GWT RPC: simple msg from server

Question

I want to display a msg from server when user clicks a button on client web page. Here is my code. Can someone see it. It is running but fails when I input name & press button 'Press'.Displays msg 'check ur inputs'

here is stack trace:

[WARN] 404 - POST /lumiproj/testService (127.0.0.1) 1406 bytes
   Request headers
      Host: 127.0.0.1:8888
      Connection: keep-alive
      User-Agent: Mozilla/5.0 (Windows NT 6.1) AppleWebKit/535.7 (KHTML, like Gecko) Chrome/16.0.912.75 Safari/535.7
      Accept: */*
      Accept-Encoding: gzip,deflate,sdch
      Accept-Language: en-US,en;q=0.8
      Accept-Charset: ISO-8859-1,utf-8;q=0.7,*;q=0.3
      Referer: http://127.0.0.1:8888/LumiProj.html?gwt.codesvr=127.0.0.1:9997
      Content-Length: 159
      Origin: http://127.0.0.1:8888
      X-GWT-Module-Base: http://127.0.0.1:8888/lumiproj/
      X-GWT-Permutation: HostedMode
      Content-Type: text/x-gwt-rpc; charset=UTF-8
   Response headers
      Content-Type: text/html; charset=iso-8859-1
      Content-Length: 1406

web.xml

<?xml version="1.0" encoding="UTF-8"?>

http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd" version="2.5" xmlns="http://java.sun.com/xml/ns/javaee">

LumiProjServiceImpl com.hello.server.LumiProjServiceImpl

LumiProjServiceImpl /lumiproj/greet

LumiProj.html

entrypoint class

package com.hello.client;

//import rpctest.client.RpctestService;
//import rpctest.client.RpctestServiceAsync;

import com.hello.shared.FieldVerifier;
import com.google.gwt.core.client.EntryPoint;
import com.google.gwt.core.client.GWT;
import com.google.gwt.event.dom.client.ClickEvent;
import com.google.gwt.event.dom.client.ClickHandler;
import com.google.gwt.event.dom.client.KeyCodes;
import com.google.gwt.event.dom.client.KeyUpEvent;
import com.google.gwt.event.dom.client.KeyUpHandler;
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.DialogBox;
import com.google.gwt.user.client.ui.HTML;
import com.google.gwt.user.client.ui.HorizontalPanel;
import com.google.gwt.user.client.ui.Label;
import com.google.gwt.user.client.ui.RootPanel;
import com.google.gwt.user.client.ui.TextBox;
import com.google.gwt.user.client.ui.VerticalPanel;

/**
 * Entry point classes define <code>onModuleLoad()</code>.
 */
public class LumiProj implements EntryPoint {

    final TextBox nameText = new TextBox();
    final Label nameLabel = new Label("Enter name");
    final Button pressBtn = new Button("Press!");
    final Button exitBtn = new Button("exit");
    //final Label errorLabel = new Label();
    private VerticalPanel mainpanel = new VerticalPanel();
    private HorizontalPanel addpanel1 = new HorizontalPanel();
    private HorizontalPanel addpanel2 = new HorizontalPanel();




    private final LumiProjServiceAsync calNumbers = GWT
            .create(LumiProjService.class);

    /**
     * This is the entry point method.
     */
    public void onModuleLoad() {

        addpanel1.add(nameLabel);
        addpanel1.add(nameText);
        addpanel2.add(pressBtn);
        addpanel2.add(exitBtn);
        mainpanel.add(addpanel1);
        mainpanel.add(addpanel2);

        pressBtn.addClickHandler(new ClickHandler() {

            @Override
            public void onClick(ClickEvent event) {

            String name = nameText.getValue();  

            calNumbers.calNumbers(name,
                new AsyncCallback<String>() {
                public void onFailure(Throwable caught) {
                    // Show the RPC error message to the user
                        Window.alert("check your inputs");
                    }

                @Override
                public void onSuccess(String result) {
                // TODO Auto-generated method stub
                    Window.alert("answer="+result);
                }
            });}
        });
        // We can add style names to widgets
        //sendButton.addStyleName("sendButton");

        // Add the nameField and sendButton to the RootPanel
        // Use RootPanel.get() to get the entire body element

        /*RootPanel.get("nameFieldContainer").add(nameField);
         * 
        RootPanel.get("sendButtonContainer").add(sendButton);
        RootPanel.get("errorLabelContainer").add(errorLabel);*/
        RootPanel.get().add(mainpanel);

    }
}

service interfaces:

package com.hello.client;

import com.google.gwt.user.client.rpc.RemoteService;
import com.google.gwt.user.client.rpc.RemoteServiceRelativePath;

@RemoteServiceRelativePath("testService")
public interface LumiProjService extends RemoteService {

    String calNumbers(String name) throws IllegalArgumentException;
}

------------------
package com.hello.client;

import com.google.gwt.user.client.rpc.AsyncCallback;

public interface LumiProjServiceAsync {

    void calNumbers(String name,
            AsyncCallback<String> callback);
}

serviceIMPL

package com.hello.server;

import com.hello.client.LumiProjService;

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

public class LumiProServiceImpl extends RemoteServiceServlet  implements LumiProjService {

    @Override
    public String calNumbers(String name) throws IllegalArgumentException {

        String h = "Hello";

        return h+" "+name;
    }
}

Vladimir Korobkov Vladimir Korobkov · Accepted Answer · 2012-01-22T16:20:31

Can you post gwt error stack trace(if exists) or text of Throwable in

    public void onFailure(Throwable caught)

Also, post please your web.xml file, may be there is error in servlet path mapping

GWT RPC: simple msg from server

1 Answers