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This framework allows to modify (correct) test values; supports validation of localized values; allows to convert values into and from text representation; formats error messages, depending on the context; supports metadata, which allows to check any entity types (not only Java Beans or POJOs) and more. Also this framework has long list of predefined validation components.
The Checker framework is an easily expansible set of check/transformation to build hierarchy of chain operations easily to-store/to-be created and re utilized (at run time if you want).