You need validation-api.jar . It contains a Bean validation API, including bootstrap classes (javax.validation.Validation).
You may have downloaded free JAR files instead of the distribution . You can download the latest version 4.3.0 as a zip here . It contains all the files that need to be added to /WEB-INF/lib . After extracting the zip, you can find validation-api.jar in the /lib/required folder.
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