NetBeans 6.5: Problems building WSDL Java apps after upgrade from 6.1

I recently updated to NetBeans 6.5 and a WEB Services client stopped working. At build time I got the following error message:

C:\myproject\JavaApplication29\nbproject\jaxws-build.xml:10: taskdef A class needed by class com.sun.tools.ws.ant.WsImport cannot be found: com/sun/istack/tools/ProtectedTask

I fixed the problem by adding:
   <classpath path="${libs.jaxb.classpath}"/>
to jaxws-build.xml

 <target name="wsimport-init" depends="init">
  <mkdir dir="${build.generated.dir}/wsimport/client"/>
  <mkdir dir="${build.generated.dir}/wsimport/binaries"/>
  <taskdef name="wsimport" classname="com.sun.tools.ws.ant.WsImport">
    <classpath path="${libs.jaxws21.classpath}"/>

    <classpath path="${libs.jaxb.classpath}"/>
  </taskdef>
 </target>