Ehcache. Ethan Nicholas's Blog: Understanding Weak References. Posted by enicholas on May 4, 2006 at 5:06 PM PDT Some time ago I was interviewing candidates for a Senior Java Engineer position.
Among the many questions I asked was "What can you tell me about weak references? " I wasn't expecting a detailed technical treatise on the subject. I would probably have been satisfied with "Umm... don't they have something to do with garbage collection? "