Olá pessoal gostaria de saber o que tem de errado na classe e no xml aseguir pois quando tento acessar a url ele da erro not found 404
package br.com.caelum.servlet;
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 OiMundo extends HttpServlet{
@Override
public void service(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
PrintWriter out = response.getWriter();
out.println("<html>");
out.println("caelum explica");
out.println("</html>");
}
}
<?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>jspTeste</display-name>
<welcome-file-list>
<welcome-file>index.jsp</welcome-file>
</welcome-file-list>
<servlet>
<servlet-name>servletDeTeste</servlet-name>
<servlet-class>br.com.caelum.servlet.OiMundo</servlet-class>
</servlet>
<servlet-mapping>
<servlet-name>servletDeTeste</servlet-name>
<url-pattern>/oi</url-pattern>
</servlet-mapping>
</web-app>