Hi,
This definitely seems to be a different error:
Caused by: java.lang.IllegalArgumentException: Named query not found: UnescalatedDeadlines
It's not picking up the query, which is defined in the Taskorm.xml file:
https://github.com/droolsjbpm/jbpm/blob/master/jbpm-human-task/jbpm-human-task-core/src/main/resources/META-INF/Taskorm.xml#L938
This config file should be part of the jbpm-human-task-core jar
In your persistence.xml, do you have a reference to this config file (so it knows to load it), something like:
<mapping-file>META-INF/Taskorm.xml</mapping-file>
Looking at your server log, it seems it's trying to load it, but fails:
15:44:18,871 INFO [org.hibernate.ejb.Ejb3Configuration] (MSC service thread 1-2) HHH00360:Unable to resolve mapping file [classpath:Taskorm.xml]
Could it be that you missed the META-INF folder?
Kris