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It would be helpful to be able debugging messages between different JBI components. The CASA editor looks like a good candidate of debugging UI. It can be used for setting new breakpoints and tracking complex process execution state. Now we have BPEL debugger and it works perfect. But sometimes it's necessary to know what happens outside of BPEL.
It's important to note that this is no easy task, as there is essentially nothing to _debug_ in a composite application, since unlike BPEL there is no execution _flow_. We will have a debugger in Fuji, which does have a message flow. For comp app in its current form we could possibly allow monitoring messages going in/out of endpoints, but that would not be real debugging.