[Axis2][Axis 1.4.1]Look for the Workable Sample Codes Related to Asynchronous Web Service Invocation

[浮生半世情]

Dears:
         I have one problem needed your recommendations. At present, I want
to code my web service client with non-blocking or asynchronous manner. It
measn once my client sends its requests, it can do other things continually
without waiting for its replies. However, I still have not found any
suitable sample codes after surveying many on-line documentations or
materals.
         Since I use the Axis 1.4.1 version, I found some on-line sample
codes use those deprecated classes or methods. Therefore, anyone can give me
the workable sample codes. I will appreciate your assistances.
         In addition, I need to handle the replied data even if I use the
asynchronous web service. So, the sample code should demonstrate how to get
the replied data. Because I aslo find some on-line code doesn't claim the
following story after asynchronous web service invocation looked like the
following code snippet.


try {
         org.apache.axis2.userguide.Axis2SampleDocLitServiceStub stub
           = new
org.apache.axis2.userguide.Axis2SampleDocLitServiceStub(null,
             "http://localhost:8080/axis2/services/Axis2SampleDocLitService
");
             //implementing the callback online

org.apache.axis2.userguide.Axis2SampleDocLitServiceCallbackHandler callback
=
            new
org.apache.axis2.userguide.Axis2SampleDocLitServiceCallbackHandler() {
                    public void receiveResultechoString(

org.apache.axis2.userguide.xsd.EchoStringReturnDocument resDoc) {
                       System.out.println(resDoc.getEchoStringReturn());
                       }
            };
        org.apache.axis2.userguide.xsd.EchoStringParamDocument reqDoc =

org.apache.axis2.userguide.xsd.EchoStringParamDocument.Factory.newInstance();
           reqDoc.setEchoStringParam("Axis2 Echo");
            stub.startechoString(reqDoc, callback);
           // After the above line, I don't know how to get the replied data
        } catch (java.rmi.RemoteException e) {
          e.printStackTrace();
       }