OVal is an extensible object validation framework for Java 5 or later. Annotations (@NotNull) or XML configuration files can be used to express class constraints. OVal can optionally use AspectJ to enforce automatic validation (programming by contract).
They have a firm grasp on what developers want and how simple a common problem can be solved.
It's a great project with a very helpful project owner.
Oval is a great solution to validate domain objects. Even more, I'm surprised about how easily this framework can be extended and adapted.
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