topic ActivitiIllegalArgumentException: org.activiti.BasicAdditionDelegate doesn't implement org.activiti.engine.delegate.JavaDelegate in Alfresco Forum

ActivitiIllegalArgumentException: org.activiti.BasicAdditionDelegate doesn't implement org.activiti.engine.delegate.JavaDelegate

harshamendu — Tue, 12 Feb 2019 00:38:52 GMT

Hi All,I am trying to implement a simple java class for process serviceTask from kickstart app, my ultimate goal to use this class for stencils.I was able to create a app with input from with takes two numbers and serviceTask to add both numbers and returns result.I used 9.0.16, java 8, activiti 6.

Re: ActivitiIllegalArgumentException: org.activiti.BasicAdditionDelegate doesn't implement org.activiti.engine.delegate.JavaDelegate

pault — Tue, 12 Feb 2019 14:54:12 GMT

From a quick look the only differences I can see with my service tasks is that the execute() method throws Execption and explicitly returns, i.e.

public void execute(DelegateExecution e) throws Exception {

.....

return;

}

Re: ActivitiIllegalArgumentException: org.activiti.BasicAdditionDelegate doesn't implement org.activiti.engine.delegate.JavaDelegate

harshamendu — Tue, 12 Feb 2019 15:33:56 GMT

Thanks, PaulT _‌ for your inputs.

I tried with adding "throws Exception" but no luck with the same error.

and "return" method return type is void, do we have to add a return.

I never thought of adding a return to this method.

Do you think that may cause?

Re: ActivitiIllegalArgumentException: org.activiti.BasicAdditionDelegate doesn't implement org.activiti.engine.delegate.JavaDelegate

pault — Tue, 12 Feb 2019 17:31:36 GMT

No I wouldn't have really thought either of those things would be the cause of the problem, but they were the only obvious differences I could see between my service tasks that work - so thought worth mentioning. I'm using the Java API directly in Activiti 5.22.

Re: ActivitiIllegalArgumentException: org.activiti.BasicAdditionDelegate doesn't implement org.activiti.engine.delegate.JavaDelegate

harshamendu — Tue, 12 Feb 2019 18:27:36 GMT

Hmmm. I am using Activiti 6.0.0.

One thing I observed with 6.0 is no longer required to throws Exception.

Only thing I think of now is a version difference. Let me try with 5.22 and see how it goes.