I'm using HttpRequests via RequestBuilder/Request on server side and 
everything is OK. 
I tried to move this operation on server side and at run-time I get 
the following error: 
java.lang.UnsatisfiedLinkError: 
com.google.gwt.xhr.client.XMLHttpRequest.create()Lcom/google/gwt/xhr/ 
client/XMLHttpRequest; 
I am trying to resolve that.can you know that how to resolve that error
My code in server  is:
public String Addcontact(Contact contact) throws Exception
{
 System.out.println("The addcontactserver is"+contact);
connection con =new connection();


String response="";
String firstname=contact.getFirstName();
String lastname=contact.getLastName();
String emailaddress=contact.getEmailAddress();
String 
url=("http://localhost:8080/contactservices/rest/WebService/ADContacts";);
  JSONObject parameters = new JSONObject();
 parameters.put("firstname", contact.getFirstName());
 parameters.put("emailaddress", contact.getEmailAddress());
parameters.put("lastname", contact.getLastName());
 
 System.out.println("The param is"+parameters.toString());
 RequestBuilder builder =new 
RequestBuilder(RequestBuilder.GET,URLEncoder.encode(url));
 builder.setHeader("Content-Type", "application/json");
 builder.setHeader("Accept", "application/json");
 builder.setTimeoutMillis(15000);
 System.out.println("the builder 
is"+builder.getUrl()+','+builder.getHTTPMethod());
 builder.sendRequest(parameters.toString(),new RequestCallback() 
 {
 
 public void onError(Request request, Throwable e) 
         {
             Window.alert(e.getMessage());
         }
        
@Override
public void onResponseReceived(Request request, Response response) {
// TODO Auto-generated method stub
Window.alert(response.getText());
 }
     });
 return response; 
}

}

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