I am working on using Apache soap 2.2 to do login. Here is the piece of code:

I got the SOAPException (SOAP-ENV:client): No Deserializer found to deserialize a ':return' using encoding style 'http://schemas.xmlsoap.org/soap/encoding/'

what is return type from login. Do I need register my own Deserializer.

Could you help me out ?

URL url=null;
String endPointURL = "http://www.salesforce.com/servlet/servlet.SoapApi";

String encodingStyleURI = Constants.NS_URI_SOAP_ENC; //should get from propperties
try {
url = new URL(endPointURL);
}
catch (Exception e){};

System.out.println("url "+url);
// Build the call.
Call call = new Call();

call.setTargetObjectURI("sfconnector:SalesforceConnector");
call.setMethodName("login");
call.setEncodingStyleURI(encodingStyleURI);

Vector params = new Vector();
params.addElement(new Parameter("version", String.class,
"2.0", null));
params.addElement(new Parameter("username", String.class,
"rthurston@aptsoft.com", null));
params.addElement(new Parameter("password", String.class,
"Aptsoft", null));
params.addElement(new Parameter("secure", java.lang.Boolean.class,
(Boolean)(new Boolean(false)),null));
params.addElement(new Parameter("remoteApplication", String.class,
"myApp", null));


call.setParams(params);
System.out.println("params set "+call);


// Invoke the call.
Response resp;
try {
resp = call.invoke(url, "");
}
catch (SOAPException e){
System.out.println("Caught SOAPException (" +
e.getFaultCode() + "): " +
e.getMessage());
return false;
}

// Check the response.
if (!resp.generatedFault()) {
return true;

}
else {

Fault fault = resp.getFault();

System.out.println("Generated fault: ");
System.out.println(" Fault Code = " + fault.getFaultCode());
System.out.println(" Fault String = " + fault.getFaultString());
return true;

}