Validation Libraries
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Collection of reusable Java Validation utilies from the KIE team.
Last Release on Oct 14, 2013
AspectJ-powered way to bring @Nonnull/@Nullable validation on run-time
Last Release on Nov 10, 2015
SpringSource Org Hibernate Validator
Last Release on Jun 28, 2010

validation-core
Last Release on Oct 31, 2018
Apache Geronimo implementation of the JSR-349 Bean Validation Spec API
Last Release on Oct 6, 2016

A simple Java validation framework leveraging fluent interface style and JSR 303 specification
Last Release on Sep 12, 2017
Validation API module
Last Release on May 3, 2022
EMF Validation Framework Core
Last Release on Nov 27, 2007
Accord is a validation library written in and for Scala. Its chief aim is to provide a composable, dead-simple and self-contained story for defining validation rules and executing them on object instances. Feedback, bug reports and improvements are welcome!
Last Release on Mar 11, 2020
Contracts for Java is a contract programming framework for Java.
Last Release on Dec 13, 2013