[jboss-user] [JBoss jBPM] - Variable resolver

[chawax]

Hi,

I am a newbie to jBPM and I need help about variable resolvers.

I wrote an Action handler with an "idDemande" parameter. This parameter should be an EL expression, so that I my action handler could be context independant. For what I understood, I should use a variable resolver, but I can't understand how it works (and I found no documentation about it).

My node is configured as following :

<node name="Valider la demande">
  |       <transition name="" to="Fin"></transition>
  |       <action class="fr.horoquartz.t4.workflow.actions.absences.ValiderDemandeAbsenceAction">
  |          <idDemande>#{processInstance.id_element}</idDemande>
  |       </action>
  | </node>

I'm not sure the EL expression is right ...

I wrote this evaluate function in my action handler :

private String evaluate(String expression, ExecutionContext executionContext) {
  | 		VariableResolver variableResolver = JbpmExpressionEvaluator.getUsedVariableResolver();
  | 		if (variableResolver != null) {
  | 			variableResolver = new JbpmVariableResolver();
  | 		}
  | 		return (String) JbpmExpressionEvaluator.evaluate(expression, executionContext, variableResolver);
  | 	}

But I have a NullPointerException when I run it.

Note I can read the process instance variable this way :

Long idElement = (Long) executionContext.getContextInstance().getVariable("id_element");

But it makes my action handler context dependant.

Thanks for your help ;)

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