Hi I am trying to make custom annotation for Guice in kotlin kotlinlang #announcements

Hi, I am trying to make custom annotation for Guice in kotlin codebase, it currenly doesn't recognize kotlin annotations it seems. There was a suggestion to use kapt to make it work, but I am not sure what exactly should I do with it

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Casey Brooks

11/12/2018, 8:56 PM

Guice is a runtime DI library, kapt is for compile-time annotation processing. Do you have the annotation retention set to runtime?

@Retention(AnnotationRetention.RUNTIME)
annotation class CustomGuiceAnnotation

Dias

11/12/2018, 9:02 PM

ah, I do have that set yeah

I use that annotation in primary constractor field and

@Target

is set to

FIELD

I also tried using something like

@field:CustomGuiceAnnotation

at the injection side to no avail

Casey Brooks

11/12/2018, 9:06 PM

The

@Retention

should go on the annotation class itself, right next to

@Target

, not on the constructor or a field

Dias

11/12/2018, 9:06 PM

yeah I know

that’s what I did

I just wanted to tell you where I am using the annotation

Casey Brooks

11/12/2018, 9:08 PM

Ah, got it. I am inclined to say that the annotation itself is not the issue, and that your setup with Guice is the problem. Does the same annotation work as expected if it’s in Java?

Dias

11/12/2018, 9:09 PM

I didn’t try to use in in Java, our codebase is fully kotlin

@Named

annotation works with similar setup

so I thought the problem was about custom annotation

so you think Guice should work fine with Kotlin annotations?

Casey Brooks

11/12/2018, 9:11 PM

Yeah, there should be no difference between Java and Kotlin annotations, Guice doesn’t know the difference between the two.

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