Not directly an answer or maybe even helpful but have you looked into the Oracle specific JDBC Handlers that are available? They might give more clarity. Oracle handlers in the jboss-common-jdbc-wrapper.jar | org.jboss.resource.adapter.jdbc.vendor.OracleExceptionSorter | org.jboss.resource.adapter.jdbc.vendor.OracleValidConnectionChecker | org.jboss.resource.adapter.jdbc.vendor.OracleXAExceptionFormatter | f.i. using the OracleExceptionSorter: | <exception-sorter-class-name>org.jboss.resource.adapter.jdbc.vendor.OracleExceptionSorter</exception-sorter-class-name> | HTH View the original post : http://www.jboss.org/index.html?module=bb&op=viewtopic&p=4238408#... Reply to the post : http://www.jboss.org/index.html?module=bb&op=posting&mode=reply&a...