Description of problem: An attempt made to complete a workitem created in jbpm5 fails with "No strategy of type org.drools.marshalling.impl.SerializablePlaceholderResolverStrategy available." The issue is probably caused by refactoring. Looks like the class exists in package org.drools.core.marshalling.impl.
Created attachment 788351 [details] stack
The tested process is BPMN2-UserTask.bpmn2 available in the jbpm repository. It's not using the DoNothingWorkItemHandler.
I meant to write "it IS using the DoNothingWorkItemHandler".
http://github.com/droolsjbpm/drools/commit/95583e5de
Verified on ER3.