Retrieve kotlin annotations from java class

Question

I have an interface which has annotation:

@Target(AnnotationTarget.PROPERTY)
annotation class Foo()

interface Bah {
    @Foo val prop: String
}

I'm implementing a jackson contextual deserializer, and I need to pick up this annotation from the methods in the interface.

   override fun createContextual(ctxt: DeserializationContext, property: BeanProperty?): JsonDeserializer<*> {
        val clzz = ctxt.contextualType.rawClass as Class<T>
        for (method in clzz.methods) {
            val anns = method.getAnnotationsByType(Foo::class.java)

ctxt.contextualType is a JavaType. I obtain clzz from it, which yields me a class of type Bah (i.e. the interface). I can iterate the methods, which include "prop"; however, prop has no annotations.

It DOES work if I modify the annotation site to look like this:

interface Bah {
    val prop: String
        @Foo() get

However, that's ugly. How can I modify things so that I can retrieve from the interface property directly?

Thanks

well... if val prop: String @Foo() get works (so basically you added AnnotationTarget.PROPERTY_GETTER?), then you could also just use @get:Foo val prop : String ... still the same "problem"... but maybe you like that more? — Roland
– Roland, Commented Apr 12, 2019 at 12:46

yole · Accepted Answer · 2019-04-12 12:11:29Z

3

You can't. As the documentation says, annotations targeting a property are not visible from Java (because Java does not have the concept of properties).

answered Apr 12, 2019 at 12:11

yole

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1 Comment

fridgepolice Over a year ago

OK - so then what should it be?

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