"maralcbr" wrote : | As I could see JBossTS does not allow more than one 1PC resource per transaction. Two datasources pointing to the same database are considered two resources. Right? | Yes these are considered as two resources. Please go to the transaction user forum for Transaction related queries , this is JCA forum. Anyway have a look at the following link it will explain why having multiple one phase participants in JTA transaction are unsafe . http://wiki.jboss.org/wiki/Wiki.jsp?page=Multiple1PC View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4137886#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...