Based on the information you've provided so far I'd say you simply need more heap space. If you want a deeper investigation than that then you should provide more details about your use-case and the exact circumstances when the error occurs.
If you're use-case is simply "start the messaging server" with the default clustered configuration from Wildfly 8.2 then most (if not all) users should be seeing this same problem. However, to my knowledge this is not a commonly occurring problem. That suggests there's more to your use-case than you're saying.