How to upgrade an Android project to Java 11

I am using the latest Android Studio Arctic Fox 2020.03.01 Canary 8 and AGP 7, and I want to convert my project to use Java 11. Apparently just doing the following does not work as mentioned on https://developer.android.com/studio/preview/features#use-java-11:

android {
    compileSdkVersion 30

    compileOptions {
      sourceCompatibility JavaVersion.VERSION_11
      targetCompatibility JavaVersion.VERSION_11
    }

    // For Kotlin projects
    kotlinOptions {
      jvmTarget = "11"
    }
}

I get the following error when I build:

Execution failed for task ':app:compileDebugJavaWithJavac'.
> Could not resolve all files for configuration ':app:androidJdkImage'.
   > Failed to transform core-for-system-modules.jar to match attributes {artifactType=_internal_android_jdk_image, org.gradle.libraryelements=jar, org.gradle.usage=java-runtime}.
      > Execution failed for JdkImageTransform: /Users/azfarsiddiqui/Library/Android/sdk/platforms/android-30/core-for-system-modules.jar.
         > jlink executable /Applications/Android Studio Preview.app/Contents/jre/jdk/Contents/Home/bin/jlink does not exist.

* Try:
Run with --stacktrace option to get the stack trace. Run with --info or --debug option to get more log output. Run with --scan to get full insights.

To keep it simple, I've been trying this on a Jetpack Compose sample project here: https://github.com/android/compose-samples/tree/main/JetNews

Any thoughts? Thanks guys

Solution 1:

From Android Studio Artic Fox 2020.3.1

Preferences (Settings) -> Build, Execution, Deployment -> Build Tools -> Gradle -> Gradle JDK -> Select JDK 11 or download JDK

Before Artic Fox 2020.3.1 Version

I assume you have Java 11 or later installed. Following steps:

File -> Project Structure -> SDK Location -> Change JDK Location to the Java 11 jdk folder

If you are using Mac OS then try to search for that folder in:

/Library/Java/JavaVirtualMachines/jdk-11.0.9.jdk/Contents/Home

Solution 2:

Install OpenJDK 11. With brew it looks like this:

brew tap AdoptOpenJDK/openjdk
brew install adoptopenjdk11

In Android Studio: File -> Project Structure -> SDK Location, set the JDK location

You can find the JDK location with the command

/usr/libexec/java_home -v 11

It is /Library/Java/JavaVirtualMachines/adoptopenjdk-11.jdk/Contents/Home for me.

Solution 3:

I had openjdk11 installed but jlink did actually not exist.

Reinstalling openjdk11 fixed this.

• sudo apt autoremove openjdk-11-jdk-headless
• sudo apt install openjdk-11-jdk-headless

Solution 4:

If you want remove the "Target JRE version does not match project SDK" warning, you need to change the ProjectRootManager settings in $PROJECT_DIR$/.idea/misc.xml.

From

<component name="ProjectRootManager" version="2" languageLevel="JDK_1_8" default="true" project-jdk-name="1.8" project-jdk-type="JavaSDK">

to

<component name="ProjectRootManager" version="2" languageLevel="JDK_11" project-jdk-name="11" project-jdk-type="JavaSDK" />