@WebService(name="StockQuote", serviceName="StockQuoteService")
public class StockQuoteImpl {
        @WebMethod(operationName="getQuote")
       public double getQuote(String ticker) {
                double result = 0.0;
                if (ticker.equals("MHP")) {
                        result = 50.0;
                } else if (ticker.equals("IBM")) {
                        result = 83.0;
                }
                return result;
        }
}

Server Ant Target :
<?xml version="1.0" encoding="UTF-8"?>
<target depends="setup" name="build-server-java">
  <apt debug="${debug}" destdir="${build.classes.home}" fork="true"
    sourcedestdir="${build.classes.home}" sourcepath="${basedir}/src" verbose="${verbose}">
    <classpath>
      <path refid="jaxws.classpath"/>
      <pathelement location="${basedir}/src"/>
    </classpath>
    <option key="r" value="${build.home}"/>
    <source dir="${basedir}/src">
      <include name="**/server/*.java"/>
    </source>
  </apt>
</target>

Client Async Target :

<?xml version="1.0" encoding="UTF-8"?>
<target depends="setup" name="generate-client-async">
  <wsimport debug="${debug}" destdir="${build.classes.home}"
    extension="${extension}" keep="${keep}" verbose="${verbose}" wsdl="${client.wsdl}">
    <binding dir="${basedir}/etc" includes="${schema.binding}"/>
    <binding dir="${basedir}/etc" includes="${client.binding.async}"/>
  </wsimport>
</target>

----- Client with Call back Class
private class GetQuoteCallbackHandler implements AsyncHandler<GetQuoteResponse>{
 private GetQuoteResponse output;
 public void handleResponse (Response<GetQuoteResponse>response)
 {
 try
 { output = response.get ();
 } catch (ExecutionException e)
 { e.printStackTrace (); }
 catch (InterruptedException e)
 { e.printStackTrace (); }
 }
 
 GetQuoteResponse getResponse (){
 return output;
 }
 }

Client :

StockQuote port = new StockQuoteService().getStockQuotePort();
 
 GetQuoteCallbackHandler callbackHandler = new GetQuoteCallbackHandler ();
 
 responseCallback = port.getQuoteAsync ("MHP", callbackHandler);
 while( ! responseCallback.isDone()){
 //some client side processes
 }

 result = callbackHandler.getResponse().getReturn();

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