My kingdom for a cache

I'm looking for a Java class or Java library that will help me
implement a client-side cache for data fetched from the server. I'm
thinking of a Map-like structure the contents of which are evicted on
a least-recently-used basis, or after some predefined duration.

Since it will be embedded in a GWT app (in the client), it doesn't
have to be thread-safe. Yay! The rub is, of course, that it needs to
use only those Java classes supported by GWT's JRE Emulation.

Any ideas?

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