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Ehcache is an open source, standards-based cache used to boost performance, offload the database and simplify scalability. Ehcache is robust, proven and full-featured and this has made it the most widely-used Java-based cache.

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Runtime Behavioral Reflection.

(also recently known as interceptors or AOP?)

This package enables a metaobject to trap method calls and field
accesses  on a regular Java object.  It provides a class
Reflection, which is a main module for implementing
runtime behavioral reflection.
It also provides
a class Loader and Compiler
as utilities for dynamically or statically
translating a regular class into a reflective class.

An instance of the reflective class is associated with
a runtime metaobject and a runtime class metaobject, which control
the behavior of that instance.
The runtime
metaobject is created for every (base-level) instance but the
runtime class metaobject is created for every (base-level) class.
Metaobject is the root class of the runtime
metaobject and ClassMetaobject is the root class
of the runtime class metaobject.

This package is provided as a sample implementation of the
reflection mechanism with Javassist.  All the programs in this package
uses only the regular Javassist API; they never call any hidden
methods.

The most significant class in this package is Reflection.
See the description of this class first.