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From "Ingmar Kliche (JIRA)" <j...@apache.org>
Subject [jira] Created: (SCXML-52) Error on resolving conflicting transitions for compound states
Date Fri, 27 Jul 2007 21:25:53 GMT
Error on resolving conflicting transitions for compound states
--------------------------------------------------------------

                 Key: SCXML-52
                 URL: https://issues.apache.org/jira/browse/SCXML-52
             Project: Commons SCXML
          Issue Type: Bug
    Affects Versions: 0.6
            Reporter: Ingmar Kliche


There seems to be a problem on the resolution of conflicting transitions for compound states.
See the following scxml document:

<scxml xmlns="http://www.w3.org/2005/07/scxml" version="1.0" initialstate="s1">
    <datamodel>
        <data name="x"/>
    </datamodel>
    
    <state id="s1">
        <initial>
            <transition target="s11"/>
        </initial>
        
        <transition event="event_1">
            <assign name="x"  expr="'s1'"/>
        </transition>
       
       <transition event="event_2" target="s1">
            <assign name="x"  expr="'s1'"/>
        </transition>
        
        <state id="s11">
            <transition event="event_1">
                       <assign name="x"  expr="'s11'"/>
            </transition>
           <transition event="event_2" target="s11">
                       <assign name="x"  expr="'s11'"/>
            </transition>
        </state>
    </state>
    
    <state id="s2" final="true" />
</scxml>

The state machine enters a compound state s1 which contains another state s11 as its intitial
state. Both states have transitions on event_1 and event_2. Note that event_1 has no target,
whereas event_2 has a target towards the same state.

For event_2 everything works as expected, i.e. only the transition on state s11 is executed
and therefor s11 is reentered (I have a listener in my environment and can monitor this).


The error occurs at event_1. On event_1 both transitions of s1 _and_ s11 are executed - but
only once. After this, the state machine gets stuck (in particular the currentStates-List
is empty). Any subsequent event will not cause any further action.

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