Unable to call GWT-RPC from client side application

Question

Iam completely new gwt-rpc. I have read few documentation, but not clear at one point. Iam going to describe it.

My client side build is going to implement gwt-rpc to call the server side servlets to access the data. So, do i need to implement server side RPC too?

Means, will client side gwt-rpc will communicate with server side RPC, and that server side rpc will communicate with the servlets? or directly client side gwt-rpc will communicate with servlets?

Thanks

Answer 1

Yes, you need to implement server side RPC too.

You have to build a Servlet in your server side, which must extends the class com.google.gwt.user.server.rpc.RemoteServiceServlet and implements your RPC interface. You have to register this new Servlet which you have implemented in your web.xml. For example.

Your new Servlet:

import com.google.gwt.user.server.rpc.RemoteServiceServlet;

public class MyServerSideRPC extends RemoteServiceServlet implements MyRpcInterface{
   @Override
   public String myRpcMethod(....)  {
    //Do RPC method work
   }

}

Your RPC interface which is implemented by your new Servlet

 @RemoteServiceRelativePath("service/myrpcpath")
 public interface MyRpcInterface extends RemoteService{
  public String myRpcMethod(....);
 }

And in your web.xml on your server side, register the servlet you have created,

<servlet>
    <servlet-name>MyServerSideRPC</servlet-name>
    <servlet-class>.....MyServerSideRPC</servlet-class>
</servlet>

<servlet-mapping>
    <servlet-name>MyServerSideRPC</servlet-name>
    <url-pattern>/gwtrpc/service/myrpcpath</url-pattern>
</servlet-mapping>