anonymous wrote : no-tx-separate-pools: The presence of this element indicates that two connection pools are required to isolate connections used with JTA transaction from those used without a JTA transaction. The pools are lazily constructed on first use. Its use case is for Oracle (and possibly other vendors) XA implementations that don't like using an XA connection with and without a JTA transaction. http://docs.jboss.org/jbossas/jboss4guide/r5/html/ch7.chapt.html Configure no-tx-seperate-pools in your xa-datasource configurations files . Also check this http://bugs.mysql.com/bug.php?id=12935 If this does not work I will investigate this in more detail . View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4157116#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...