I'm learning with Lars Vogel's tutorial on http://www.vogella.com/articles/EclipseWTP/article.html and I'm stuck with a 404 error. So I created a Dynamic Web Project in Eclipse and then created FileDao.java and FileCounter.java according to the tutorial. And Eclipse generated a web.xml file for me, here it is:
<?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_2_5.xsd" id="WebApp_ID" version="2.5">
<display-name>de.vogella.wtp.filecounter</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>
<servlet>
<description></description>
<display-name>FileCounter</display-name>
<servlet-name>FileCounter</servlet-name>
<servlet-class>de.vogella.wtp.filecounter.servlets.FileCounter</servlet-class>
</servlet>
<servlet-mapping>
<servlet-name>FileCounter</servlet-name>
<url-pattern>/FileCounter</url-pattern>
</servlet-mapping>
</web-app>
I'm using Tomcat 6.0 and I chose Dynamic web module version 2.5 while creating the project.