Let me see if I understand this. You are using JBuilder to generate the client for a web service, but in one case, it does not generate what you expect. Since JBuilder is the one doing the generating, why are you not asking about this on a JBuilder forum? P.S. Please use a more descriptive header in the future. The header should reflect the problem or situation identified by the post, such as "JBuilder web service client using byte[]" View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4167379#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...