Flutter 3.27 JVM目标兼容性不一致问题求助

问题说明 #

使用Flutter 3.27构建Release版本时，出现compileReleaseJavaWithJavac(JVM目标17)与compileReleaseKotlin(JVM目标21)的兼容性冲突。已尝试以下操作但未解决：

• 升级Kotlin至2.0.20
• 切换JDK版本为17/21并配置Java Home
• 升级Gradle至8.10.2

当前配置文件 #

app/build.gradle #

plugins {
    id "com.android.application"
    id "kotlin-android"
    // The Flutter Gradle Plugin must be applied after the Android and Kotlin Gradle plugins.
    id "dev.flutter.flutter-gradle-plugin"
}

android {
    namespace = "com.example.giplapp"
    compileSdk = flutter.compileSdkVersion
    ndkVersion = "27.0.12077973"

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

    kotlinOptions {
        jvmTarget = JavaVersion.VERSION_17
    }

    kotlin  {
        jvmToolchain(17)
    }

    defaultConfig {
        // TODO: Specify your own unique Application ID (https://developer.android.com/studio/build/application-id.html).
        applicationId = "com.example.giplapp"
        // You can update the following values to match your application needs.
        // For more information, see: https://flutter.dev/to/review-gradle-config.
        minSdk = flutter.minSdkVersion
        targetSdk = flutter.targetSdkVersion
        versionCode = flutter.versionCode
        versionName = flutter.versionName
    }

    buildTypes {
        release {
            // TODO: Add your own signing config for the release build.
            // Signing with the debug keys for now, so `flutter run --release` works.
            signingConfig = signingConfigs.debug
        }
    }
}

flutter {
    source = "../.."
}

settings.gradle #

pluginManagement {
    def flutterSdkPath = {
        def properties = new Properties()
        file("local.properties").withInputStream { properties.load(it) }
        def flutterSdkPath = properties.getProperty("flutter.sdk")
        assert flutterSdkPath != null, "flutter.sdk not set in local.properties"
        return flutterSdkPath
    }()

    includeBuild("$flutterSdkPath/packages/flutter_tools/gradle")

    repositories {
        google()
        mavenCentral()
        gradlePluginPortal()
    }
}

plugins {
   id "dev.flutter.flutter-plugin-loader" version "1.0.0"
   id "com.android.application" version '8.7.3' apply false
   id "org.jetbrains.kotlin.android" version "2.0.20" apply false
}

include ":app"

可行解决步骤 #

1. 全局统一所有模块JVM配置 #

部分第三方Flutter插件可能自带独立Gradle配置，会覆盖主项目设置。在项目根目录的build.gradle中添加全局配置，强制所有模块使用JVM 17：

subprojects {
    afterEvaluate { project ->
        if (project.hasProperty('android')) {
            project.android {
                compileOptions {
                    sourceCompatibility JavaVersion.VERSION_17
                    targetCompatibility JavaVersion.VERSION_17
                }
                kotlinOptions {
                    jvmTarget = JavaVersion.VERSION_17
                }
                kotlin {
                    jvmToolchain(17)
                }
            }
        }
    }
}

2. 匹配Kotlin与Flutter版本兼容性 #

Kotlin 2.0.x与Flutter 3.27存在兼容性适配问题，尝试降级Kotlin至官方推荐的稳定版本1.9.24：
修改settings.gradle中的Kotlin版本：

id "org.jetbrains.kotlin.android" version "1.9.24" apply false

3. 明确指定JDK路径 #

在local.properties中添加JDK 17的绝对路径，避免Gradle使用系统默认JDK：

java.home=/path/to/your/jdk17

同时在IDE的项目SDK配置中，确认指向JDK 17。

4. 清理构建缓存 #

执行以下命令彻底清除旧配置残留：

flutter clean
./gradlew cleanBuildCache

之后重新构建项目。

5. 排查插件的JVM配置 #

通过命令查看所有模块的JVM目标设置，定位异常插件：

./gradlew projectProperties | grep jvmTarget

若发现某插件硬编码JVM目标为21，可替换为兼容版本，或通过全局配置强制覆盖。

内容的提问来源于stack exchange，提问作者Amritpal Singh