Hi Jaikiran, thanks for helping. Well, before reading your answer, I did some googling and found a link where someone had previously encounter that error : http://venugopaal.wordpress.com/ I did what he suggested, I modified the file bossts-properties.xml (jbossjta-properties.xml was merged) and added the following line : | <property name="com.arjuna.ats.jta.allowMultipleLastResources" value="true" /> | And it works. But I would like to understand what was wrong : some issue with the arjuna API ? View the original post : http://www.jboss.org/index.html?module=bb&op=viewtopic&p=4266995#... Reply to the post : http://www.jboss.org/index.html?module=bb&op=posting&mode=reply&a...