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
I changed the classname="com.sun.tools.ws.ant.WsImport" to classname="com.sun.tools.ws.WsImport", which fixed this issue for me.
classname="com.sun.tools.ws.ant.WsImport"
classname="com.sun.tools.ws.WsImport"