Best Java libraries in 2011 [closed]

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What Java libraries would you recommend in the 2011?

I know that there were some question like that, but I'm also interested in new libraries开发者_开发问答.

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The question is a little vague as Java is such a huge field today.

Are you talking about desktop development? Mobile (Android) development? Server-side?

At least for the server-side, which is represented by Java EE the trend is to use less libraries. A lot of the functionality that is required by most applications is already part of the Java EE 6 platform. Additional libraries are still useful for e.g. extra UI components (PrimeFaces, RichFaces, etc).

Seam 3 though does seem to provide some interesting technology and might be a useful extra library when you use Java EE.

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Libraries for what? General purpose? Bayesian analysis? Image manipulation?

Other than the JDK itself, there's quite a good collection over at Apache Commons, but the question is so vague I have no idea if that's what you're looking for...