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From "Jon Brule" <tricolor...@gmail.com>
Subject Re: [SCXML] Datamodel / Assign expression error
Date Sun, 02 Jul 2006 01:22:01 GMT
>> 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:
>>
><snip/>
>>
>>    <onentry>
>>      <assign location="Data(userprof,'UserProfile/UserID')" expr="N"/>
>>    </onentry>
>>
><snap/>
>
>The location attribute is an expression, and hence, when using JSP 2.0
>EL should be wrapped in ${...}
>
>See this test case for various <assign> usages when the SCXML document
>uses EL (long URL, may get fragmented):
>
>http://svn.apache.org/repos/asf/jakarta/commons/proper/scxml/trunk/src/test/java/org/apache/commons/scxml/env/jsp/datamodel-01.xml
>
>-Rahul

Rahul,

Thanks for the quick answer. I tried to wrap the expression as shown below:

    <onentry>
      <assign location="${Data(userprof,'UserProfile/UserID')}" expr="N"/>
    </onentry>

But I got the following error messages:
2006-07-01 21:02:44,625 [main] WARN  org.apache.commons.scxml.Builtin
- Data(): No nodes matching the XPath expression "UserProfile/UserID",
returning null
2006-07-01 21:02:44,625 [main] ERROR scxml.app.log  - <assign>:
location does not point to a <data> node


The datamodel I am trying to access is as follows:
  <datamodel>
    <data name="userprof">
      <UserProfile>
        <UserID/>
        <Person>
          <FirstName/>
          <MiddleName/>
          <LastName/>
        </Person>
      </UserProfile>
    </data>
  </datamodel>

Is there a problem with the <UserID/> tag being an empty tag? Is there
a problem with my accessing the datamodel from within an <onentry/>
tag?

Thoughts?

--
Jon Brule
tricolorcat-at-gmail.com

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