前言

在做的一个Kotlin项目用到的数据库框架是greenDAO，在将项目升级到AGP 8.0版本后，编译时由于greenDAO版本不兼容导致编译不过，经过一番摸索，最终解决了greenDAO在AGP 8.0+版本下的编译报错问题，特此记录一下😄

环境

升级greenDAO插件版本到3.3.1

修改项目根目录下的build.gradle文件，内容如下：

buildscript {
    repositories {
        google()
        mavenCentral()
    }
    dependencies {
        classpath 'com.android.tools.build:gradle:8.0.2'
        classpath 'org.greenrobot:greendao-gradle-plugin:3.3.1'
    }
}

升级greenDAO依赖版本到3.3.0

修改项目模块如app模块下的build.gradle文件，内容如下：

plugins {
    id 'com.android.application'
    id 'kotlin-android'
    id 'kotlin-android-extensions'
    id 'kotlin-kapt'
    id 'org.greenrobot.greendao'
}

greendao {
    schemaVersion 19
    daoPackage 'xxx'
    targetGenDir 'src/main/java'
}

dependencies {
    implementation 'org.greenrobot:greendao:3.3.0'
}

然后编译，还是编译不过，报错内容如下：

org.gradle.internal.execution.WorkValidationException: Some problems were found with the configuration of task ':app:greendao' (type 'DefaultTask').
  - Gradle detected a problem with the following location: '/Users/kongpf/Desktop/mail-android/app/src/main/java'.
    
    Reason: Task ':app:compileOfficialDebugKotlin' uses this output of task ':app:greendao' without declaring an explicit or implicit dependency. This can lead to incorrect results being produced, depending on what order the tasks are executed.
    
    Possible solutions:
      1. Declare task ':app:greendao' as an input of ':app:compileOfficialDebugKotlin'.
      2. Declare an explicit dependency on ':app:greendao' from ':app:compileOfficialDebugKotlin' using Task#dependsOn.
      3. Declare an explicit dependency on ':app:greendao' from ':app:compileOfficialDebugKotlin' using Task#mustRunAfter.
    
    Please refer to https://docs.gradle.org/8.0.2/userguide/validation_problems.html#implicit_dependency for more details about this problem.

翻译一下，报错的意思就是任务':app:compileOfficialDebugKotlin'使用任务':app:greendao'的输出，但没有声明显式或隐式依赖，并贴心的给出了几种解决办法和相关的gradle链接.

修改一下build.gradle脚本，添加依赖关系，编译kotlin的任务依赖greendao任务，如下：

tasks.whenTaskAdded { task ->
    if (task.name.matches("compile\w*Kotlin")) {
        task.dependsOn('greendao')
    }
}

然后再重新编译就可以编译通过✅了，最终的build.gradle脚本如下：

plugins {
    id 'com.android.application'
    id 'kotlin-android'
    id 'kotlin-android-extensions'
    id 'kotlin-kapt'
    id 'org.greenrobot.greendao'
}

greendao {
    schemaVersion 19
    daoPackage 'xxx'
    targetGenDir 'src/main/java'
}

//添加依赖关系
tasks.whenTaskAdded { task ->
    if (task.name.matches("compile\w*Kotlin")) {
        task.dependsOn('greendao')
    }
}

dependencies {
    implementation 'org.greenrobot:greendao:3.3.0'
}

参考资源

• https://github.com/greenrobot/greenDAO

• # The project encountered errors after updating Gradle Version 7.6.1 to Gradle Version 8.0+

• https://docs.gradle.org/8.0.2/userguide/validation_problems.html#implicit_dependency