Recompile with -Xlint:unchecked

   [javac] Note: src/main/java/com/orange/mbs/aiguilleur/ws/WsConfiguration.java 
uses unchecked or unsafe operations.
   [javac] Note: Recompile with -Xlint:unchecked for details.

La solution...

   <target name="compile" description="Compilation of the overall project">

       <mkdir dir="${classes.dir}">
       <javac srcdir="${src.dir}" destdir="${classes.dir}" debug="on" optimize="off" 
deprecation="on" source="1.5" target="1.5">
           <classpath refid="classpath">
           <compilerarg value="-Xlint:unchecked">
       </compilerarg></classpath></javac>
   </mkdir></target>