[SCXML] Datamodel / Assign expression error

[Jon Brule]

Good evening,

I am using an SCXML state machine to model the life of a user profile
bean. To this end, I am attempting to use a root-level data model to
indicate which properties are mutable and when during the life cycle
of the user profile. The preliminary SCXML is as follows:

<?xml version="1.0"?>
<scxml xmlns="http://www.w3.org/2005/07/SCXML";
      version="1.0"
      initialstate="Created">

 <datamodel>
   <data name="userprof">
     <UserProfile>
       <UserID/>
       <Person>
         <FirstName/>
         <MiddleName/>
         <LastName/>
       </Person>
     </UserProfile>
   </data>
 </datamodel>

 <state id="Created">
   <transition event="profile_created" target="Request"/>
   <transition event="credentials_validated" target="Authenticated"/>
 </state>
 <state id="Request">
   <transition event="profile_requested" target="Verification"/>
 </state>
 <state id="Verification">
   <transition event="profile_verified" target="Finalization"/>
 </state>
 <state id="Finalization">
   <transition event="profile_finalized" target="Authenticated"/>
 </state>
 <state id="Authenticated">
   <onentry>
     <assign location="Data(userprof,'UserProfile/UserID')" expr="N"/>
   </onentry>
   <transition event="done">
     <exit/>
   </transition>
 </state>

</scxml>

When I run a JUnit test case which fires signal events against the
model, I get the following error when entering the Authenticated
state:

2006-06-29 21:20:54,218 [main] WARN
org.apache.commons.scxml.env.SimpleErrorReporter  - EXPRESSION_ERROR
(javax.servlet.jsp.el.ELException: Attempt to convert String
"LData(userprof,'UserProfile/UserID')" to type "org.w3c.dom.Node", but
there is no PropertyEditor for that type):

I have included the Jakarta Commons EL and J2EE v1.4 libraries in my
classpath, but it seems that I am missing a PropertyEditor.

Can anyone shed some light on where I might find this property editor?
Or if I am incorrectly handling the assignment ?

Thanks for you help!

--
Jon Brule
tricolorcat-at-gmail.com

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