ehcache is one of the open source projects that I have contributed recently. For those who haven't heard about ehcache yet -- it is a simple, fast and thread safe cache for Java. Hibernate community uses ehcache significantly. More about ehcache at http://sourceforge.net/projects/ehcache/.
Provided a patch to support more caching policies than LRU (that it currently supports). FIFO and LFU are the new policies that I have added and submitted the patch. They can be tested only programatically at this point. I still have to add the declarative way of defining the cache policies for FIFO and LFU. Hope I can finish that soon ..

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