Hi, We released Hibernate Validator 6.0.0.Alpha2 today in coordination with the 2.0.0.Alpha2 release of Bean Validation. We improved a lot of things since the latest alpha: - improved support for container element constraints and cascading and most notably the ability to declare them using XML configuration or the programmatic API - new constraints: @NotBlank, @NotEmpty, @Email are now defined in the specification and we also added @Positive and @Negative. All these new constraints are supported in 6.0.0.Alpha2 - some performance improvements: 6 is now significantly faster than 5.4 on our benchmarks As explained in the announce on in.relation.to [1], we are looking forward to your feedback on these features. Have a nice day! [1] http://in.relation.to/2017/03/30/hibernate-validator-600-alpha2-out/