How to upgrade an Android project to Java 11

Question

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

Answer 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 

Answer 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.