Thanks for you reply. It a big help for me to hearing jboss will go on maintaining jBPM 4. There are lots of projects are using or planning to use jBPM4 because of its simplity api and database design. But there are still many unfixed issue on the JIRA, we don't known when these issues could be fixed. I known you are very busy, maybe I can do some help for maintaining jBPM4. A clear plan for releasing jBPM4 is very appreciate.

I realized that jBPM5 will focus on BPMN2 stardard implementation, so I think it will be a good message for developer that it can still support jPDL, because the purpose of PVM is provide a platform to support multiple process language. Like at this time, jBPM 4 could support both jPDL4 and BPMN2. A few days early, I did some try on moving BPEL on PVM, the process language definition is not very hard. So If jBPM5 could enhance the PVM, we could custom our own process language on it. I have no doubt that jBPM5 will become a wonderful project.