Stormpot is an object pooling library for Java. Use it to recycle objects that are expensive to create. The library will take care of creating and destroying your objects in the background.
... over, say, Commons-Pool? Good question! Both libraries are released under the Apache 2.0 license, both have thorough documentation, both have high test coverage (Stormpot have 100%) and both depend on nothing but Java itself.
There are differences, though. Stormpot has a small invasive API, whereas Commons-Pool has a richer and less intrusive API. The different slants in their API design comes from differing focus. Stormpot is designed for performance and a unified API for different implementations. This means that those who use Stormpot can switch between implementations without worrying about compatibility. Commons-Pool, on the other hand, have different APIs for two different kinds of pools, so changing pool implementation might mean also having to change the code that uses the pool. On the other hand, the various pool implementations can make special features available that would otherwise be inconvenient to expose through a generic API.
Stormpot is licensed under the Apache 2.0 software license: http://www.apache.org/licenses/LICENSE-2.0.html
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