androidandroid-studiogradleandroid-gradle-plugin

Android Studio Ladybug - Unknown Kotlin JVM target: 21

As the title says, I've installed new Android Studio but can't compile my project anymore. After failing in kapt I have migrated everything to ksp but still no luck. I do have following configurations from day 1:

compileOptions {
    sourceCompatibility = JavaVersion.VERSION_17
    targetCompatibility = JavaVersion.VERSION_17
}

kotlinOptions {
    jvmTarget = "17"
}

After looking everywhere and trying multiple solutions - nothing works.

I have tried this but it DOES NOT work: enter image description here

Solution

  • After digging for a solution I found this one working for me. Might be useful for you too.

    If you're using kapt:

    1. Select Gradle JDK jbr-17

    enter image description here

    1. Add following configurations to your app level build.gradle.kts
    
android{
//...
    compileOptions {
        sourceCompatibility = JavaVersion.VERSION_17
        targetCompatibility = JavaVersion.VERSION_17
    }
    kotlinOptions {
        jvmTarget = "17"
    }
    kotlin {
        jvmToolchain(17)
    }
//...
}

    I'm guessing that's because both JDKs are under the same folder AS and gradle needs to know what version of compiler/toolchain to pick. Apparently compileOptions and kotlinOptions aren't obvious enough.

    If you're using ksp

    Update to id("com.google.devtools.ksp") version "2.0.0-1.0.22" and kotlin id("org.jetbrains.kotlin.android") version "2.0.0". Should work without specifying jvmToolchain(17).

    Also make sure that: id("com.android.application") version "8.7.1"