Gradle 8:':publishMavenPublicationToMavenRepository' uses this output of task ':bundleReleaseAar' without declaring an explicit or implicit dependency

I had this issue when I updated my gradle-wrapper to use Gradle 8.0. I had this two errors:

1. Task ':publishMavenPublicationToMavenRepository' uses this output of task ':androidSourcesJar' without declaring an explicit or implicit dependency. This can lead to incorrect results being produced, depending on what order the tasks are executed.

2. Task ':publishMavenPublicationToMavenRepository' uses this output of task ':bundleReleaseAar' without declaring an explicit or implicit dependency. This can lead to incorrect results being produced, depending on what order the tasks are executed.

My build.gradle file looked like this.

buildscript {
    ...
}

apply plugin: 'com.android.library'
apply plugin: 'maven-publish'

task sourceJar(type: Jar) {
    from android.sourceSets.main.jniLibs.srcDirs
    classifier "sources"
}

version = '8.0.0'
android {
    ...
}

dependencies {
    ...
}

android.libraryVariants.all {
    def aptOutputDir = new File(buildDir, "generated/source/apt/${it.unitTestVariant.dirName}")
    it.unitTestVariant.addJavaSourceFoldersToModel(aptOutputDir)
}

publishing {
    publications {
        maven(MavenPublication) {
            version = version
            artifactId = "your_artifact_id"
            groupId = "com.yourgroup.id"
            artifact(sourceJar)
            artifact("$buildDir/outputs/aar/libraryname-release.aar")
        }
    }
    repositories {
        maven {
            def releasesUrl = "releaseurl_ifavailable"
            def snapshotsUrl = "snapshoturl_ifavailable"
            url = version.endsWith('SNAPSHOT') ? snapshotsUrl : releasesUrl
            credentials {
                username = your_username
                password = your_password
            }
        }
    }
}

task androidSourcesJar(type: Jar) {
    classifier = 'sources'
    from android.sourceSets.main.java.sourceFiles
}

artifacts {
    archives androidSourcesJar
}

I was receiving these errors when I was trying to publish my library.

I already have solution and I will post it under the solution section.

I found the answer.

Now my build.gradle file looks like this:

buildscript {
    ...
}

apply plugin: 'com.android.library'
apply plugin: 'maven-publish'

version = '8.0.0'
android {
    ...
}

dependencies {
    ...
}

android.libraryVariants.all {
    def aptOutputDir = new File(buildDir, "generated/source/apt/${it.unitTestVariant.dirName}")
    it.unitTestVariant.addJavaSourceFoldersToModel(aptOutputDir)
}

task sourceJar(type: Jar) {
    from android.sourceSets.main.jniLibs.srcDirs
    archiveClassifier = "sources"
}

task androidSourcesJar(type: Jar) {
    archiveClassifier.set("sources")
    from android.sourceSets.main.java.sourceFiles
}

afterEvaluate {
    publishing {
        publications {
            maven(MavenPublication) {
                from components.release
                version = version
                artifactId = "your_artifactId"
                groupId = "com.yourgroup.id"
            }
        }
        repositories {
            maven {
                def releasesUrl = "releaseurl_ifavailable"
                def snapshotsUrl = "snapshoturl_ifavailable"
                url = version.endsWith('SNAPSHOT') ? snapshotsUrl : releasesUrl
                credentials {
                    username = your_username
                    password = your_password
                }
            }
        }
    }
}

Basically, I had to add an afterEvaluate tag for publication of the Android library.

Also, I removed the path from which the aar file would be published because from components.release does this for me.

I hope this helps people like me who were not able to find an answer to this particular problem.

Mayank Pandit, you're right in your answer (here) to embed the publishing block within an afterEvaluate block and to replace the artifact("$buildDir/outputs/aar/libraryname-release.aar") declaration with from components.release.

If you compare the build.gradle files in your question and answer, you'll see that you've also removed the artifact(sourceJar) declaration. This means your Android library will now be published without its sources.

If you want to publish your Android library with its sources and supporting Javadoc, you need to make two changes to your build.gradle file, described below.

Firstly, add a publishing block within the android block as follows:

android {
  publishing {
    singleVariant("release") {
        withJavadocJar()
        withSourcesJar()
    }
  }
}

Secondly, change maven(MavenPublication) to release(MavenPublication).

After making these two changes, you can get rid of the sourceJar task.

Refer to the Android Gradle Plugin > Publish your library documentation page for the latest guidance on how to publish your Android libraries.