GitHub Packages发布Android库报错：存在重复aar构件

我尝试按照Medium文章《Publishing Android libraries to GitHub Packages》的步骤，将Android库发布到GitHub Packages。执行./gradlew publish命令时，出现错误：Invalid publication 'release': multiple artifacts with the identical extension and classifier ('aar', 'null')。

我的build.gradle配置如下：

import java.util.Properties

plugins {
    id("com.android.library")
    id("org.jetbrains.kotlin.android")
    id("maven-publish")
}
val getVersionName = "1.0.0"
val getArtifactId = "dynamic-map"
val githubProperties = Properties()
githubProperties.load(
    rootProject.file("github.properties").inputStream()
) // Load GitHub credentials from github.properties file

android {
    ...
}

dependencies {
    ...
}

afterEvaluate {
    val gitUsername = githubProperties.getProperty("gpr.usr")
    val gitPassword = githubProperties.getProperty("gpr.key")

    println("GitHub Username: $gitUsername")
    println("GitHub Token: $gitPassword")

    publishing {
        publications {
            create<MavenPublication>("release") {
                from(components["release"])
                groupId = "com.gaurav.kumar"
                artifactId = getArtifactId
                version = getVersionName
                artifact("$buildDir/outputs/aar/${getArtifactId}-release.aar")
            }
        }
        repositories {
            maven {
                name = "DynamicMapRepo"
                url = uri("https://maven.pkg.github.com/Cypher103360/DynamicMap")

                credentials {
                    username = gitUsername
                    password = gitPassword
                }
            }
        }
    }
}

执行命令后的错误日志：

gaurav@gaurav-ThinkPad-E15-Gen-4:~/AndroidStudioProjects/DynamicMap$ ./gradlew publish

> Configure project :dynamic-map
GitHub Username: Cypher103360
GitHub Token: *****

> Task :dynamic-map:publishReleasePublicationToDynamicMapRepoRepository FAILED

FAILURE: Build failed with an exception.

* What went wrong:
Execution failed for task ':dynamic-map:publishReleasePublicationToDynamicMapRepoRepository'.
> Failed to publish publication 'release' to repository 'DynamicMapRepo'
   > Invalid publication 'release': multiple artifacts with the identical extension and classifier ('aar', 'null').

* 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 1s
25 actionable tasks: 21 executed, 4 up-to-date

错误原因 #

你在MavenPublication中重复添加了同一个aar artifact：

• from(components["release"])：Gradle会自动将release组件生成的aar文件纳入发布内容
• 手动调用artifact("$buildDir/outputs/aar/${getArtifactId}-release.aar")：再次添加了完全相同的aar文件

这导致发布包中出现两个重复的aar，触发了Gradle的重复检测错误。

解决方法 #

删除手动添加的artifact(...)语句，仅保留from(components["release"])即可。Gradle会自动处理release组件对应的artifact，无需手动指定文件路径。

修改后的publishing配置片段：

publishing {
    publications {
        create<MavenPublication>("release") {
            from(components["release"])
            groupId = "com.gaurav.kumar"
            artifactId = getArtifactId
            version = getVersionName
            // 移除重复的artifact声明
            // artifact("$buildDir/outputs/aar/${getArtifactId}-release.aar")
        }
    }
    repositories {
        maven {
            name = "DynamicMapRepo"
            url = uri("https://maven.pkg.github.com/Cypher103360/DynamicMap")

            credentials {
                username = gitUsername
                password = gitPassword
            }
        }
    }
}

修改完成后重新执行./gradlew publish，即可正常发布到GitHub Packages。

内容的提问来源于stack exchange，提问作者Cypher