Gradle building android project with Java 1.8 even though java gradle toolchain is set to jdk 11

Question

FAILURE: Build failed with an exception.
* Where:
Build file '/bitrise/src/app/build.gradle' line: 1
* What went wrong:
A problem occurred evaluating project ':app'.
> Failed to apply plugin 'com.android.internal.application'.
   > Android Gradle plugin requires Java 11 to run. You are currently using Java 1.8.
     You can try some of the following options:
       - changing the IDE settings.
       - changing the JAVA_HOME environment variable.
       - changing `org.gradle.java.home` in `gradle.properties`.

Gradle detects locally installed JVMs Gradle chooses a JRE/JDK matching the requirements of the build (in this case a JVM supporting Java 14) If no matching JVM is found, it will automatically download a matching JDK from AdoptOpenJDK

Does Android Gradle Plugin support the new gradle toolchains? https://docs.gradle.org/current/userguide/toolchains.html

Notable libraries / plugins / versions

• Running AGP 7.0.0-alpha03
• Kotlin 1.4.21
• Android Studio Arctic Fox Canary 3
• jvmTarget 1.8
• gradle wrapper 6.8-rc-1

App module gradle config below (some details removed)

android {

    java {
        toolchain {
            languageVersion = JavaLanguageVersion.of(11)
        }
    }

    kotlinOptions {
        jvmTarget = Versions.jdkNumber
        useIR = true
    }

    buildToolsVersion Config.buildToolsVersion
    compileSdkVersion Config.compileSdk

    buildFeatures {
        compose true
        dataBinding true
    }

    composeOptions {
        kotlinCompilerVersion Versions.kotlin_version
        kotlinCompilerExtensionVersion Versions.compose
    }

    androidExtensions {
        experimental = true
    }
}

Answer 1

You might check this out. I had a similar problem and it fixed it for me. This is Gradle's own "snippet" of code for the problem you're facing.

import org.jetbrains.kotlin.gradle.dsl.KotlinJvmCompile

plugins {
    id "org.jetbrains.kotlin.jvm" version "1.4.20"
}

repositories {
    jcenter()
}

// tag::compiler-kotlin[]
def compiler = javaToolchains.compilerFor {
    languageVersion = JavaLanguageVersion.of(11)
}

tasks.withType(KotlinJvmCompile).configureEach {
    kotlinOptions.jdkHome = compiler.get().metadata.installationPath.asFile.absolutePath
}
// end::compiler-kotlin[]

This was found at https://github.com/gradle/gradle/blob/master/subprojects/docs/src/snippets/java/toolchain-kotlin/groovy/build.gradle

I incorporated it in my project at https://github.com/7ep/r3z/blob/51cc69bb6396c34f0507b67763487c9bc171a03e/build.gradle#L36

Good luck!

Byron

Answer 2

Just solved this by adding jitpack.yml file in project root folder with content:

jdk:
  - openjdk11

• Helpful reading: https://ayoubbenkhemis.medium.com/publish-android-library-with-jitpack-be00a29a8174