Java Service -> ext Java library (rabbit MQ client library -> Service.doInvoke fails

Sounds good for the first try as long it is a pure Java API.
In this case the Rabbit MQ API will only be available in this package and the packages which have declared to be dependent on this one.

When exchanging the jar for a newer version remember to reload the package to make it active.

I agree with MR that the fix should be shared with the community for other members having the same issue.

Regards,
Holger