4 Replies Latest reply on Oct 16, 2006 4:58 AM by fatbeat

About decision node, I need help

ppxiaofei Oct 12, 2006 3:46 AM

Hi, I meet a problem, anyone could help me?
I want to add a DecisionNode in my process definition, this is the first sample:

<start-state name="start">
 <task name="NewApply" swimlane="proposer"></task>
 <transition name="" to="DepLeader"></transition>
 </start-state>
 <task-node name="DepLeaderApprove">
 <task name="DepLeaderUpdte" swimlane="depleader"></task>
 <transition name="" to="NeedUnitLeader"></transition>
 </task-node>
 <decision name="NeedUnitLeader">
 <handler class="com.test.action.NeedUnitleaderApproveHandler">
 </handler>
 <transition name="ToUnitLeader" to="UnitLeaderApprove"></transition>
 <transition name="ToUser" to="UserConfirm"></transition>
 </decision>
 <task-node name="UnitLeaderApprove">
 <task name="UnitLeaderUpdte" swimlane="unitleader"></task>
 <transition name="" to="UserConfirm"></transition>
 </task-node>
 ...

It is OK.
But I want to add a task node after the DepLeaderApprove node to realize the return to sender function.
This is the second sample:

<start-state name="start">
 <task name="NewApply" swimlane="proposer"></task>
 <transition name="" to="DepLeader"></transition>
 </start-state>
 <task-node name="DepLeaderApprove">
 <task name="DepLeaderUpdte" swimlane="depleader"></task>
 <transition name="" to="NeedUnitLeader"></transition>
 </task-node>
 <task-node name="Modify">
 <task name="ModifyApply" swimlane="proposer"></task>
 <transition name="" to="DepLeaderApprove"></transition>
 </task-node>
 <decision name="NeedUnitLeader">
 <handler class="com.test.action.NeedUnitleaderApproveHandler">
 </handler>
 <transition name="ToUnitLeader" to="UnitLeaderApprove"></transition>
 <transition name="ToUser" to="UserConfirm"></transition>
 </decision>
 <task-node name="UnitLeaderApprove">
 <task name="UnitLeaderUpdte" swimlane="unitleader"></task>
 <transition name="" to="UserConfirm"></transition>
 </task-node>
 ...

After I deploy this, when the DepLeader open the instance from home page on Node'DepLeaderApprove', an exception throw like this:

type Exception report

message

description The server encountered an internal error () that prevented it from fulfilling this request.

exception

javax.servlet.ServletException: Error calling action method of component with id _id1_5:_id4
 javax.faces.webapp.FacesServlet.service(FacesServlet.java:109)
 org.jbpm.webapp.filter.AuthenticationFilter.doFilter(AuthenticationFilter.java:55)
 org.jbpm.web.JbpmContextFilter.doFilter(JbpmContextFilter.java:83)
 org.jbpm.webapp.filter.LogFilter.doFilter(LogFilter.java:59)
 org.jboss.web.tomcat.filters.ReplyHeaderFilter.doFilter(ReplyHeaderFilter.java:81)


root cause

javax.faces.FacesException: Error calling action method of component with id _id1_5:_id4
 org.apache.myfaces.application.ActionListenerImpl.processAction(ActionListenerImpl.java:74)
 javax.faces.component.UICommand.broadcast(UICommand.java:106)
 javax.faces.component.UIData.broadcast(UIData.java:338)
 javax.faces.component.UIViewRoot._broadcastForPhase(UIViewRoot.java:90)
 javax.faces.component.UIViewRoot.processApplication(UIViewRoot.java:164)
 org.apache.myfaces.lifecycle.LifecycleImpl.invokeApplication(LifecycleImpl.java:271)
 org.apache.myfaces.lifecycle.LifecycleImpl.execute(LifecycleImpl.java:86)
 javax.faces.webapp.FacesServlet.service(FacesServlet.java:94)
 org.jbpm.webapp.filter.AuthenticationFilter.doFilter(AuthenticationFilter.java:55)
 org.jbpm.web.JbpmContextFilter.doFilter(JbpmContextFilter.java:83)
 org.jbpm.webapp.filter.LogFilter.doFilter(LogFilter.java:59)
 org.jboss.web.tomcat.filters.ReplyHeaderFilter.doFilter(ReplyHeaderFilter.java:81)

Anyone could tell me the reason? thanks

1. Re: About decision node, I need help

kukeltje Oct 12, 2006 5:20 AM (in response to ppxiaofei)

Post the stacktrace from the logging, not the ones on the screen......
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2. Re: About decision node, I need help

ppxiaofei Oct 12, 2006 5:45 AM (in response to 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]'

3. Re: About decision node, I need help

ppxiaofei Oct 13, 2006 3:26 AM (in response to ppxiaofei)

Hi, my buddies
I think I got the solution.
When add more than two transitions from one node (tack node or decision) , each transition must have name.
If one transition's name is null, this exception will be thrown.
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4. Re: About decision node, I need help

fatbeat Oct 16, 2006 4:58 AM (in response to ppxiaofei)

i think you can leave out the name if you don't call it explicitly, but then you have to leave the name out as a whole, that means you must not write name="" just lave the name property out.
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