I tried to change the database used by activiti-rest to mysql in my localhost by edit the activiti.cfg.xml lies in \activiti-rest\WEB-INF\classes folder .But it doesn't do anything. Who can tell me how to do it?
Yes that's a bug that's fixed in the trunk. For now, delete the activiti.cfg.jar file from the WEB-INF/lib. Then the activiti.cfg.xml configuration should be used.