Hibernate Validator

https://search.maven.org/#search%7Cga%7C1%7Ca%3A%22javax.el%22
http://hibernate.org/validator/documentation/
https://docs.jboss.org/hibernate/stable/validator/reference/en-US/html_single/#_validating_constraints
https://docs.jboss.org/hibernate/validator/6.0/reference/en-US/pdf/hibernate_validator_reference.pdf
https://github.com/hibernate/hibernate-validator/blob/master/changelog.txt

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