How to use task as parameter?

when I use the Internal Context Variables “task” it’s make an error.

The process model fragment is shown below:

 <bpmn:userTask id="Activity_1o3jw90" name="数据审批" camunda:assignee="${commonService.assignee(execution)}">
        <camunda:taskListener expression="${commonService.assignee(task)}" event="complete" />

Then when I execute the process I get the following error :slight_smile:

An error happened while submitting the task form :
Cannot submit task form e2efe5a6-ff81-11ed-ae28-005056c00001: ENGINE-03051 There was an exception while invoking the TaskListener. Message: 'Error while evaluating expression: ${commonService.assignee(task)}. Cause: Cannot coerce from class org.camunda.bpm.engine.impl.persistence.entity.TaskEntity to interface org.camunda.bpm.engine.delegate.DelegateExecution'

What should I do?
Thanks a lot.

  • I found the reason, I used Java overloading caused.
    String assignee(DelegateTask delegateTask);
    String assignee(DelegateExecution delegateExecution);

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