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Level 3

Thx for the reply, but after I changed the code, it throw another exception:

"java.lang.ClassCastException: com.adobe.idp.taskmanager.dsc.client.task.FormInstanceImpl cannot be cast to com.adobe.idp.taskmanager.dsc.client.task.FormInstance"

that's strange, seems it can't cast the implemented class to the interface class.