Just recently a user found an issue with the AS 5.1.0 GA http://www.jboss.org/index.html?module=bb&op=viewtopic&t=156075 The issue is similar to what has been discussed sometimes earlier http://www.jboss.org/index.html?module=bb&op=viewtopic&t=92698 http://lists.jboss.org/pipermail/jboss-development/2009-April/014085.html As discussed in those posts, its not possible to correctly figure out the constructor/method that is to be used. But i believe, its possible to write out a meaningful WARN message warning developers of a potential issue with the configuration because of the presence of multiple constructors/method that are a possible match. The issue in AS 5.1.0 GA could have been caught earlier had there been such a WARN message. In the previous forum discussion there was a task which talked about adding this WARN message https://jira.jboss.org/jira/browse/JBMICROCONT-40. The issue is actually resolved, but there are no WARN messages generated for the faulty configurations. Maybe something more has to be done? View the original post : http://www.jboss.org/index.html?module=bb&op=viewtopic&p=4233802#... Reply to the post : http://www.jboss.org/index.html?module=bb&op=posting&mode=reply&a...