There are similar projects to Java libraries like Apache Commons?

I want to know if there are another projects to provide libraries for Java like the Apache Commons project. I got some useful things like Logging, ConnectionPool, Configurations, etc. from it, but maybe there is something that开发者_如何学Go it won't cover.

At the moment, I don't need anything specific, but only want to know if there are similar projects. I want to know this because I can be wasting my time in things that are already done.

There's Google's Guava

That's a pretty broad question. The Commons libs cover a lot of territory, but if you are using a framework such as Spring, there are even more implementations of common functionality in the scope of the framework, especially in the Spring sub-projects.