Google Guice - a DependencyInjection framework.  (DI may also be called InversionOfControl (IoC).)

* http://code.google.com/p/google-guice/
** ''"Put simply, Guice alleviates the need for factories and the use of new in your Java code. Think of Guice's @Inject as the new new. You will still need to write factories in some cases, but your code will not depend directly on them. Your code will be easier to change, unit test and reuse in other contexts."''
* http://en.wikipedia.org/wiki/Google_Guice
** ''"Google Guice is an open source software framework for the Java platform released by Google under an Apache license. It provides support for dependency injection using annotations to configure Java objects."''
* http://www.theserverside.com/news/thread.tss?thread_id=44593 - '''"Google Guice, A Java Dependency Injection Framework"'''

Extensions:
* http://www.wideplay.com/