This week's book giveaway is in the OCPJP forum. We're giving away four copies of OCA/OCP Java SE 7 Programmer I & II Study Guide and have Kathy Sierra & Bert Bates on-line! See this thread for details.
Hmm... Assuming that am calling setRollbackOnly() in a CMT bean whose business method has a transaction attribute, NotSupported or Never, then an exception should definitely be thrown coz there is no active transaction available for rollback.