The Internet is becoming more and more about sharing data, and, uploading files had become nearly universal requirement for a web application. Prior to Servlet 3.0, implementing file upload successfully required external libraries or tedious input processing. Version 3.0 of the spec goes a long way towards providing us with a solution to the problem in a generic and portable way.
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Resin 4.0 introduced Early Access Servlet 3.0 support and, in version 4.0.2, we’ve solidified the implementation. Among many interesting features, Servlet 3.0 introduces annotations that make deploying Servlets, Filters and Listeners of all types easier. This short tutorial opens with the introduction of annotations of javax.servlet.annotation package, shows how to use WebListener, WebServlet, WebFilter and WebInitParam annotations and closes with an example demonstrating a use of IOC (javax.inject package) in a Servlet.
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