Removing #WebServlet causes java.lang.ClassNotFoundException - eclipse

Question

I'm using Tomcat 7 in eclipse Juno with servlet 3.0 specs (jdk 1.7).
When I create a new servlet using Eclipse IDE it automaticaly create a new mapping using #WebServlet("/foo") statement and everything works fine (the servlet works).
Removing the #WebServlet("/foo") mapping and using the manual one in web.xml:
<web-app>
<servlet>
<servlet-name>Servlet1</servlet-name>
<servlet-path>foo.Servlet</servlet-path>
</servlet>
<servlet-mapping>
<servlet-name>Servlet1</servlet-name>
<url-pattern>/foo</url-pattern>
</servlet-mapping>
</web-app>
causes Tomcat crash:
SEVERE: Allocate exception for servlet java.lang.ClassNotFoundException:
I'm sure that foo.Servlet.Servlet1 is the correct path and name.
I've to manually compile the servlet before starts Tomcat? I run the project directly from eclipse ide, setting up a Tomcat 7 Runtime Environment.

Answer 1

Your Servlet declaration in web.xml is not correct, You need to change
<servlet-path>foo.Servlet</servlet-path>
with
<servlet-class>foo.Servlet</servlet-class>
Also you should add the schema declaration in your web.xml file, it would have saved you all this trouble by showing the error in your xml editor because there is nothing such as <servlet-path> in it.
<?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"
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">