Inconsistent JVM-target compatibility detected for tasks despite already defining jvm ver

Question

I'm running a flutter project and recently updated a bunch of dependencies. I'm getting this error:

* What went wrong:
Execution failed for task ':flutter_google_places_sdk_android:compileDebugKotlin'.
> Inconsistent JVM-target compatibility detected for tasks 'compileDebugJavaWithJavac' (1.8) and 'compileDebugKotlin' (17).

  Consider using JVM Toolchain: https://kotl.in/gradle/jvm/toolchain
  Learn more about JVM-target validation: https://kotl.in/gradle/jvm/target-validation 

I've already updated by build.gradle file to include the following, having already seen these questions

• How to set compileJava' task ( 11) and 'compileKotlin' task (1.8) jvm target compatibility to the same Java version in build.gradle.kts?

• Upgrading Android Gradle Plugin to 8.0.0 "jvm target compatibility should be set to the same Java version"

    compileOptions {
        sourceCompatibility JavaVersion.VERSION_17
        targetCompatibility JavaVersion.VERSION_17
    }

    kotlinOptions {
        jvmTarget = JavaVersion.VERSION_17
    }

    kotlin {
        jvmToolchain(17)
    }

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

However, I still get the above error. Here's my flutter doctor:

[✓] Flutter (Channel stable, 3.13.6, on macOS 13.2.1 22D68 darwin-x64, locale en-AU)
    • Flutter version 3.13.6 on channel stable at /Users/sophiahuynh/Documents/_gitLabProjects/flutter
    • Upstream repository https://github.com/flutter/flutter.git
    • Framework revision ead455963c (8 weeks ago), 2023-09-26 18:28:17 -0700
    • Engine revision a794cf2681
    • Dart version 3.1.3
    • DevTools version 2.25.0

[✓] Android toolchain - develop for Android devices (Android SDK version 34.0.0)
    • Android SDK at /Users/sophiahuynh/Library/Android/sdk
    • Platform android-34, build-tools 34.0.0
    • Java binary at: /Users/sophiahuynh/Library/Java/JavaVirtualMachines/jbrsdk-17.0.9/Contents/Home/bin/java
    • Java version OpenJDK Runtime Environment JBR-17.0.9+7-1087.3-nomod (build 17.0.9+7-b1087.3)
    • All Android licenses accepted.

[✓] Xcode - develop for iOS and macOS (Xcode 14.3.1)
    • Xcode at /Applications/Xcode.app/Contents/Developer
    • Build 14E300c
    • CocoaPods version 1.13.0

[✓] Chrome - develop for the web
    • Chrome at /Applications/Google Chrome.app/Contents/MacOS/Google Chrome

[✓] Android Studio (version 2022.3)
    • Android Studio at /Applications/Android Studio.app/Contents
    • Flutter plugin can be installed from:
      🔨 https://plugins.jetbrains.com/plugin/9212-flutter
    • Dart plugin can be installed from:
      🔨 https://plugins.jetbrains.com/plugin/6351-dart
    • Java version OpenJDK Runtime Environment (build 17.0.6+0-17.0.6b829.9-10027231)

[✓] VS Code (version 1.84.2)
    • VS Code at /Applications/Visual Studio Code.app/Contents
    • Flutter extension version 3.76.0

[✓] Connected device (3 available)
    • Android SDK built for x86 (mobile) • emulator-5554 • android-x86    • Android 8.1.0 (API 27) (emulator)
    • macOS (desktop)                    • macos         • darwin-x64     • macOS 13.2.1 22D68 darwin-x64
    • Chrome (web)                       • chrome        • web-javascript • Google Chrome 119.0.6045.159

[✓] Network resources
    • All expected network resources are available.

• I'm running Java 17.0.9 (incl. my java home, android studio gradle jdk)
• I'm running Gradle 8.4 (was running 8.0 before and still facing the same issue)
• Kotlin 1.9.20 (also faced the same issue when I was on 1.8.0)

I'm quite lost at what else I can try to do. Any help is appreciated. Thanks!!

Joyann

How to solve this issue? – Synopsis

Might be this can help! Please check, – Synopsis

Answer 1

I was facing same error when upgrading Gradle 8.2 and Kotlin 1.9.22.

1. Make sure you have the same version here:

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

   kotlinOptions { jvmTarget = "17" }

2. Add in your gralde.properties: kotlin.jvm.target.validation.mode = IGNORE

This solution maybe doesn't solve the issue but can bypass it until someone fix it.

Only with step 1 didn't worked.

Hope it helps.

Puisne

Why do I need to ignore this? – Pickwickian

@JesséLopesPereira Because Flutter is years behind in their gradle config. They've dropped the ball there – Humanoid

is there an update for this solution? – Horgan

are you sure of that? Did not work for me at least, Execution failed for task ':disk_space_plus:compileReleaseKotlin'. Inconsistent JVM-target compatibility detected for tasks 'compileReleaseJavaWithJavac' (1.8) and 'compileReleaseKotlin' (17). – Joey

Answer 2

A warning for Android users. To use Gradle toolchain support, use the Android Gradle plugin (AGP) version 8.1.0-alpha09 or higher.

This worked for me:

android {
    compileSdk 34

    compileOptions {
        sourceCompatibility = 17
        targetCompatibility = 17
    }

Continuant

That worked well for me! Thanks! – Nullity

Answer 3

For me the issue was solved by adding this to the general build.gradle.kts.

   allprojects {
      tasks.withType(org.jetbrains.kotlin.gradle.tasks.KotlinCompile::class.java).configureEach {
         kotlinOptions {
             jvmTarget = "17"
         }
      }
    ...
}

Preciousprecipice

I get error: "No such property: java for class: org.jetbrains.kotlin.gradle.tasks.KotlinCompile" – Hornblende