How to fix the following Unity Build Error (Android build, Unity 6000.1.14f): "Jetifier failed to transform .. fastdoubleparser-2.0.1.jar"

Question

I am using Unity 6000.1.14f with a custom .aar plugin for a Standalone VR-App. The plugin uses AGP 8.7.3 and Gradle 8.12.1.

Complete Error message is:

Execution failed for task ':launcher:mergeDebugJavaResource'.
> Could not resolve all files for configuration ':launcher:debugRuntimeClasspath'.
   > Failed to transform fastdoubleparser-2.0.1.jar (ch.randelshofer:fastdoubleparser:2.0.1) to match attributes {artifactType=android-java-res, org.gradle.category=library, org.gradle.libraryelements=jar, org.gradle.status=release, org.gradle.usage=java-runtime}.
> Execution failed for JetifyTransform: C:\Users\user\.gradle\caches\modules-2\files-2.1\ch.randelshofer\fastdoubleparser\2.0.1\ccf4a1c0441e7af5cf24c7b3a9766b2e2646bdea\fastdoubleparser-2.0.1.jar.
> Jetifier failed to transform: C:\Users\user\.gradle\caches\modules-2\files-2.1\ch.randelshofer\fastdoubleparser\2.0.1\ccf4a1c0441e7af5cf24c7b3a9766b2e2646bdea\fastdoubleparser-2.0.1.jar

The error was: java.lang.IllegalArgumentException - Unsupported class file major version 67 
To fix this issue, see https://issuetracker.google.com/issues/184622491

I first tried to follow the instructions at the issuetracker, but they did not work:

I added the android.enableJetifier=false line to the custom gradle.properties file in Unity (gradleTemplate.properties).
Then I removed that line and added the line android.jetifier.ignorelist = "fastdoubleparser-2.0.1.jar"

The error persists on a clean build and after deleting the username/.gradle folder on disc (I use windwows 11). I also tried a google search, but that did not yield any other results.

For reference here is the setup of my .aar plugin and my dependencies in Unity.

AAR Setup:

The .aar is build build with gradle 8.12.1. My build.gradle.kts:

plugins {
    id("com.android.library")
    alias(libs.plugins.kotlin.android)
    id("org.jetbrains.kotlinx.dataframe")
    id("com.google.devtools.ksp")
}

// For correct initialisation order
apply(plugin = "org.jetbrains.kotlin.android")
apply(plugin = "com.android.library")
apply(plugin = "org.jetbrains.kotlinx.dataframe")
apply(plugin = "com.google.devtools.ksp")

androidComponents {
    beforeVariants { variant -\>
       variant.androidTest.enable = false
    }
}

android {
    namespace = "com.n8.polar_unity_bridge"
    compileSdk = 36
    defaultConfig {
        minSdk = 29
    }
    testBuildType = "debug"
    buildTypes {
        release {
            isMinifyEnabled = false
            proguardFiles(
                getDefaultProguardFile("proguard-android-optimize.txt"),
                "proguard-rules.pro"
            )
        }
        getByName("debug") {
        isJniDebuggable = true
        }
    }
    compileOptions {
        sourceCompatibility = JavaVersion.VERSION_17
        targetCompatibility = JavaVersion.VERSION_17
    }
    kotlinOptions {
        jvmTarget = "17"
    }

// Stuff from here for the dataframe plugin https://kotlin.github.io/dataframe/setupandroid.html#kotlin-dataframe-compiler-plugin
    packaging {
        resources {
            pickFirsts += listOf(
                "META-INF/AL2.0",
                "META-INF/LGPL2.1",
                "META-INF/ASL-2.0.txt",
                "META-INF/LICENSE.md",
                "META-INF/NOTICE.md",
                "META-INF/LGPL-3.0.txt",
                "META-INF/thirdparty-LICENSE",
                "org/jetbrains/kotlinx/dataframe/documentation/**",
            )
            excludes += listOf(
                "META-INF/kotlin-jupyter-libraries/libraries.json",
                "META-INF/{INDEX.LIST,DEPENDENCIES}",
                "{draftv3,draftv4}/schema",
                "arrow-git.properties",
                "org/jetbrains/kotlinx/dataframe/documentation/**",
                "META-INF/*.kotlin_module",
                "META-INF/*",
                "META-INF/versions/9/module-info.class",
                "META-INF/versions/9/**",
            )
        }
    }
}

dependencies {
    implementation("com.google.dagger:dagger-compiler:2.57.1")
    ksp("com.google.dagger:dagger-compiler:2.57.1")
    compileOnly(files("libs/unity.jar"))
    implementation(libs.polar.ble.sdk)
    implementation(libs.kotlin.stdlib)
    implementation(libs.dataframe.csv)
    implementation(libs.kotlinx.serialization.json)
    implementation(libs.rxjava)
    implementation(libs.rxandroid)
    implementation(libs.androidx.runtime)
    implementation(libs.androidx.core.ktx)
}

