servlet错误The requested resource is not available

Question

初学jsp，servlet的错误，
servlet：
import java.io.*;
import javax.servlet.*;
import javax.servlet.http.*;

public class HelloWorld extends HttpServlet{

public void doGet(HttpServletRequest request,HttpServletResponse response)
    throws IOException,ServletException{

    PrintWriter out = response.getWriter();

    out.println("Hello World!");
}

}

web.xml：

<?xml version="1.0" encoding="ISO-8859-1"?>

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"
version="2.5">

Welcome to Tomcat

Welcome to Tomcat

<servlet>
    <servlet-name>HelloWorld</servlet-name>
    <servlet-class>HelloWorld</servlet-class>
</servlet>
<servlet-mapping>
    <servlet-name>HelloWorld</servlet-name>
    <url-pattern>HelloWorld</url-pattern>
</servlet-mapping>

文件位置：

错误信息：

Answer 1

要看web.xml文件中配置的servlet路径与请求的servlet的路径不一致。servlet应该被部署到classes目录下。