>> If what you're caching is large arrays, you might want to consider
breaking them up into smaller >>chunks of the same size, and pooling those. 
Not sure what you mean by pooling those. I am using JBoss cache. 

>>You might also think about tracking your cache entries via SoftReference
objects, thus letting GC >>throw them away when space gets tight.
You mean using -XX:SoftRefLRUPolicyMSPerMB=<N> ? 

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