Trying to implement a loop in JPDL

[waltertaus]

Hello,

I have tried to implement a loop in JPDL. My source looks as follows

<?xml version="1.0" encoding="UTF-8"?>
<process-definition xmlns="" name="Pool">
<start-state name="StartState1212041906165">
<transition to="LoopBefore3/LoopBefore3LoopCounterInit"></transition>
</start-state>
<super-state name="LoopBefore3">
<node name="LoopBefore3LoopCounterInit">
<event type="node-enter">
<script><expression>
System.out.println(executionContext.getNode().getName() + " entered");
executionContext.setVariable("_f5Ue8CyoEd2cO4xcRmnV4wLoopCounter", 0);
executionContext.leaveNode();
</expression></script></event>
<transition name="To_f5Ue8CyoEd2cO4xcRmnV4w" to="LoopBefore3LoopDecision"></transition>
</node>
<decision name="LoopBefore3LoopDecision">
<event type="node-enter">
<script><expression>
System.out.println(executionContext.getNode().getName() + " entered");
</expression></script></event>
<transition name="To_f5Ue8CyoEd2cO4xcRmnV4w" to="LoopBefore3"></transition>
<transition name="To_mTMyICyoEd2cO4xcRmnV4w" to="../End/End">
<condition expression="#{contextInstance.variables['_f5Ue8CyoEd2cO4xcRmnV4wLoopCounter']>= '3'}"></condition>
</transition>
</decision>
<task-node name="LoopBefore3">
<event type="node-enter">
<script><expression>
System.out.println(executionContext.getNode().getName() + " entered");
executionContext.leaveNode();
</expression></script></event>
<event type="node-leave">
<script><expression>
executionContext.setVariable("_f5Ue8CyoEd2cO4xcRmnV4wLoopCounter", executionContext.getVariable("_f5Ue8CyoEd2cO4xcRmnV4wLoopCounter") + 1);
</expression></script></event>
<transition name="To_f5Ue8CyoEd2cO4xcRmnV4w" to="LoopBefore3LoopDecision"></transition>
<task name="LoopBefore3"></task>
</task-node>
</super-state>
<super-state name="End">
<end-state name="End">
<event type="node-enter">
<script><expression>
System.out.println(executionContext.getNode().getName() + " entered");
</expression></script></event>
</end-state>
</super-state>
</process-definition>

I receive the following at the Console:

StartState1212041906165
LoopBefore3LoopCounterInit entered
LoopBefore3LoopDecision entered
LoopBefore3 entered
LoopBefore3LoopDecision entered
LoopBefore3 entered
LoopBefore3LoopDecision entered
LoopBefore3 entered
LoopBefore3LoopDecision entered
End entered
LoopBefore3LoopDecision entered
End entered

I am totally puzzled with this result, as I am hitting twice the end-state. The first time entering the end state does not seem to have any effect. Can anyone explain what I am doing wrong here.

Thanks,
Walter

[kukeltje]

you have no real end state, only a basic process and 2 superstates. Could be that there is a 'bug' in jBPM that tries to find an end-state and see's it in the superstate. That is executed once because it is a superstate node and maybe once more because it is seen as *the* end state. See what happens if you have a real end-state or remove the superstate around the end-state

btw, why this construction with the superstate around the end-state

[waltertaus]

I have removed the super-state around the end-state (and there is no real need for it), but the result is still the same.
What do you mean with "real end state"?

Thanks,
Walter

[kukeltje]

real end state was 'not an end-state in a super state'. I have no hands-on experience with superstates, so unfortunately not able to help you further

[waltertaus]

ven after removal of the super-state around the end-state the behaviour is still the same. So I do not really understand where this invocation of the after having reached the end state comes from.
Any help on this will be highly appreciated.

Thanks,
Walter