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, Ove

Edit #1: This is a sample made some time ago by Dan Lew

https://github.com/dlew/android-architecture-counter-sample

build.gradle:

apply plugin: 'com.android.application'
apply plugin: 'kotlin-android'
apply plugin: 'kotlin-kapt'

android {
    compileSdkVersion 25
    buildToolsVersion rootProject.ext.buildToolsVersion
    defaultConfig {
        applicationId "net.danlew.counter"
        minSdkVersion 23
        targetSdkVersion 25
        versionCode 1
        versionName "1.0"
        testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"
    }
    buildTypes {
        release {
            minifyEnabled false
            proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
        }
    }
}

dependencies {
    compile fileTree(dir: 'libs', include: ['*.jar'])
    androidTestCompile('com.android.support.test.espresso:espresso-core:2.2.2', {
        exclude group: 'com.android.support', module: 'support-annotations'
    })
    compile "com.android.support:appcompat-v7:${rootProject.ext.supportLibVersion}"
    compile "com.android.support:recyclerview-v7:${rootProject.ext.supportLibVersion}"
    compile "com.android.support:design:${rootProject.ext.supportLibVersion}"
    compile "com.android.support:cardview-v7:${rootProject.ext.supportLibVersion}"
    compile 'com.android.support.constraint:constraint-layout:1.0.2'
    testCompile 'junit:junit:4.12'

    compile "android.arch.lifecycle:extensions:${rootProject.archLifecycleVersion}"
    compile "android.arch.persistence.room:runtime:${rootProject.archRoomVersion}"
    compile "android.arch.persistence.room:rxjava2:${rootProject.archRoomVersion}"
    kapt "android.arch.lifecycle:compiler:${rootProject.archLifecycleVersion}"
    kapt "android.arch.persistence.room:compiler:${rootProject.archRoomVersion}"
    compile "org.jetbrains.kotlin:kotlin-stdlib-jre7:$kotlin_version"

    String butterKnifeVersion = '8.5.1'
    compile "com.jakewharton:butterknife:$butterKnifeVersion"
    kapt "com.jakewharton:butterknife-compiler:$butterKnifeVersion"

    compile 'io.reactivex.rxjava2:rxjava:2.1.0'

    String daggerVersion = '2.10'
    compile "com.google.dagger:dagger:$daggerVersion"
    kapt "com.google.dagger:dagger-compiler:$daggerVersion"

    String rxBindingVersion = '2.0.0'
    compile "com.jakewharton.rxbinding2:rxbinding:$rxBindingVersion"
    compile "com.jakewharton.rxbinding2:rxbinding-kotlin:$rxBindingVersion"

    compile 'com.jakewharton.timber:timber:4.5.1'

    compile 'com.jakewharton.rxrelay2:rxrelay:2.0.0'
}

repositories {
    mavenCentral()
}

have you tried to set the Kotlin `Target JVM version` in the Kotlin settings panel to 1.8? — MatPag, Jul 05 '17 at 12:49
Setting the `Target JVM version` in the Kotlin settings has no effect on this warning. — Neal Sanche, Jul 17 '17 at 15:56
Haven't gotten down to try again... Which release are you using? Canary 7? — Ove Stoerholt, Jul 27 '17 at 20:35

score 29 · Accepted Answer · answered Nov 06 '17 at 22:09

29

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"

answered Nov 06 '17 at 22:09

Mark

3,334
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@rekire Which string do you use for room? – sandrstar Jan 17 '18 at 13:15
1

For Room use `implementation 'android.arch.persistence.room:runtime:1.0.0'`. [Link](https://developer.android.com/topic/libraries/architecture/adding-components.html) – Yann39 Feb 18 '18 at 15:55
`android.arch.lifecycle:common:1.0.0` is a bit annoying as `support:appcompat-v7` has a dependency on it, meaning it's brought in anyway. – Mark May 02 '18 at 22:01

score 19 · Answer 2 · answered Oct 20 '17 at 07:53

Just adding this answer for future reference: the same issue was also raised with the Android Arch Components team a while ago and the official answer for now is:

(...) it is just a warning. Should not be a problem.

This applies to warnings following the format mentioned in the title of the question, and include:

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

w: warning: Supported source version 'RELEASE_7' from annotation processor 'android.arch.persistence.room.RoomProcessor' less than -source '1.8' w:

Basically it's javac informing you that these annotation processors were compiled against and generate code for a different (older) version of Java (Java 7) than your module's source level is set to (Java 8). The reason for this is that the compiler cannot make any promises that the processors will then still behave correctly [but the developers can and did in this particular case].

Note that the warning is still issued if you remove the -Xlint compiler flag, so short of using -nowarn it cannot be suppressed unfortunately.

@CoolMind: That issue was already linked to in the first sentence of this answer (see: "official answer"). ;) — MH., Dec 13 '17 at 14:56

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

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