HTTP Status 404 using Servlet 3.0

[Alexander Sales]

Hi all,

I am new to servlet 3.0. I'm using Eclipse Indigo(3.7) and Tomcat 7.0.20.

I want to load my code to the browser using this url - http://localhost:8080/SCWCD/HelloWorld
but it returns the HTTP status 404.

HelloWorld.java

package com.scwcd6.servlet;

import java.io.IOException;
import java.io.PrintWriter;

import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;


@WebServlet("/HelloWorld")
public class HelloWorld extends HttpServlet {
	private static final long serialVersionUID = 1L;


    @Override
	public void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
		PrintWriter out = response.getWriter();
		out.println("Hello World");
	}
    
    
    
}

I generated also a web.xml

<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://java.sun.com/xml/ns/javaee" xmlns:web="http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd" id="WebApp_ID" version="3.0">
  <display-name>SCWCD</display-name>
  <welcome-file-list>
    <welcome-file>index.html</welcome-file>
    <welcome-file>index.htm</welcome-file>
    <welcome-file>index.jsp</welcome-file>
    <welcome-file>default.html</welcome-file>
    <welcome-file>default.htm</welcome-file>
    <welcome-file>default.jsp</welcome-file>
  </welcome-file-list>
</web-app>

After helping me out with loading it into the browser, now my question is does servlet 3.0 still needs web.xml to load this simple app?

Anyway, your help is highly appreciated!

[N Sahni]

Hi,

It works absolutely fine. Try creating war and then deploying it in Tomcat, make sure that the directory structure is correct.

Also, web.xml is optional in servlet 3.0, you can try removing web.xml from war and running it againg. It'll give you the same results.

[Alexander Sales]

Thanks Sahni,

I'm running tomcat on eclipse. Is there a problem with my setup using eclipse? Or it doesn't work when servlet 3.0 is run on eclipse, browser would not be able to find the servlet.

[N Sahni]

Not sure. Ideally it should work with eclipse as well. Just verfiy what folder structure eclipse is generating.

I just manually created required folder structure in tomcat webapps and added the class file in WEB-INF/classes.

[Alexander Sales]

Ok, for the meantime I will do it your way

[Alexander Sales]

Now i found the error, i changed my system environment variable from 'JAVA_HOME' to 'JAVA_HOME2'. Catalina file defaults to JAVA_HOME and it can't start tomcat normally where the program was deployed because it needs either jdk or jre.


Cheers,
Alex Sales.