All Oracle related issues are resolved which was creating problem to execute Personal task from installer's sample Evaluation workflow.
Basically,I fixed/modified couple of classes in "jbpm-human-task" module which was throwing ORA 00903,01747 etc. such as-
-PeopleAssignment (modified some of the reference table and columns name to reduce the size<30 characters )
-TaskData
-Attachment (modified column names)
-User,Group,Comment (renamed table because it was using Oracle's reserved keyword)
* Still that User,Group table is not created in my database schema thogh I renamed,I can see "Comment" table in my schema
* TaskData,Delegation,EmailNotification,PeopleAssignments etc. from persistence.xml has not been created yet (not sure why)
Could be these classes are of type "Embeddable"
Now sample task can be excuted end-to-end with oracle DB
Thanks,
Anand