rpc call - static methods is not working

Hi everyone,

I am trying to define a static method in the service interface to make an rpc call. But it doesn't allow me to do so. here I am pasting my code

Client class 

public void sendDomesticData(String product,String dma,String yrmnths,String dist,String metrics) {

String url = GWT.getModuleBaseURL() + "domesticservice";

domesticServiceAsync = (DomesticServiceAsync) GWT

.create(DomesticService.class);

ServiceDefTarget endpoint = (ServiceDefTarget) domesticServiceAsync;

endpoint.setServiceEntryPoint(url);

domesticServiceAsync.sendDomesticData(product,dma,yrmnths,dist,metrics,new Domestichandler<Void>() );

}

public class Domestichandler<Void> implements AsyncCallback<Void> {

@Override

public void onFailure(Throwable caught) {

String error = caught.getMessage();

System.out.println(error);

}

public void onSuccess(Void result) {

System.out.println("perfect");

}

}

Service 

public interface DomesticService extends RemoteService {

public  void sendDomesticData(String product,String dma,String yrmnths,String dist,String metrics);

}

public interface DomesticServiceAsync {

void sendDomesticData(String product,String dma,String yrmnths,String dist,String metrics,AsyncCallback<Void> callback);

}

server side -

public  void sendDomesticData(String product, String dma,

String yrmnths, String dist, String metrics) {

System.out.println(product);

}

Basically I am trying to send the values from the front interface to the  server side and I don't want any return value. But the values passed to the server side should be stored globally in the server class so i can access those values in different method. I tried changing all the senddomestic values to static but it won't allow me to do so? why? 

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