Android Gradle library dependency with library dependency using Nexus

Question

I'm switching my project over to using Gradle and an internal SonaType Nexus for hosting my dependencies. My core project depends on library project A and library project A has a dependency on library project B.

My issue is that as soon as I add LibA to my main project I get this error: "Module version com.example:LibA:1.1 depends on libraries but is not a library itself"

I have no issues adding library projects with jar dependencies with the same build script. I have seen people doing this successfully with LOCAL (in the project) android libraries but no one doing it with maven repos.

Is this a bug in gradle or did I misconfigure the library builds?

Core Project Build

buildscript {
    repositories {
        mavenCentral()
    }
    dependencies {
        classpath 'com.android.tools.build:gradle:0.6.+'
    }
}
apply plugin: 'android'

repositories {
    maven {
        url "http://localhost:8081/nexus/content/repositories/releases/"
    }

    maven {
        url "http://localhost:8081/nexus/content/repositories/central/"
    }
}

android {
    compileSdkVersion 19
    buildToolsVersion "19.0.0"

    defaultConfig {
        minSdkVersion 14
        targetSdkVersion 19
    }
}

dependencies {
    compile 'com.android.support:support-v4:+'
    compile('com.example:LibA:1.+')
}

LibA Build

buildscript {
    repositories {
        mavenCentral()
    }

    dependencies {
        classpath 'com.android.tools.build:gradle:0.6.+'
    }
}

apply plugin: 'android-library'

android {
    compileSdkVersion 19
    buildToolsVersion "19.0.0"

    defaultConfig {
        minSdkVersion 9
        targetSdkVersion 17

        versionCode = "3"
        versionName = "1.2"
    }

    android {
        sourceSets {
            main {
                manifest.srcFile 'AndroidManifest.xml'
                java.srcDirs = ['src']
                resources.srcDirs = ['src']
                aild.srcDirs = ['src']
                renderscript.srcDirs = ['src']
                res.srcDirs = ['res']
                assets.srcDirs = ['assets']
            }

        }
    }

    repositories {
        mavenCentral()
    }

    dependencies {
        compile ('com.example:LibB:1.+')
    } ...

LibB Build

buildscript {
    repositories {
        mavenCentral()
    }

    dependencies {
        classpath 'com.android.tools.build:gradle:0.6.+'
    }
}

apply plugin: 'android-library'

android {
    compileSdkVersion 19
    buildToolsVersion "19.0.0"

    defaultConfig {
        minSdkVersion 9
        targetSdkVersion 17

        versionCode = "1"
        versionName = "1.0"
    }

    android {
        sourceSets {
            main {
                manifest.srcFile 'AndroidManifest.xml'
                java.srcDirs = ['src']
                resources.srcDirs = ['src']
                aild.srcDirs = ['src']
                renderscript.srcDirs = ['src']
                res.srcDirs = ['res']
                assets.srcDirs = ['assets']
            }

        }
    }

    repositories {
        mavenCentral()
    }

    dependencies {
    } ...

Edit: Adding -info output for the error.

* What went wrong:
A problem occurred configuring project ':GradleTest'.
> Failed to notify project evaluation listener.
   > Module version com.example:LibA:1.+ depends on libraries but is not a library itself

Edit 2: Adding my local maven upload script for LibA

apply plugin: 'maven'
apply plugin: 'signing'

group = "com.example"
version = defaultConfig.versionName

configurations {
    archives {
        extendsFrom configurations.default
    }
}

signing {
    required { has("release") && gradle.taskGraph.hasTask("uploadArchives") }
    sign configurations.archives
}


uploadArchives {
    configuration = configurations.archives
    repositories.mavenDeployer {
        beforeDeployment { MavenDeployment deployment -> signing.signPom(deployment) }
        repository(url: sonatypeRepo) {
            authentication(userName: sonatypeUsername,
                    password: sonatypePassword)
        }

        pom.project {
            name 'com-example'
            packaging 'aar'
            description 'none'
            url 'https://internal github link'

            scm {
                url 'scm:git@https://internal github link'
                connection 'git@https://internal github link'
                developerConnection 'git@https://internal github link'
            }

            licenses {
                license {
                    name 'example'
                    url 'example'
                    distribution 'example'
                }
            }

            developers {
                developer {
                    id 'example'
                    name 'example'
                    email 'example'
                }
            }

            groupId "com.example"
            artifactId rootProject.name //LibA
            version defaultConfig.versionName
        }
    }
}

Answer 1

Your line in the dependencies to include LibA is wrong. To include a library project, use this:

compile project(':LibA')

If the library's directory isn't at the root of your project directory, you'll need to specify a colon-delimited path. For example, if your directory structure is:

projectFolder
  |
  +--coreProject
  |
  +--libraries
      |
      +--LibA
      |
      +--LibB

your dependency will be:

compile project(':libraries:LibA')

This is the same as the notation you use in your settings.gradle file.

Answer 2

Maybe problem is that you use mavenCentral as your repository for library projects

repositories {
    mavenCentral()
}

and not yours nexus repository where actual dependencies exists

repositories {
    maven {
        url "http://localhost:8081/nexus/content/repositories/releases/"
}

    maven {
        url "http://localhost:8081/nexus/content/repositories/central/"
    }
}

Answer 3

如果您同时上传了jar和aar的库工件，请尝试此操作。

compile 'com.example:LibA:1.1.1@aar'

Answer 4

In my work, I have used compile project(':google-play-services_lib') instead of compile ('google-play-services_lib') when I declare dependent projects in my build.gradle file. I think that is the right way to do this with Gradle: http://www.gradle.org/docs/current/userguide/dependency_management.html#sub:project_dependencies

Answer 5

if you don't want to have it as sub-module in the first build.gradle file you can add your local maven repository

mavenLocal()

//repositories
repositories {
    mavenCentral()
    mavenLocal()
}

but you need to run install on libA first.

Answer 6

Don't know for sure, just a couple of thoughts:

1. Have you tried running gradle assemble instead gradle build ? This should skip tests, as I see error is related to test task.
2. Maybe stupid, but try to remove dependcy on 2nd lib from the first and put it to your main build file listing before the first. I have a memory of something related. This way the second lib may be added to classpath allowing the first to compile.
3. Try to create .aar files by hand and upload it to repo also by hand.
4. It's a hack, but maybe it'll work: have you considered to exclude this :GradleTest module? See section 50.4.7

Answer 7

I had a similar error message after introducing by mistake a cyclic dependency between libraries:

build.gradle in commons-utils

dependencies {
    ...
    instrumentTestCompile project(':test-utils')
}

build.gradle in test-utils

dependencies {
    ...
    compile project(':commons-utils')
}

Fixing this solved the problem. The error message is not very explicit.

Answer 8

This issue has gone away with the later versions of Gradle and the Android Gradle Plugin. Seems to have just been an early release bug.