Android Studio Ladybug - Unknown Kotlin JVM target: 21

[Andrea2099]

Can't compile android, return this error Unknown Kotlin JVM target: 21

Add android and compile with LadyBug Android Studio

I fixed this issue in this way.

File:
[...]\node_modules@capacitor-community\image-to-text\android\build.gradle

BEFORE

 compileOptions {
        sourceCompatibility JavaVersion.VERSION_17
        targetCompatibility JavaVersion.VERSION_17
    }

AFTER

compileOptions {
        sourceCompatibility JavaVersion.VERSION_17
        targetCompatibility JavaVersion.VERSION_17
    }
    kotlinOptions {
      jvmTarget = "17" // Deve essere coerente con JavaVersion.VERSION_17
    }

[dtarnawsky]

You'll need to set your IDE to use Java 17. Android Studio > Settings > Build, Execution, Deployment > Build Tools > Gradle and choose a Grade JDK at version 17.

Capacitor 7 will support Java 21 but Capacitor 6 and plugins are designed to run with Java 17.

[Andrea2099]

Yep

IDK in my case the build failed when the jvmTarget was not set in the kotlinOptions configuration, even though the Java version was set to 17.

    kotlinOptions {
      jvmTarget = "17" // Deve essere coerente con JavaVersion.VERSION_17
    }

[tiga05]

I accidentally stumpled across this issue. I have the same problem since I use the image-to-text capacitor plugin. But it only appears if I try to build it via capacitor CLI on my windows pc and not when using Android Studio or on my build server.

My Android Studio settings:

My error in console with capacitor CLI:

capacitor.cmd run android --target Pixel_3a_API_34_extension_level_7_x86_64
[capacitor] √ Copying web assets from browser to android\app\src\main\assets\public in 808.98ms
[capacitor] √ Creating capacitor.config.json in android\app\src\main\assets in 1.08ms
[capacitor] [info] Inlining sourcemaps
[capacitor] √ copy android in 3.31s
[capacitor] √ Updating Android plugins in 21.11ms
[capacitor] [info] Found 13 Capacitor plugins for android:
[capacitor] @byteowls/[email protected]
[capacitor] @capacitor-community/[email protected]
[capacitor] @capacitor-community/[email protected]
[capacitor] @capacitor-community/[email protected]
[capacitor] @capacitor/[email protected]
[capacitor] @capacitor/[email protected]
[capacitor] @capacitor/[email protected]
[capacitor] @capacitor/[email protected]
[capacitor] @capacitor/[email protected]
[capacitor] @capacitor/[email protected]
[capacitor] @capacitor/[email protected]
[capacitor] @capacitor/[email protected]
[capacitor] @capacitor/[email protected]
[capacitor] √ update android in 242.87ms
[capacitor] × Running Gradle build - failed!
[capacitor] [error]
[capacitor] > Configure project :app
[capacitor] WARNING: Using flatDir should be avoided because it doesn't support any meta-data formats.
[capacitor]
[capacitor] > Configure project :capacitor-cordova-android-plugins
[capacitor] WARNING: Using flatDir should be avoided because it doesn't support any meta-data formats.
[capacitor]
[capacitor] FAILURE: Build failed with an exception.
[capacitor]
[capacitor] * What went wrong:
[capacitor] Could not determine the dependencies of task ':capacitor-community-image-to-text:compileDebugKotlin'.
[capacitor] > Unknown Kotlin JVM target: 21
[capacitor]
[capacitor] * Try:
[capacitor] > Run with --stacktrace option to get the stack trace.
[capacitor] > Run with --info or --debug option to get more log output.
[capacitor] > Run with --scan to get full insights.
[capacitor] > Get more help at https://help.gradle.org.
[capacitor]
[capacitor] BUILD FAILED in 2s
[capacitor]
[ERROR] An error occurred while running subprocess capacitor.
`

So @Andrea2099 you are not alone with this error and your temporary fix worked for me, too.