REST API error: ENGINE-03051 There was an exception while invoking the TaskListener. Message: 'ENGINE-09008 Exception while instantiating class '': ENGINE-09017 Cannot load class

Camunda 7 Topics Discussion & Questions
1

Hi,
I have an issue when try to complete a user task with REST API.
The error message:

Cannot complete task 37c82887-b74a-11ec-b31e-080027519d8d: ENGINE-03051 There was an exception while invoking the TaskListener. Message: 'ENGINE-09008 Exception while instantiating class ‘’: ENGINE-09017 Cannot load class ‘’: ’

It has the same when try to complete from TaskLisk dashboard.

How do I solve or investigate the problem?

2

@bwidyasanyata How do you configure the task listener in the user task??

Also could you post the signature of the class?? Do you have any class level annotations?

3

Hi @aravindhrs, No task listener in my user task. It’s a plain user task which will be completed through a normal REST API method.

4

After I rechecked in my model, there was an “incomplete/premature Java Task Listener definition” which I added on next user task (after user task raised the error) which might this problem occurred.

Thank you!

5

Hi, could you elaborate on what was wrong on your model?
From time to time I have this issue, even in classes / processes that were previously working. Can’t find anything wrong.

6