Up to the 9.0 release, one of the big support headaches was that for many of the subsystems, the running state was not exportable for analysis; that a transaction running through the system would have different IDs in different subsystems with no way to associate them.
Basically, it was often impossible to tell what the system is actually doing without writing custom patches, which the customer may or may not be willing to install in the production system.
The Diagnostic Service was designed to solve exactly that. I don’t think it provides for it all out of the box, but the hooks certainly are there and I am hoping to see a community form around this service within or outside of BEA.
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