You must use a proxy mechanism on server side to redirect the call to
appropriate domain. Take a look here, it may help you resolve the
problem using ProxyServlet: 
http://code.google.com/p/acris/wiki/SeparateClientAndServer

On 23. Feb, 16:03 h., ramesh chiluveri <chiluveri...@gmail.com> wrote:
>  Hai All,
>
>  I am trying to develop an application ,which will going to make
> server calls from different domains. I am facing problem with SOP . I
> am not able to make a sever call from different doamin.
>
> Below is the my code.
> When i make rpc call with this code,it is always failing.(onFailure)
>
> import java.util.ArrayList;
> import java.util.HashMap;
>
> import com.google.gwt.core.client.EntryPoint;
> import com.google.gwt.core.client.GWT;
> import com.google.gwt.core.client.JavaScriptObject;
> import com.google.gwt.http.client.RequestBuilder;
>
> import com.google.gwt.user.client.Window;
> import com.google.gwt.user.client.rpc.AsyncCallback;
> import com.google.gwt.user.client.ui.Button;
> import com.google.gwt.user.client.ui.ClickListener;
> import com.google.gwt.user.client.ui.RootPanel;
> import com.google.gwt.user.client.ui.Widget;
>
> /**
>  * Entry point classes define <code>onModuleLoad()</code>.
>  */
> public class invoxwidget  implements EntryPoint,ClickListener{
>
>         public static String userSharedId = "";
>
>         protected HashMap callbacks = new HashMap();
>          protected HashMap scriptTags = new HashMap();
>          protected int curIndex = 0;
>          public Button but  = null;
>         public void onModuleLoad() {
>
>          String serverURL = GWT.getModuleBaseURL()+"?callback=";
>          String callbackName = reserveCallback();
>          setup(this, callbackName);
>          addScript(callbackName, serverURL + callbackName);
>
>         }
>
>          public String reserveCallback()
>          {
>              while (true)
>              {
>               if (!callbacks.containsKey(new Integer(curIndex)))
>               {
>                callbacks.put(new Integer(curIndex), null);
>
>                return "__gwt_callback" + curIndex++;
>               }
>              }
>          }
>
>          /**
>           * <p>Adds the JSONP script to our widget so we can make XSS
> requests baby</p>
>           *
>           * @param uniqueId The unique id of the call
>           * @param url The URL of our Request
>           */
>          public native void addScript(String id, String url)
>          /*-{
>
>              var elem = document.createElement("script");
>              elem.setAttribute("language", "JavaScript");
>              elem.setAttribute("src", url);
>              elem.setAttribute("id", id);
>              document.getElementsByTagName("body")[0].appendChild(elem);
>          }-*/;
>
>          public void handle(JavaScriptObject jso)
>          {
>
>              if( jso != null )
>              {
>
>                 HashMap details = new HashMap();
>                         details.put("userSharedID",userSharedId);
>                         Window.alert("before ContactServer "+userSharedId);
>
>         ContactServer.Util.getInstance().getBusinessName(details,new
> AsyncCallback(){
>
>                 public void onFailure(Throwable arg0) {
>
>                         Window.alert("In onFailure");
>
>                 }
>             public void onSuccess(Object arg0) {
>                                 Window.alert("In onSuccess");
>             }
>          });
>
>          /**
>           *
>           * <p>Sets up our Javascript cross site JSON call</p>
>           *
>           * @param model Handles our Cross Site JSON call
>           * @param callback
>           */
>          public native static void setup(invoxwidget inv, String callback)
>          /*-{
>
>               $wnd.__gwt_callback0 = function(someData)
>               {
>                  alert("inside setup");
>                  i...@com.mantra.invoxwidget.client.invoxwidget::handle(Lcom/
> google/gwt/core/client/JavaScriptObject;)(someData);
>               }
>            }-*/;
>
> }
>
> I am not able to find what is wrong??
>
> Please help me
>
> Thanks
> Ramesh

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