When creating a Servlet using the New File - Servlet wizard in a Dynamic Web Project in a clean workspace, the web.xml file is not properly created. Specifically, this is what gets generated;
<?xml version="1.0" encoding="UTF-8"?>
<web-app id="WebApp_ID" version="2.4" xmlns="http://java.sun.com/xml/ns/j2ee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://java.sun.com/xml/ns/j2ee http://java.sun.com/xml/ns/j2ee/web-app_2_4.xsd">
<display-name>
DemoFlaw</display-name>
<servlet>
<description>
</description>
<display-name>
DemoServlet</display-name>
<servlet-name>DemoServlet</servlet-name>
<servlet-class>
org.ccccd.webone.DemoServlet</servlet-class>
</servlet>
<servlet-mapping>
<servlet-name>DemoServlet</servlet-name>
<url-pattern>/DemoServlet</url-pattern>
</servlet-mapping>
<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>
</web-app>

The extra whitespace at the end of the start tag <servlet-class> causes the deployment to fail. This is occuring on 100% of the computers in the Java Web Class that I am teaching.

-Steve