hi again, no one here who can help me with this issue? Maybe my description of the problem is hard to understand. so I'll try to make it more clear. First I have written a web service with a parameter and a return value. the method is something like: returnValue calculate (List<Car> carList){...} The parameter is something like: class car{...} class cheep extends car{...} class cabrio extends car{...} so I added the @XmlSeeAlso ({cheep.class, cabrio.class}) annotation to the Car class. I can now deploy the web service and the wsdl gets generated in a proper way. The first thing I did to test the service was writting a simple client which creates a cheep and a cabrio instance and adds these two instances to a list and passes it to the web service. For this I used the classes I coded. With this setup everything worked fine and the service was able to cast the list members to the proper type. So the type substitution worked well. But I need the test the Schema2Java approach, too. So I consumed the WSDL with wsconsume and the -t 2.1 switch. I addopted the client to use the generated classes. But here the type substitution doesn't work. Only a list of car instances gets passed to the service. Anybody here who has a clue on how to fix this problem? Thanks in advance. Greetings m_schumpa View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4074455#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...