The aar also uses this libs.versions.toml:


\[versions\]
agp = "8.7.3"
dataframe = "0.15.0"
kotlin = "2.2.0"
stdlib = "2.2.0"
coreKtx = "1.16.0"
kotlinxSerializationJson = "1.9.0"
polarBleSdk = "6.5.0"
rxandroid = "3.0.2"
rxjava = "3.1.11"
runtime = "1.8.0"

\[libraries\]
androidx-core-ktx = { group = "androidx.core", name = "core-ktx", version.ref = "coreKtx" }
dataframe-csv = { module = "org.jetbrains.kotlinx:dataframe-csv", version.ref = "dataframe" }
kotlin-stdlib = { module = "org.jetbrains.kotlin:kotlin-stdlib", version.ref = "stdlib" }
kotlinx-serialization-json = { module = "org.jetbrains.kotlinx:kotlinx-serialization-json", version.ref = "kotlinxSerializationJson" }
polar-ble-sdk = { module = "com.github.polarofficial:polar-ble-sdk", version.ref = "polarBleSdk" }
rxandroid = { module = "io.reactivex.rxjava3:rxandroid", version.ref = "rxandroid" }
rxjava = { module = "io.reactivex.rxjava3:rxjava", version.ref = "rxjava" }
androidx-runtime = { group = "androidx.compose.runtime", name = "runtime", version.ref = "runtime" }

\[plugins\]
kotlin-android = { id = "org.jetbrains.kotlin.android", version.ref = "kotlin" }
android-library = { id = "com.android.library", version.ref = "agp" }

For Unity I use the Unity-Jar-Resolver, with this Editor/Dependencies.xml:

<dependencies>
    <androidPackages>
        <repositories>
            <repository>https://repo.maven.apache.org/maven2</repository>
            <repository>https://dl.google.com/dl/android/maven2/</repository>
            <repository>https://plugins.gradle.org/m2/</repository>
            <repository>https://jitpack.io</repository>
        </repositories>
        <!-- Polar BLE SDK -->
        <androidPackage spec="com.github.polarofficial:polar-ble-sdk:6.5.0" />
        <!-- "repositories" are optional and contain the set of additional
             repository URIs to search for this package. -->
        <repositories>
            <repository>https://jitpack.io</repository>
        </repositories>
        
        <!-- RxJava -->
        <androidPackage spec="io.reactivex.rxjava3:rxjava:3.1.11" />
        <!-- RxAndroid -->
        <androidPackage spec="io.reactivex.rxjava3:rxandroid:3.0.2" />
        
        <!-- AndroidX Core KTX -->
        <androidPackage spec="androidx.core:core-ktx:1.16.0" />
        <!-- AndroidX Compose Runtime -->
        <androidPackage spec="androidx.compose.runtime:runtime:1.8.0" />
        
        <!-- Kotlin Android 
        <androidPackage spec="org.jetbrains.kotlin.android:android:2.2.0" /> -->
        <!-- Kotlin Standard Library -->
        <androidPackage spec="org.jetbrains.kotlin:kotlin-stdlib:2.2.0" />
        <!-- Kotlinx Serialization JSON -->
        <androidPackage spec="org.jetbrains.kotlinx:kotlinx-serialization-json:1.9.0" />
        <!-- Kotlin DataFrame CSV -->
        <androidPackage spec="org.jetbrains.kotlinx:dataframe-csv:0.15.0" />
    </androidPackages>
</dependencies>

Martin Zeitler · Accepted Answer · 2025-09-07 12:23:34Z

1

It doesn't know about JDK 23 classes:

Unsupported class file major version 67

You'd need to use fastdoubleparser-java17 instead of fastdoubleparser-java23.

https://github.com/wrandelshofer/FastDoubleParser

answered Sep 7 at 12:23

Martin Zeitler

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2 Comments

N8W1nD Sep 7 at 15:46

Thanks a lot! Could you point me to a solution how to do make android studio/gradle do that? So far I tried to add this snippet to my build.gradle.kts:

configurations.all {       resolutionStrategy.eachDependency {          if (requested.group == "ch.randelshofer" && requested.name == "fastdoubleparser") {              useTarget("ch.randelshofer:fastdoubleparser-java17:2.0.1")          }      }  }

But it does not find this repo on mavenCentral (obviously in hindsight :D). I also did not find a solution to force the java 17 release. I am really out of my depth, and appreciate all help!

Martin Zeitler Sep 7 at 17:36

You probably should read the README.

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