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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I’ve put together a CanDI binding pattern tutorial (pdf) for four major binding patterns: services, resources, startup, and plugin/extensions.

Focusing on common CanDI patterns should show how CanDI is used in full applications like SubEtha maillist manager, and avoid the temptation to focus on complicated features that only 1% of applications would ever need.

In the tutorial, the key CanDI classes are:

• @Current - the service and unique bean binding annotation.
• @BindingType - the resource custom binding annotation used for declarative injection.
• Instance<T> - the extension/plugin iterator and programmatic bean factor.
• @Any - the special annotation for extension/plugin matching of any registered beans