'compileDebugJavaWithJavac' task (current target is 1.8) and 'compileDebugKotlin' task (current target is 17) jvm target compatibility should be set to the same Java version

[quoc-huynh-cosee]

I'm receiving an error if I try to build/run an android app with image_gallery_saver.

FAILURE: Build failed with an exception.

* What went wrong:
Execution failed for task ':image_gallery_saver:compileDebugKotlin'.
> 'compileDebugJavaWithJavac' task (current target is 1.8) and 'compileDebugKotlin' task (current target is 17) jvm target compatibility should be set to the same Java version.
  Consider using JVM toolchain: https://kotl.in/gradle/jvm/toolchain

* 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.
> Get more help at https://help.gradle.org.

BUILD FAILED in 1m 49s
Exception: Gradle task assembleDebug failed with exit code 1

My app/build.gradle contains these lines, which triggers the error. These lines are added by default if we are creating a new flutter project.

compileOptions {
    sourceCompatibility JavaVersion.VERSION_1_8
    targetCompatibility JavaVersion.VERSION_1_8
 }

kotlinOptions {
    jvmTarget = '1.8'
}

Other packages like package_info_plus also have these lines in the android/app/build.gradle.

[pastelcode]

Same issue here

[Collins21]

Same issue

[v1ncere]

I solve this problem of mine by deleting my android folder and run flutter create . which reverts back my build.gradle and make sure that you have a copy of your android folder if you have lots of modification on it.

this is my root level build.gradle buildscript:

buildscript {
    ext.kotlin_version = '1.9.10'
    repositories {
        google()
        mavenCentral()
    }

    dependencies {
        classpath 'com.google.gms:google-services:4.4.0'
        classpath 'com.android.tools.build:gradle:7.3.0'
        classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:$kotlin_version"
    }
}

app level build.gradle android:

android {
    namespace "com.example.example_app"
    compileSdkVersion 33
    ndkVersion flutter.ndkVersion

    compileOptions {
        sourceCompatibility JavaVersion.VERSION_1_8
        targetCompatibility JavaVersion.VERSION_1_8
    }

    kotlinOptions {
        jvmTarget = '1.8'
    }

    sourceSets {
        main.java.srcDirs += 'src/main/kotlin'
    }

    defaultConfig {
        applicationId "com.example.example_app"
        minSdkVersion 23
        targetSdkVersion 33
        versionCode flutterVersionCode.toInteger()
        versionName flutterVersionName
        multiDexEnabled true
    }

    buildTypes {
        release {
            signingConfig signingConfigs.debug
        }
    }
}

gradle-wrapper.properties: distributionUrl=https\://services.gradle.org/distributions/gradle-7.5-all.zip