Warning: warning: Supported source version 'RELEASE_7' from annotation processor 'android.arch.lifecycle.LifecycleProcessor' less than -source '1.8'

Question

Trying to build a sample using Android Studio 3 Canary 5 with Architecture Components and Kotlin gives this warning.

Can anyone tell me the reason?

Thanks, O

Answer 1

There is a Java 8 annotation processor now arch components are stable so replace:

"android.arch.lifecycle:compiler:${rootProject.archLifecycleVersion}"

with

"android.arch.lifecycle:common-java8:1.0.0"