Problem with JBPM nodes and transitions

[chawax]

Hi,

I use JBPM to model a business process and I want to integrate it with Seam. Part of the process is composed of nodes and transitions, with no interaction with users (actually no task nodes). But for a reason I can't find, one transition can't work ...

My JBPM process is a very simple one : 3 nodes linked by single transitions and an end state. My JPDL is as following :

<node name="Node1">
 <transition name="goToNode2" to="Node2">
 <action expression="#{afficherMessageConsole.transition1}" />
 </transition>
 <action expression="#{afficherMessageConsole.goToNode2}" />
</node>
<node name="Node2">
 <transition name="goToNode3" to="Node3">
 <action expression="#{afficherMessageConsole.transition2}" />
 </transition>
 <action expression="#{afficherMessageConsole.goToNode3}" />
</node>
<node name="Node3">
 <transition name="goToEnd" to="End"></transition>
 <action expression="#{afficherMessageConsole.goToEnd}" />
</node>
<end-state name="End"></end-state>

My actions just write on System.out. I added @org.jboss.seam.annotations.Transition annotation to goToxxx methods, and no annotation for other methods (in fact I added @Transition annotation only to methods binded to nodes, not to transitions).

When I run this process, the transition between Node1 and Node2 is ok, but transition between Node2 and Node3 doesn't work. The transition2 method is never called ! Note there is nothing in the logs.

Did I did something wrong ?

Thanks in advance for your help.

[pmuir]

The JavaDoc for @Transition states

Allows the application to set the jBPM transition to be used when an <tt>@EndTask</tt> method is encountered.

So, nothing to do with transitions between nodes when tasks aren't involved.

[chawax]

Well it's strange because transition from Node1 to Node2 works well with @Transition ... Anyway, how can I do to fire a transition from an action (method of a Seam component) ?

[chawax]

To be more precise ...

When I used JBPM without seam, I had to write these lines in my action handlers so that the process continues :

public void execute(ExecutionContext context) throws Exception {
 context.leaveNode();
}

What should I do with Seam to make it work the same ?

[chawax]

I found a solution on another post on this forum. I inject processInstance then I can call processInstance.getRootToken().signal() and it works.

Something like that :

public class AfficherMessageConsole {

 @In
 private org.jbpm.graph.exe.ProcessInstance processInstance;

 public void goToNode2() throws Exception {
 execute("GO TO NODE 2");
 processInstance.getRootToken().signal();
 }
}

Is it the good way to do it or there is a nicer solution ?

[chawax]

I have another problem with transitions. I have a task-node with 2 transitions "Accepter" and "Refuser". These transitions can be fired from two command buttons in a JSF. These transitions go to nodes with Seam actions binded to them. But when JBPM calls these actions, the processInstance I get with the @In annotation is null ... Why is this processInstance null ?

Here is my JSF :

<h:dataTable value="#{taskInstanceList}" var="task" rendered="#{not empty taskInstanceList}">
 <h:column>
 <f:facet name="header">
 <h:outputText value="Description"/>
 </f:facet>
 <h:outputText value="#{task.description}"/>
 </h:column>
 <h:column>
 <f:facet name="header">
 <h:outputText value="Effectuée le"/>
 </f:facet>
 <h:outputText value="#{task.taskMgmtInstance.processInstance.start}">
 <f:convertDateTime type="date"/>
 </h:outputText>
 </h:column>
 <h:column>
 <s:button value="Accepter" action="#{afficherMessageConsole.accepterDemande}" taskInstance="#{task}" />
 <s:button value="Refuser" action="#{afficherMessageConsole.refuserDemande}" taskInstance="#{task}" />
 </h:column>
</h:dataTable>

Here is my Java class :

public class AfficherMessageConsole {

 @In
 private ProcessInstance processInstance;

 @StartTask
 @EndTask (transition="Accepter")
 public String accepterDemande() throws Exception {
 return "validationDemandes";
 }

 @StartTask
 @EndTask (transition="Refuser")
 public String refuserDemande() throws Exception {
 return "validationDemandes";
 }

 public void demandeAcceptee() throws Exception {
 log("Demande acceptee !");
 processInstance.getRootToken().signal();
 }

 public void demandeRefusee() throws Exception {
 log("Demande refusee !");
 processInstance.getRootToken().signal();
 }
}

And finally a part of the JPDL :

<task-node name="Avis de la RH">
 <task name="Validation de la RH">
 <assignment actor-id="#{actor.id}" />
 </task>
 <transition name="Refuser" to="Refus"></transition>
 <transition name="Accepter" to="Acceptation"></transition>
</task-node>
<node name="Refus">
 <action expression="#{afficherMessageConsole.demandeRefusee}" />
 <transition name="" to="End"></transition>
</node>
<node name="Acceptation">
 <transition to="End" />
 <action expression="#{afficherMessageConsole.demandeAcceptee}" />
</node>
<end-state name="End"></end-state>

I looked for samples in the source code, but there are no examples with nodes (and it's a shame). I'm not sure I understood well how to integrate Seam and JBPM, so feel free to tell me if I do something wrong !

Thanks in advance ;)

[chawax]

Anyone could help me ? I really can't understand what happens :(
I work with Seam 1.1.6, JBPM 3.1.4 and JBoss 4.0.5 GA