error adding handler to webservice

hi,

i am trying to add an web service handler following the tutorial

http://www.netbeans.org/kb/50/quickstart-webservice.html

i am using netbeans 6 and jboss application server

when i add MyHandler the class is generated like this

public class MyMessageHandler extends javax.xml.rpc.handler.GenericHandler {

...

}

but when i try to confige the handler on my webservice

i got

you selected a class that is not a message handler . Message Handler classes
should implement javax.xml.ws.handler.LogicalHandler or implement
javax.xml.ws.handler.Handler

what might be wrong?