XA-connections seem to be very complicated. It took us some time to find the right settings. What's the content of XA-Datasource description? Ours is <?xml version="1.0" encoding="UTF-8"?> | <datasources> | <xa-datasource> | <jndi-name>ora-11g</jndi-name> | <track-connection-by-tx/> | <isSameRM-override-value>false</isSameRM-override-value> | <xa-datasource-class>oracle.jdbc.xa.client.OracleXADataSource</xa-datasource-class> | <xa-datasource-property name="URL">jdbc:oracle:thin:@sb2000:1521:11g</xa-datasource-property> | <xa-datasource-property name="User">lafr</xa-datasource-property> | <xa-datasource-property name="Password">...</xa-datasource-property> | <valid-connection-checker-class-name>org.jboss.resource.adapter.jdbc.vendor.OracleValidConnectionChecker</valid-connection-checker-class-name> | <exception-sorter-class-name>org.jboss.resource.adapter.jdbc.vendor.OracleExceptionSorter</exception-sorter-class-name> | <prepared-statement-cache-size>100</prepared-statement-cache-size> | <metadata> | <type-mapping>Oracle9i</type-mapping> | </metadata> | </xa-datasource> | </datasources> | View the original post : http://www.jboss.org/index.html?module=bb&op=viewtopic&p=4237116#... Reply to the post : http://www.jboss.org/index.html?module=bb&op=posting&mode=reply&a...