sendReceive() catching NullPointerException

[yigang.chen]

Hi,
 
I'm new to Axis2. As my first Axis2 web service project I followed the
quickstart in creating/deploying a web service and writing a client to
access the service. 
 
Here's my client code:
 
-------------------------web service client---------------------------
  public class CSXStub {
    private String query;
    
    public CSXStub() {
      this.query = null;
    }

    public void setQuery(String qry) {
      this.query = qry;
    }

    public String getQuery(){
      // create request payload
      OMFactory fac = OMAbstractFactory.getOMFactory();
      OMNamespace ns =
fac.createOMNamespace("http://ws.apache.org/axis2/xsd";, "ns1");
      OMElement method = fac.createOMElement("Search", ns);
      OMElement value = fac.createOMElement("query", ns);

      value.addChild(fac.createOMText(value, query));
      method.addChild(value);

      // create service client
      ServiceClient client;
      OMElement res;

      try {
        client = new ServiceClient();
      } catch (AxisFault e) {
        return "Failed creating Axis2 client object: " + e.getMessage();
      }

      // create option object
      Options opts = new Options();

      //setting target end point reference
      EndpointReference epr = new EndpointReference(
 
"http://localhost:8080/axis2/services/CSXService";);
      opts.setTo(epr);

      //Setting action, and which can be found from the wsdl of the
service
      opts.setAction("urn:echo"); */
      client.setOptions(opts);

      // invoking service
      try {
        res = client.sendReceive(method);
      } catch (AxisFault e) {
        return "Failed calling CSX web service: " + e.getMessage();
      }

      return res.getFirstElement().getText();
    }
  }
----------------------------------------------------------------------

I imported this class into a JSP page. In invoking that JSP the last
catch fired and returned the error message:

  Failed calling CSX web service: java.lang.NullPointerException

What did I go wrong here?

Thanks,
Yigang

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