I saw the same issue in many different locations and even after a good portion of googling, I could not resolve it. What I am trying to do (the bigger picture) is to go through
Better still, you can use the command line tool wsimport to generate the jar or files
http://docs.oracle.com/javase/6/docs/technotes/tools/share/wsimport.html
generate the files into the build/classes folder, you can then reference it from there with ant javac