This repo was created to reproduce problem with translating validation errors in Spring WebFlux.
There are custom messages for @NotNull error in both English and Polish.
The TranslateValidationWebMvcTest test checks whether the custom message is served when invalid object is sent and the locale is Polish.
This test passes, but webflux equivalent TranslateValidationWebFluxTest does not.
I assume it is because LocalValidatorFactoryBean uses LocaleContextMessageInterpolator. Hibernate Validator calls
the public String interpolate(String message, Context context) method, which relays on the LocaleContextHolder.
It uses a ThreadLocal which can't be used in WebFlux.