Hi Ant,
Its a different version of the source but here is the message:
https://github.com/ironjacamar/ironjacamar/blob/master/deployers/src/main/java/org/jboss/jca/deployers/DeployersLogger.java#L171
The think about JBoss logging is that it uses a few variables to end up with the message id it prints out - I have been bitten by that before so usually I would just search for the numeric part of the string, in your case 20016.
Hope that helps you to debug this further,
Tom