How to get all completed tasks via Java

[Skyor]

I am using alfresco remote api and I need to get all users completed tasks. I have an updated TaskInstancesGet.java file that returns the current tasks of all users, but without a specific workflowInstanceId, I cannot get completed tasks. Help me please.

[abhinavmishra14]

Have you tried WorkflowService:

https://dev.alfresco.com/resource/docs/java/org/alfresco/service/cmr/workflow/WorkflowService.html

Alternate JS API: https://docs.alfresco.com/6.0/references/API-JS-WorkflowManager.html