Bean-validation Questions

I have requirement that in common api module(multi module project) i can't use any kind of hibernate's validation annotations, so i did use one

In my spring project i have a pojo class with a property for a cmyk color. i want this property to be represented by a json array with exactly 4

Im doing this project on spring boot 2.6.2. the error is that the handlemethodargumentnotvalid is not being called, because on postman when i put

I am trying to use bean validation in webflux. this is what i have so far: @postmapping("contact") fun create(@requestbody @valid