org.apache.myfaces.el.MethodBindingImpl.invoke(MethodBindingImpl.java:153)
  |         at org.apache.myfaces.application.ActionListenerImpl.processAction(ActionListenerImpl.java:63)
  |         ... 35 more
  | Caused by: java.lang.NullPointerException: value
  |         at javax.faces.model.SelectItem.setValue(SelectItem.java:116)
  |         at org.jbpm.webapp.bean.TaskBean.initialize(TaskBean.java:130)
  |         at org.jbpm.webapp.bean.HomeBean.selectTaskInstance(HomeBean.java:63)
  |         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:585)
  |         at org.apache.myfaces.el.MethodBindingImpl.invoke(MethodBindingImpl.java:129)
  |         ... 36 more
  | 17:41:00,000 DEBUG [JbpmContextInfo] creating jbpm context with service factorie
  | s '[message, scheduler, logging, persistence, authentication]'

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