"grdzeli_kaci" wrote : | i thought that is is possible to change anything in ha-xa-datasource and i could manage datasources. | ha-xa-datasource is basically used for load balancing at the Jboss side . If you are trying to implement your custom load balancer logic then implementing URLSelector strategy would be fine . If switching of the ds in your application is specific to your business logic then implementing URLSelector does not make sense although you can have the BL implemented in URLSelector implementation which would be disaster. View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4082069#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...