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

by

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"

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