Migration from Weblogic 8.1 to Weblogic 10

I am migrating to WebLogic 10 from Weblogic 8.1. When I created the JAR  file
with clientgen element (Web service ant task) for WebLogic 10, I got less Java
class files and a different structure of subfolders in the JAR file in
comparison with the old JAR file created for WebLogic 8.1

I think I have to change the Java code for Web service in WebLogic 10, and my
question is: How to access Web Service Clients (or how to use Web Service
Clients) in WebLogic 10 in comparison with WebLogic 8.1 ? There is not enough
BEA documentation regarding this.

Thanks,