process variable vs. condition expression

[larsson7]

Hello all,

ich have a question about sequence flows and process variables. I have a process with a script task just after the start event. In the script task i define the process variable outputTransition that can get the value "approved" or "denied". After the script task, an exclusive gateway splits the process. And now i want to discribe the two sequence flows out of the gateway. If the process variable is "approved" it the process should go right if it is "denied" left.

But i get the following error:

Packages.com.liferay.portal.kernel.workflow.WorkflowStatusManagerUtil.updateStatus(Packages.com.liferay.portal.kernel.workflow.WorkflowConstants.toStatus(outputTransition), workflowContext);
06:58:38,253 ERROR [http-bio-8080-exec-3][render_portlet_jsp:154] org.activiti.engine.ActivitiException: Unknown property used in expression
   at org.activiti.engine.impl.el.JuelExpression.getValue(JuelExpression.java:55)
   at org.activiti.engine.impl.el.UelExpressionCondition.evaluate(UelExpressionCondition.java:37)
   at org.activiti.engine.impl.bpmn.behavior.ExclusiveGatewayActivityBehavior.leave(ExclusiveGatewayActivityBehavior.java:63)
   at org.activiti.engine.impl.bpmn.behavior.FlowNodeActivityBehavior.execute(FlowNodeActivityBehavior.java:36)
   at org.activiti.engine.impl.pvm.runtime.AtomicOperationActivityExecute.execute(AtomicOperationActivityExecute.java:44)
   at org.activiti.engine.impl.interceptor.CommandContext.performOperation(CommandContext.java:80)
   at org.activiti.engine.impl.persistence.entity.ExecutionEntity.performOperationSync(ExecutionEntity.java:546)
   at org.activiti.engine.impl.persistence.entity.ExecutionEntity.performOperation(ExecutionEntity.java:541)
   at org.activiti.engine.impl.pvm.runtime.AtomicOperationTransitionNotifyListenerStart.eventNotificationsCompleted(AtomicOperationTransitionNotifyListenerStart.java:52)
   at org.activiti.engine.impl.pvm.runtime.AbstractEventAtomicOperation.execute(AbstractEventAtomicOperation.java:56)
   at org.activiti.engine.impl.interceptor.CommandContext.performOperation(CommandContext.java:80)
   at org.activiti.engine.impl.persistence.entity.ExecutionEntity.performOperationSync(ExecutionEntity.java:546)
   at org.activiti.engine.impl.persistence.entity.ExecutionEntity.performOperation(ExecutionEntity.java:541)
   at org.activiti.engine.impl.pvm.runtime.AbstractEventAtomicOperation.execute(AbstractEventAtomicOperation.java:49)
   at org.activiti.engine.impl.interceptor.CommandContext.performOperation(CommandContext.java:80)
   at org.activiti.engine.impl.persistence.entity.ExecutionEntity.performOperationSync(ExecutionEntity.java:546)
   at org.activiti.engine.impl.persistence.entity.ExecutionEntity.performOperation(ExecutionEntity.java:541)
   at org.activiti.engine.impl.pvm.runtime.AtomicOperationTransitionCreateScope.execute(AtomicOperationTransitionCreateScope.java:49)
   at org.activiti.engine.impl.interceptor.CommandContext.performOperation(CommandContext.java:80)
   at org.activiti.engine.impl.persistence.entity.ExecutionEntity.performOperationSync(ExecutionEntity.java:546)
Caused by: org.activiti.engine.impl.javax.el.PropertyNotFoundException: Cannot resolve identifier 'outputTransition'
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Can i use process variables in a flow expression and how? Can i declare a property in a script task so i can use it in a flow expression?

Can someone please help?!

Thanks all 🙂

Best regards, Philipp

[frederikherema1]

How do you set the variable in your script task? You can always use the "execution" object to set variables, or the "activiti:resultVariable" on the script-task:


<script>
    def scriptVar = "test123"
    execution.setVariable("myVar", scriptVar)
</script>


[larsson7]

My script task looks like that:


user = Packages.com.liferay.portal.service.UserLocalServiceUtil.fetchUser(10402);
roles = user.getRoleIds();
outputTransition = "denied";
for (i = 0; i < roles.length; i++) {
if (roles[i] == 15) {
  outputTransition = "approved";
break;
}
}
Packages.com.liferay.portal.kernel.workflow.WorkflowStatusManagerUtil.updateStatus(Packages.com.liferay.portal.kernel.workflow.WorkflowConstants.toStatus(outputTransition), workflowContext);

It works when i just check the variable outputTransition but when i want to use the variable later in the workflow it doesn´t..

Best regards, Philipp

[frederikherema1]

Use this after the for-loop:

execution.setVariable("outputTransition", outputTransition)

[larsson7]

Thanks frederikheremans,

but it doesn´t help..
Do i have to import another class or something to get it work?
I just create a script task and wrote the code above into main Config of the Script Task.
So when i try like you said, i get the following error:


Caused by: com.liferay.portal.kernel.scripting.ScriptingException: ReferenceError: "execution" is not defined.

I use eclipse and Liferay 6.1.

Thanks!

[frederikherema1]

What environment are you running in? Activiti inside life ray?

[larsson7]

I use the activiti pluin for liferay. Both with the newest versions.
So Activiti is integrated in liferay.
And i want to use activiti to model different workflows for example to create web content or something.

In my workflows i want add some code in javascript like above. To make it work in Liferay i have to change the scriptformat from javascript to LiferayJavaScript.

But there is one problem that i don´t see yet. For example the execution.setVariable().

So when i use the exmaple above in Liferay with scriptformat "javascript" i get the following error:

[http-bio-8080-exec-3][render_portlet_jsp:154] org.activiti.engine.ActivitiException: problem evaluating script: sun.org.mozilla.javascript.internal.EcmaError: ReferenceError: "workflowContext" is not defined. (<Unknown source>#17) in <Unknown source> at line number 17

And when i use it with scriptformat "LiferayJavaScript" i get this:

com.liferay.portal.kernel.scripting.ScriptingException: ReferenceError: "execution" is not defined. (script#10)

Greetings and thanks!

[frederikherema1]

I'm not aware how the Liferay-plugin is hooked in. All I know is that activiti exposes the "execution" to all scripts in script-task, using the default JSR-223 ScriptBindings. It's up to the JS-engine to use this and seems like liferayJavascript doesn't expose this. Is the WorkflowContext also LiferaySpecific? Maybe it exposes a way to set variables on an execution?

[larsson7]

Yes WorkflowContext is also Liferay specific.
So when i understand you right, execution.setVariable is not supported in Liferay?! Is there any chance to get more information about activiti / Liferay integration?! It is very difficult to get the right information about this topic.

Best Regards, Philipp

[frederikherema1]

There are a couple of wiki-pages on http://www.emforge.net/web/activiti-liferay/wiki/-/wiki/Main/BPMN+2.0+for+Liferay+with+using+Activit.... I suggest checking out the sources for this to see how the nuts and bolts fit together…

The project not maintained by the Activiti core-team. Perhaps try to contact the project owner?