[jbpm-users] question about jbpm4

when i use jbpm4.CR1, invoke taskService.findGroupTasks("chief1"), then i can get all tasks not only just for user chief1 and chief1's group chief. i read the TaskQueryImpl.java file, find this appendWhereClause("(participant.userId = :candidateUserId) or (participant.groupId in (:candidateGroupIds) )", hql); seems here lose a (), like this: appendWhereClause("((participant.userId = :candidateUserId) or (participant.groupId in (:candidateGroupIds) ))", hql); so i change the source file , then rebuild this class, that's ok. so who can tell me you also find this problem? why have so simple mistake in this version?