topic Re: ServiceTask delegateexprssion is not honoring field settings in Alfresco Archive

ServiceTask delegateexprssion is not honoring field settings

kesavkolla — Fri, 13 May 2011 05:15:14 GMT

If the service task is defined with delegateexpression it's not honoring fields that are defined in BPMN. The delegate gets instantiated but the fields are not set.The code in BpmnParse.java line 902 when creating ServiceTaskDelegateExpressionActivityBehavior the fields are not parsed. Also the co

Re: ServiceTask delegateexprssion is not honoring field settings

trademak — Fri, 13 May 2011 06:57:56 GMT

Hi,

In the user guide it says "Field injection is supported when using the 'class' attribute".
So it's not a bug, but more a feature request.
Could you explain your use case a bit more? What would you like to inject?

Best regards,

Re: ServiceTask delegateexprssion is not honoring field settings

sangv — Tue, 01 Nov 2011 19:34:05 GMT

I am facing the same scenrio when working with 5.7 Activiti. I have this in my process

<serviceTask id="servicetask1" name="My Task Execution Service" activiti:delegateExpression="${testExpressionDelegate}">
      <extensionElements>
        <activiti:field name="field1">
          <activiti:string>name</activiti:string>
        </activiti:field>
      </extensionElements>
    </serviceTask>

Where testExpressionDelegate is a Spring bean (which I am using as my delegate expression.) for a class that implements JavaDelegate

public class MyTaskDelegate implements JavaDelegate {

 @Autowired
 private Service service;

 private Expression field1;

 /**
  * @see org.activiti.engine.delegate.JavaDelegate#execute(org.activiti.engine.delegate.DelegateExecution)
  */
 @Override
 public void execute(DelegateExecution delegateExecution) throws Exception {
…
  if (field1 != null) {
   String field1AsString = (String) field1.getValue(delegateExecution);
   …
  }

 }

But the field1 is always null. Like you said, the field1 gets a value if I use this directly as a java class but I want to wire some things into this class and cannot use it like that.

Please let me know if you want more details or if this feature has already been added.

Thanks,
Sang

Re: ServiceTask delegateexprssion is not honoring field settings

ronald_van_kuij — Wed, 02 Nov 2011 09:08:20 GMT

this is not supported… with expressions you can pass in parameters IN the expression, so that is the 'workaround'

Re: ServiceTask delegateexprssion is not honoring field settings

sangv — Wed, 02 Nov 2011 22:22:37 GMT

Well I understand that it can be done with expressions but I was using delegateExpression implementing the JavaDelegate interface so that I could get access to context (and all the process variables etc and not have to pass everything in as a parameter). Well, as a workaround I added an execution listener to the task and used that to interpret the field expressions.

<activiti:executionListener event="start" class="MyTaskListener">

public class MyTaskListener implements ExecutionListener {

 private Expression field1;

@Override 
public void notify(DelegateExecution paramDelegateExecution) throws Exception {

  if (field1 != null) {
   paramDelegateExecution.setVariableLocal("field1", field1.getExpressionText());
  }

}

Then I can get the field on my Service task delegate class (wired thro spring)
Object field1 = delegateExecution.getVariableLocal("field1");
Let me know if you have any comments on this.

Thanks,
Sang

Re: ServiceTask delegateexprssion is not honoring field settings

ronald_van_kuij — Mon, 12 Mar 2012 16:07:24 GMT

Anyone still interested in having this 'fixed'? (I volunteer)

Re: ServiceTask delegateexprssion is not honoring field settings

adrobisch — Mon, 23 Apr 2012 09:31:03 GMT

Yes, please add this. It's also important for Activiti OSGI (which only supports delegateExpression).

Re: ServiceTask delegateexprssion is not honoring field settings

bernd_ruecker — Wed, 19 Sep 2012 10:26:08 GMT

Okay, done as part of the Activiti Hack Days (see http://www.bpm-guide.de/2012/08/16/activiti-hack-days/) 🙂
See http://jira.codehaus.org/browse/ACT-1379 and http://jira.codehaus.org/browse/ACT-847

Re: ServiceTask delegateexprssion is not honoring field settings

marcelwolf — Thu, 24 Nov 2016 08:20:37 GMT

Is there something new about this?

I try to use it OSGI context and if i try to pass Expressions into my cached bean i got an error :

<blockcode>
Process task 302639 was signaled to leave.
2016-11-24 08:35:07,083 | WARN | m://client_queue | BpmnProducer | 45 - logger-logging - 1.0.0 | Error while Calling BPMN: org.activiti.engine.ActivitiIllegalArgumentException: Field definition uses unexisting field 'moduleName' on class Proxy8477823f_cf1d_4efb_8912_0b18301965d9
ActivitiIllegalArgumentException: Field definition uses unexisting field 'moduleName' on class Proxy8477823f_cf1d_4efb_8912_0b18301965d9

</blockcode>

i Use Version 5.19.3