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Did you see the following tests?

https://github.com/krisv/jbpm/blob/master/jbpm-human-task/src/test/java/org/jbpm/task/service/TaskServiceEscalationBaseTest.java

https://github.com/krisv/jbpm/blob/master/jbpm-human-task/src/test/java/org/jbpm/task/service/mina/TaskServiceEscalationMinaTest.java

and:

https://github.com/krisv/jbpm/blob/master/jbpm-human-task/src/test/resources/org/jbpm/task/QueryData_UnescalatedDeadlines.mvel

This is a low level test that shows how the Escalation works. If you can set up the project in your IDE and debug the tests you will find out how it works.

Greetings.