I was wondering about this property too, as this seems a bit confusing. Because which of the following is the correct property to edit: | managedObject.getProperty("driver-class"); | // or: | managedObject.getProperty("config-property").get("DriverClass"); | e.g. if setManagedConnectionFactoryProperties is writing the changes back to the attachment. And you just update "driver-class", without refreshing the MO (and therefore "config-property") - it could persist two different values for "driver-class" (should be the same problem if you do it the other way around). View the original post : http://www.jboss.org/index.html?module=bb&op=viewtopic&p=4212558#... Reply to the post : http://www.jboss.org/index.html?module=bb&op=posting&mode=reply&a...