kotlinkotlin-interop

Kotlin: how to pass array to Java annotation

I want to use @OneOf annotation from package io.dropwizard.validation;

Java usage: 

@OneOf(value = {"m", "f"})

Kotlin usage: ???

I've tried this: 

 @OneOf(value = arrayOf("m", "f"))

and this:

 @OneOf(value = ["m", "f"])

(EDIT: this example works since Kotlin 1.2, it supports array literal in annotation, thanks @BakaWaii)

All i get is :

Type inference failed. Expected type mismatch:

required: String

found: Array<String>

Kotlin version: 1.1.2-2

Solution

  • The value parameter is automatically converted to a vararg parameter in Kotlin, as described in http://kotlinlang.org/docs/reference/annotations.html#java-annotations.

    The correct syntax for this particular case is @OneOf("m", "f")