{{some.property}}

required = false

@RequestParam

@RequestParam code: Optional<String>

@RequestParam code: String?

spring-kotlin

spring-kotin

Bean property 'rating' is not readable or has an invalid getter method: Does the return type of the getter match the parameter type of the setter?

getRating / setRating

class Config() {
    var rating = ""
        get set

    constructor(rating: String): this() {
        this.rating = rating
    }
}

class Config(var rating:String)