Auto Service does not work with Kotlin 2

[siddhivinayak-sk]

Auto Service annotation processor does not work with Kotlin 2 projects.

If we downgrade, Kotlin version to 1.9.x it works fine but with Kotlin 2.x it does not work.

[eamonnmcmanus]

Can you give any more information? What JDK version are you using? Are you building with Maven or Gradle or something else? When you say it doesn't work, what happens? Do you get an error message, or does it just not add the expected META-INF/services entries to the generated jar file?

[siddhivinayak-sk]

Below are required information:
JDK: 17
Build Tool: Gradle, Version: 8.12, Project configuration: Gradle with Kotlin
Kotlin version: 2.0.21

There is no any error message on console, but it does not work.
The META-INF/services entries are get created.

While further investigation using debugged, the debug pointer does not go into the processor.

It seems there is an issue while compilation of Kotlin file as Kapt is not supported Kotlin 2.x as getting below log on console:

w: Kapt currently doesn't support language version 2.0+. Falling back to 1.9.

I'm not sure yet, but seems Kotlin 2 there is compatibility issue as Kotlin announced no further upgrade in kapt, instead need to use KSP for annotation processing.

[eamonnmcmanus]

You might be able to use https://github.com/ZacSweers/auto-service-kt ?

[siddhivinayak-sk]

So far not used auto-service-kt, but I'll try to use it if works

[netdpb]

It looks like you have to opt in to using Kapt on K2. Have you tried the instructions here?