Validation is yet another facility that appeared as an ad hoc extension in Resteasy 2 and was later formalized in JAX-RS 2.0. In Resteasy 2, validation was implemented in the resteasy-hibernatevalidator-provider module, and it was necessary to annotate classes and/or methods with @ValidateRequest to enable validation.

In Resteasy, validation is implemented in the resteasy-validator-provider-11 module, and @ValidateRequest is no longer relevant. In fact, validation is enabled by default, as long as resteasy-validator-provider-11 is on the classpath.