GWT servlet access

Hi i'm trying to access a simple servlet from within GWT (dev mode):

The basic idea is to get the simple response from the servlet and then
show it to GWT client side.

I think I'm missing something here or have misconfigured the code, I
presume in the RequestBuilder part or in the url-pattern. I'm always
getting 404 response.

Can anyone help? Cheers, Ybrek

SayHelloServlet.java

package com.mycompany.server;

import java.io.*;
import javax.servlet.*;
import javax.servlet.http.*;

public class SayHelloServlet extends HttpServlet {
public void doGet(HttpServletRequest request,
HttpServletResponse response)
throws ServletException, IOException {
PrintWriter out = response.getWriter();
out.println("Hello!!!");
}
}

ServletDemo.java

package com.mycompany.client

public class ServletDemo implements EntryPoint {
..
public void onModuleLoad() {
...
makeServletCall();
...

}
..
public void makeServletCall() {
String url = GWT.getHostPageBaseURL() + "sayHello";;
RequestBuilder builder = new RequestBuilder(RequestBuilder.GET,
URL.encode(url));

try {

builder.sendRequest(null, new RequestCallback(){

public void onError(Request request, Throwable exception) {
Window.alert("Error ("+ exception +")");
}

public void onResponseReceived(Request request,
Response response) {
if (200 == response.getStatusCode()) {
Window.alert("the string: "+ response.getText());
}
else {
// Handle the error. Can get the status text from
response.getStatusText()
Window.alert(" Connected with error(maybe): " +
response.getText());
}

}});

} catch (Exception e) {
GWT.log(e.toString());
Window.alert("Whoosps " + e.toString());
}
}
...
}

Here's the web.xml in the war folder:

web.xml

<web-app>
...
<servlet>
<servlet-name>sayHelloServlet</servlet-name>
<servlet-class>com.mycompany.server.SayHelloServlet</servlet-
class>
</servlet>

<servlet-mapping>
<servlet-name>sayHelloServlet</servlet-name>
<url-pattern>/mycompany/sayHello</url-pattern>
</servlet-mapping>
...
</web-app>

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