Huisheng,
Thanks to your reply. Now my code can run on jbpm 4.4, but I run into a new issue -- no history data are stored in jbpm history tables. I don't have these issues in jbpm 4.2. Is there any new change on history event support in jbpm 4.4? I checked dev guide, could not find any clue.
I attached the jbpm.cfg.xml. Wonder if need some changes in this file.
Thanks ahead,