valid4j is a simple assertion and validation library for Java which makes it possible to use your favorite hamcrest-matchers to express pre- and post-conditions in your code in a design by contract style.
http://www.valid4j.org/
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http://www.valid4j.org/
#interfacesmieci
A fluent API for enforcing design contracts with automatic message generation.
https://bitbucket.org/cowwoc/requirements.java/wiki/Home
#interfacesmieci