I uploaded my .drl file with my bpmn20.XML as Bar file. its running fine.now I wan to change My business rule at run time without uploading again this file.
In the Activiti in Action book I've written an example application that does exactly this. See http://code.google.com/p/activitiinaction/source/browse/trunk/book-rules-app/ So you can edit deployed rules with that application and deploy the changed ones. But under the hood it deploys a new BAR file again, and I don't know if that's what you need. If we would make some changes to Activiti we would also be able to change the rules without the need to redeploy the process definition. But that requires a bit of work.