I have a web.xml file under the WEB-INF directory:
<?xml version="1.0" encoding="ISO-8859-1"?>
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The ASF licenses this file to You under the Apache License, Version 2.0
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At quick glance I see two mistakes:
1) Classes ought to be placed in packages. There are circumstances wherein packageless servlets work, but you should never make your application dependent on that. That's a bad practice.
2) url-pattern is relative to the context root. So with this configuration your servlet is effectively to be accessed as http://localhost:8080/review/review
I'd to say, go through a decent JSP/Servlet tutorial or book. This all is namely fairly trivial.