Thanks for the response. I am very much familiar with log4j. I am already setting all these levels to WARN. Those startup messages still coming up. I think there are some special categories in Jboss that can be specified in the log4j config file. What I need to know are those special categories for which I can set level to WARN.
If you look inside the run.jar file you will find it has its own log4.properties that is used for logging with the bootstrap classes. That logging is set by default to INFO. You need to change that to get rid of the INFO messages from bootstrap (there is probably a way to pass a system property to accomplish the same but I don't know what it is, Adrian might know).
Anyway, unpack run.jar, change setting, pack it up and run again (assuming it is the bootstrap info logging on the console that's bothering you).