Hi! Maybe this simple example can help you to clarify:
https://github.com/calcacuervo/JBPM5-Samples/blob/master/human-tasks/src/test/java/com/test/group/HumanTaskGroupTest.java
jbpm does not keep reference to the association between user and group. Recently it was added a callback interface to integrate with any external system:
https://github.com/droolsjbpm/jbpm/blob/master/jbpm-human-task/src/main/java/org/jbpm/task/service/UserGroupCallback.java
Hope this helps,
Demian
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