Maybe this test could shed some light:
https://github.com/esteban-aliverti/JBPM-Samples/blob/master/Simple-Task-Life-Cycle-Sample/src/test/java/org/plugtree/training/jbpm/EscalationProcessTest.java
You can download the whole test suit from https://github.com/esteban-aliverti/JBPM-Samples
Best Regards,
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