问题

I just updated to Android Studio Flamingo | 2022.2.1. Now I get this error:

> ' compileDebugJavaWithJavac ' task (current target is 1.8) and ' kaptGenerateStubsDebugKotlin ' 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

I am using the AS included Kotlin which is 1.8.0 but this was working fine with AGP 7.4.2 and Gradle 7.5 - it only broke with the Gradle and AGP update coming from AS Flamingo. Also:

• if I downgrade Kotlin to 1.7.20 it works again
• if I update Kotlin to 1.8.20 it gives the error above

I do have the compile options:

        sourceCompatibility JavaVersion.VERSION_1_8
        targetCompatibility JavaVersion.VERSION_1_8
    }
    kotlinOptions {
        jvmTarget = '1.8'
    }

I tried also the sample AS apps but they have Kotlin 1.7.20. They will work with Kotlin 1.8.0 too - unless you introduce kapt in dependencies! (e.g. Dagger)

So what is the combination that should work - including kapt - and has the latest stable recommended versions from Android Studio?

• Android Studio version?
• AGP version?
• Gradle version?
• Kotlin version?

Please no untested answers. I know it "should" work but it doesn't.

Execution failed for task ':app:kaptGenerateStubsDebugKotlin'.
> 'compileDebugJavaWithJavac' task (current target is 1.8) and 'kaptGenerateStubsDebugKotlin' 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

    compileOptions {
        sourceCompatibility JavaVersion.VERSION_1_8
        targetCompatibility JavaVersion.VERSION_1_8
    }
    kotlinOptions {
        jvmTarget = '1.8'
    }

答案1

得分: 12

最新的Android Gradle插件与Kotlin kapt之间存在兼容性问题。因此，在Android配置中指定的jvmTarget将设置在Kotlin编译任务上，但不会设置在kapt任务上，kapt任务默认使用工具链版本（目前为JDK 17）。

作为解决方法，在kapt任务上手动设置jvmTarget（在您的情况下，目标是Java 1.8）：

tasks.withType(org.jetbrains.kotlin.gradle.tasks.KaptGenerateStubs).configureEach {
    kotlinOptions {
        jvmTarget = "1.8"
    }
}

tasks.withType(org.jetbrains.kotlin.gradle.tasks.KaptGenerateStubs).configureEach {
    kotlinOptions {
        jvmTarget = "1.8"
    }
}

答案2

得分: 6

I think use the jvmToolchain as the error info saying would solve this problem:

考虑使用 JVM 工具链：https://kotl.in/gradle/jvm/toolchain

With the following version and config my project works well.

• Android Studio Flamingo 2022.2.1
• AGP version 8.0.0
• Gradle version 8.0
• Kotlin version 1.8.0

build.gradle 中的配置:

kotlin {
    jvmToolchain(8)
}

android {
    compileOptions {
        sourceCompatibility JavaVersion.VERSION_1_8
        targetCompatibility JavaVersion.VERSION_1_8
    }

    kotlinOptions {
        jvmTarget = '1.8'
    }
}

如果想了解更多详情，可以查看以下两个链接中的相关官方文档和解释：

https://kotlinlang.org/docs/gradle-configure-project.html#gradle-java-toolchains-support

无法设置 kapt 的 JVM 目标版本：

https://youtrack.jetbrains.com/issue/KT-55947

<details>
<summary>英文:</summary>

I think use the jvmToolchain as the error info saying would solve this problem:

Consider using JVM toolchain: https://kotl.in/gradle/jvm/toolchain


With the following version and config my project works well.

 - Android Studio Flamingo 2022.2.1
 - AGP version 8.0.0
 - Gradle version 8.0
 - Kotlin version 1.8.0

config in build.gradle:


    kotlin {
        jvmToolchain(8)
    }


    android {
    
        compileOptions {
            sourceCompatibility JavaVersion.VERSION_1_8
            targetCompatibility JavaVersion.VERSION_1_8
        }
    
        kotlinOptions {
            jvmTarget = &#39;1.8&#39;
        }
    }


If want to know more details, you can see the related official doc and explanation in below two links:

https://kotlinlang.org/docs/gradle-configure-project.html#gradle-java-toolchains-support


Unable to set kapt jvm target version:

https://youtrack.jetbrains.com/issue/KT-55947


</details>



# 答案3
**得分**: 2

以下是翻译好的部分：

我在我的项目中使用以下版本，该项目可以顺利构建：
- Android Studio Flamingo `2022.2.1`
- `AGP` 版本 `8.0.0`
- `Gradle` 版本 `8.0`
- `Kotlin` 版本 `1.8.0`

要消除错误，请将您的代码更改为以下内容：

```groovy
android {
    ...
    compileOptions {
        sourceCompatibilityJavaVersion.VERSION_17
        targetCompatibilityJavaVersion.VERSION_17
    }
    kotlinOptions {
        jvmTarget = '17'
    }
    ...
}

在此您可以查看与项目中应使用的JDK版本相关的Gradle 8.0.0兼容性表格。

更新:

如果您不想更改您的Java版本并且在项目中使用Groovy DSL，那么@BladeCoder的回答是最佳解决方案。

然而，如果您使用的是Kotlin DSL，那么此解决方案的语法将略有不同：

tasks.withType<org.jetbrains.kotlin.gradle.tasks.KaptGenerateStubs> {
    kotlinOptions {
        jvmTarget="1.8"
    }
}

android {
...
compileOptions {
sourceCompatibilityJavaVersion.VERSION_17
targetCompatibilityJavaVersion.VERSION_17
}
kotlinOptions {
jvmTarget = '17'
}
...
}

tasks.withType<org.jetbrains.kotlin.gradle.tasks.KaptGenerateStubs> {
kotlinOptions {
jvmTarget="1.8"
}
}

答案4

得分: 1

这对我完全有效 ╰( ͡° ͜ʖ ͡° )つ──☆*:・ﾟ

项目的 build.gradle 文件：

allprojects {
    tasks.withType(org.jetbrains.kotlin.gradle.tasks.AbstractKotlinCompile).configureEach {
        kotlinOptions {
            jvmTarget = "1.8"
            apiVersion = "1.8"
            languageVersion = "1.8"
        }
    }
}

allprojects {    tasks.withType(org.jetbrains.kotlin.gradle.tasks.AbstractKotlinCompile).configureEach {
kotlinOptions {
jvmTarget = "1.8"
apiVersion = "1.8"
languageVersion = "1.8"
}
}
}