Provide AssignmentHandler like functionality with BPMN

I posted a question on the community about how to mimic AssignmentHandler functionality when using BPMN and received a response from HuiSheng Xu asking that I enter a feature request. http://community.jboss.org/message/554236#554236

Specifically:

I am successfully using jPDL with an AssignmentHandler to programatically assign a task.

<task name="review" >
<assignment-handler class="mypackage.AssignBySomeRule">
<field name="ruleName">
<string value="exampleAssignmentRuleName" />
</field>
</assignment-handler>
<transition to="approval" />
</task>

Is it possible to accomplish this with BPMN? I know there is a "resourceAssignmentExpression", but it isn't clear that this can do the same thing.

<userTask id="myTask" name="My task">
<potentialOwner resourceRef="manager" jbpm:type="group">
<resourceAssignmentExpression>
<formalExpression>management</formalExpression>
</resourceAssignmentExpression>
</potentialOwner>
</userTask>

Can the "formalExpression" invoke arbitrary java classes or does it need to use process variables to evaluate to a user or group name?

Thanks!

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reply from HuiSheng Xu in jBPM
Hi Jamine,

There is no support for AssignmentHandler in BPMN. Please open an issue for this feature.