how to get user who completed user task in camunda

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I want to get username of user who completed a user task in a camunda process.

for example consider a BMPN with only 2 steps , first is a user task and second is a externalTask. for a invocation of this BPMN if a user completes first user task then i should be able get its username in second externalTask.

I did not find any process variable being set in camunda after user task is complete.



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