Validation Libraries
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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.
Last Release on Mar 11, 2020
EMF Validation Framework Core
Last Release on Nov 27, 2007
SpringSource Javax Validation
Last Release on Oct 13, 2009

Contracts for Java is a contract programming framework for Java.
Last Release on Dec 13, 2013
Apache Geronimo implementation of the JSR-380 Bean Validation Spec API
Last Release on Oct 19, 2020

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.
Last Release on Mar 11, 2020
gwt validation framework based on JSR-303
Last Release on May 15, 2012
stand-alone validation type
Last Release on Oct 9, 2017
Jodd VTor is focused validation framework for any Java object.
Last Release on Oct 13, 2020
Library for support of field validation
Last Release on May 30, 2017