I am a newcomer to web service, but now I have to simulate ws-businessactivity protocol. I don't have any idea about it and where to begin with. I made an survey about JTA and JTS, but it seems this api only supports ws-atomic transaction. And in WSIT tutorial, there is only one example. Besides, someone suggests to use web service callback (asynchronous) technology. I so hope somebody could give me advices about the way how to do this. Thank you very much.