tomcat 一直报404，求指导

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

xmlns="http://java.sun.com/xml/ns/javaee"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://java.sun.com/xml/ns/javaee
http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd">

Hello
com.owenqing.HelloTest


Hello
/Hello

package com.owenqing;

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

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

public class HelloTest extends HttpServlet {

@Override
protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
    System.out.println("doGet method");
    super.doGet(req, resp);
}

@Override
protected void service(HttpServletRequest arg0, HttpServletResponse arg1) throws ServletException, IOException {
        System.out.println("service method");
        PrintWriter out=arg1.getWriter();
        out.print("hello world");
        out.close();

    super.service(arg0, arg1);
}

}

路径问题，找找相应的绝对路径相对路径怎么设置