You can find an example of time-based escalation here:
https://github.com/esteban-aliverti/JBPM-Samples/blob/master/Simple-Event-Samples/src/test/java/org/plugtree/training/jbpm/BoundaryTimerEventProcessTest.java
https://github.com/esteban-aliverti/JBPM-Samples/blob/master/Simple-Event-Samples/src/test/resources/process/boundaryTimerProcess.xml
Unfortunately, the eclipse pluin doesn't support these feature yet. This is why I'm using .xml for the process definition extension :)
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