Spring Boot: integrating Bean Validation between Spring and Hibernate (supporting DI on custom validations with Hibernate)

BeanValidationConfig.java

@Configuration
public class BeanValidationConfig {

    /**
     * The idea here is to configure Hibernate to use the same ValidatorFactory used by Spring,  
     * so that Hibernate will be able to handle custom validations that need to use dependency injection (DI)
     */
    @Bean
    public HibernatePropertiesCustomizer hibernatePropertiesCustomizer(final Validator validator) {
        return new HibernatePropertiesCustomizer() {
            @Override
            public void customize(Map<String, Object> hibernateProperties) {
                hibernateProperties.put("javax.persistence.validation.factory", validator);
            }
        }; // or replace with lambda: return hibernateProperties -> hibernateProperties.put("javax.persistence.validation.factory", validator);
    }
}

Here is a very good explanation about why Bean Validation with Hibernate does not support dependency injection (DI) by default: Video Dev Eficiente: Como funciona a integração entre o Spring e a Bean Validation