Ehcache is a pure Java, in-process cache with the following features:
  1. Fast
  2. Simple
  3. Acts as a pluggable cache for Hibernate 2.1, 3 and 3.1.
  4. Small foot print. Both in terms of size and memory requirements.
  5. Minimal dependencies.
  6. Fully documented. See the online Documentation, FAQ and the
     online JavaDoc.
  7. Provides Memory and Disk stores.
  8. Comprehensively Test Coverage. See the clover test report.
  9. Scalable to hundreds of caches and large multi-cpu servers.
 10. Multiple CacheManagers per virtual machine (new in 1.2)
 11. Provides LRU, LFU and FIFO cache eviction policies. (new in 1.2)
 12. Persistent disk store which stores data between VM restarts.
 13. Supports the registration of CacheManager and CacheEventListener
     for flexible integration(new in 1.2)
 14. Distributed caching, with fine grained control overf discovery
     and delivery options.
 15. Pluggable distribution API  for extending distribution with
     different mechanisms.
 16. Available under the Apache 1.1license. Ehcache's copyright and
     licensing has been reviewed and approved by the Apache Software
     Foundation, making ehcache suitable for use in Apache projects.
 17. Production tested. All final versions of ehcache are production
     tested for several weeks on a large and very busy eCommerce site
     before release.
 18. BlockingCache, SelfPopulatingCache, gzipping, caching Servlet
     filters, and AsynchronousFaultTolerantCommandExecutor available
     in the optional ehcache-constructs package.

• Igor Vlasenko

• ehcache