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Date: Sat, 16 Jun 2012 21:18:53 -0400
Message-ID: 
 <CAN39H2Q-HEa67v=AXrKKV80PDOJMexE+=-sEC523yvo4oaZ52A@mail.gmail.com>
Subject: Re: [scxml] JEXL Evaluator's evalCond issue
From: Rahul Akolkar <rahul.akolkar@gmail.com>
To: Commons Users List <user@commons.apache.org>
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On Thu, Jun 14, 2012 at 5:23 PM,  <SGutta@osc.state.ny.us> wrote:
> 1. Problem renaming method in class used for condition evaluation.
>
> Class: Test
> method: boolean method1(integer i)
>
> xml snippet:
>
> <state id=3D"DELETE_STATE">
> =A0 =A0 =A0 =A0 =A0 =A0<transition event=3D"delete" target=3D"STATUS_UNKN=
OWN"
> cond=3D"test.method1(100)"/>
> </state>
>
>
> We are trying rename test.method1(integer i) in Test class to
> test.methodRenamed(integer i)
>
> and update xml to:
>
> <state id=3D"DELETE_STATE">
> =A0 =A0 =A0 =A0 =A0 =A0<transition event=3D"delete" target=3D"STATUS_UNKN=
OWN"
> cond=3D"test.methodRenamed(100)"/>
> </state>
>
> Executing SCXML after the above change, test.methodRenamed(100) is not
> invoked and no information in logs are seen nor any exception seen in the
> trace.
>
> Note: Putting back to the old method name (test.method1(100)) works as
> expected.
>
<snip/>

It isn't clear how you are testing the changes once you update the
Test class. From the description, it doesn't look like the new Test
class is loaded. I don't think this is related to Commons SCXML (i.e.
the library code).


>
> 2. Problem adding a new method (test.methodNew(200)).
>
> Class: Test
> methods: boolean method1(Integer i)
> =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0boolean methodNew(Integer i)
>
> <transition event=3D"delete" target=3D"STATUS_UNKNOWN" cond=3D"test.metho=
d1(100)
> &amp;&amp; test.methodNew(200)"/>
>
>
> Executing SCXML:
>
> 1. test.method1(100) was invoked and returned true.
>
> 2. test.methodNew(200) was never invoked
>
> 3. JexlEvaluator's method "evalCond" line
> exp.evaluate(getEffectiveContext(jexlCtx)) returns false.
>
> Note: Adding a non existent method or junk string to the xml's cond
> attribute doesn't yield any failure information and JexlEvaluator simply
> returns false .
>
<snap/>

Same comment as above. Additionally, boolean expressions are assumed
to be false unless they successfully evaluate to true.


> Versions used: commons-scxml-0.9.jar, commons-jexl.1.1.jar
>
> The issue seems to be a JEXL issue, however upgrading to the latest JEXL =
2
> version is not feasible due to compilation issues.
>
> Is there/will there be a version of SCXML that is compatible with a later
> version of JEXCL? (ie: JEXL2)
>
<snip/>

You can try the Evaluator implementation attached here [1] (which is
not released code) or provide your own evaluator implementation [2]
for this.

-Rahul

[1] https://issues.apache.org/jira/browse/SCXML-114
[2] http://commons.apache.org/scxml/guide/contexts-evaluators.html


>
> Thanks & Regards
> Satish Gutta
>
>
>
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