I was looking for the same thing a couple of weeks ago.
I found that Connector/J (the mySQL jdbc connector) does not natively support XA and is only in a kind of beta state with an internal XA emulation.
That is, you can only use basic configuration for mySQL.
JBoss will manage the wrapping to use XA, providing the following warning message.
<warning>
WARN [TxConnectionManager$LocalXAResource] Prepare called on a local tx. Use of local transactions on a jta transaction with more than one branch may result in inconsistent data in some cases of failure.
</warning>
Hope this could help, ionel
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