Re: GWT servlet access

On Friday, 03 June, 2011 04:30 AM, khiem nguyen wrote:
> 404 means not found
>
> try to print out your request-url first to see if it matches
> host:port/mycompany/sayHello or not.
> i think it will not match, your request url will also include your
> gwt-module-name in the path
>
>
>
> On Thu, Jun 2, 2011 at 8:15 PM, Ybrek
> <xybrek@gmail.com
> <mailto:xybrek@gmail.com>> wrote:
>
> 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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Hi thanks, the problem is with the url-pattern and how I call it with
the RequestBuilder. Works now. -Xybrek

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