KotlinSpringBootCatModel.kt

// No need for setters getters for a simple POJO
data class Cat(var id : UUID? = null, 
               val name: String, 
               val age: Float, 
               val weight: Float, 
               var sex : Cat.Sex = Sex.Unknown) {
    enum class Sex {
        Unknown,
        Male,
        Female,
        NonBinary
    }
}