If GenericJBossMarshaller.isMarshallable throws any exception while trying to serialize something like it did in http://pastie.org/1917562, then the original exception is lost and not sent back, so it's hard to figure out the root cause of http://pastie.org/1917310

GenericJBossMarshaller.isMarshallable could log any exception but it's probably better if any exception is propagated back it can be sent back as root cause.