/WEB-INF/classess/mine/HelloWorld.java:("mine" fits the below line "package mine;".)package mine;import java.io.*;
import javax.servlet.*;
import javax.servlet.http.*;
public class HelloWorld extends HttpServlet {
    public void doGet(HttpServletRequest request,
            HttpServletResponse response)
            throws ServletException, IOException {
        PrintWriter out = response.getWriter();
        out.println("Hello World");
    }
}/WEB-INF/web.xml:(If not existed yet, create it yourself)<?xml version="1.0" encoding="ISO-8859-1" ?>
<!DOCTYPE web-app PUBLIC
    "-//Sun Microsystems, Inc.//DTD Web Application 1.2//EN"
    "http://java.sun.com/j2ee/dtds/web-app_1_2.dtd">
<web-app>
    <display-name>Hello World</display-name>
    <servlet>
        <servlet-name>HelloWorld</servlet-name>
        <servlet-class>mine.HelloWorld</servlet-class>
    </servlet>
    <servlet-mapping>
        <url-pattern>/Hello</url-pattern >
        <servlet-name>HelloWorld</servlet-name>
    </servlet-mapping>
</web-app>You don't have to compile the *.java, just put *.java under the /WEB-INF/classes/your_package/, Resin will compile it for you.