[FIXED] Automated release to Maven Central with Gradle

Issue

I'd like to upload my jar to the Maven Central repository using gradle uploadArchives and use it in other projects as a dependency. I've followed this nice tutorial with the result that my jars are uploaded to Sonatype Nexus (see screenshot below).

The 0.1 version of my jar is available; the line

dependencies {compile 'eu.matthiasbraun:Utils:0.1'}

works just fine in the build.gradle file of my dependent project. I released the 0.1 version by clicking the Close and the Release buttons seen in the screenshot. After that I commented on the Jira ticket I had created here and was told that central sync would run every two hours.

It was my understanding that if I now wanted to release the 0.2 version of my jar, I simply would do gradle uploadArchives and change the line in build.gradle` of my dependent project to

dependencies {compile 'eu.matthiasbraun:Utils:0.2'}.

Yet, when I gradle build my dependent project (after two hours) I got the error that the dependency could not be resolved.

Here's my complete build.gradle which uploads my jar to Sonatype Nexus: link.

How can I automate the release of jars to Maven Central using Gradle?

Solution

I've used the nexus-workflow gradle plugin to automate the releasing of repositories.

I put this at the top of the build.gradle of my project I want to release:

buildscript {
    repositories {
        mavenCentral()
    }
    dependencies {
        classpath 'com.adaptc.gradle:nexus-workflow:0.6'
    }
}
apply plugin: 'nexus-workflow'

Additionally I put these three properties in ~/.gradle/gradle.properties

oss-releases.username=mySonatypeUsername
oss-releases.password=mySonatypePassword
oss-releases.url=https://oss.sonatype.org/index.html#stagingRepositories

When I want to push a release to Maven Central, I first upload the jars to Nexus using gradle uploadArchives and then I do gradle nexusStagingRelease. This closes and releases all my open repos on Nexus.

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Edit: I also found this plugin by Benjamin Muschko which seems to be an alternative to the plugin described above. I didn't try it yet, though.

Answered By - Matthias Braun