# vanniktech/gradle-maven-publish-plugin for Gradle library publishing

> vanniktech/gradle-maven-publish-plugin configures publication for Java, Kotlin, Android, Kotlin Multiplatform, and Gradle plugin builds. It reduces project-specific setup, but concrete release procedures remain in separate documentation.

**vanniktech/gradle-maven-publish-plugin** — A Gradle plugin that publishes your Android and Kotlin libraries, including sources and javadoc,  to Maven Central or any other Nexus instance.

- Repository: https://github.com/vanniktech/gradle-maven-publish-plugin
- Website: https://vanniktech.github.io/gradle-maven-publish-plugin
- Stars: 1,753 · Forks: 140
- Language: Kotlin
- License: Apache-2.0
- Published: 2026-10-16 · Updated: 2026-10-16 · Language: en
- Canonical page: https://hysenlabs.com/projects/vanniktech-gradle-maven-publish-plugin

## Why vanniktech/gradle-maven-publish-plugin exists

vanniktech/gradle-maven-publish-plugin addresses a Gradle-specific fragmentation problem: publishing is not configured identically across Java, Android, Kotlin Multiplatform, version catalogs, and Gradle plugin projects. Gradle already ships with `maven-publish`, and several upstream plugins provide their own publishing integration. However, the README says those integrations do not remove every project-specific setup task. The plugin configures as much as possible after application and presents a common API for cases that still need manual configuration.

The intended users are maintainers of libraries built with Gradle, especially organizations that publish more than one kind of library from the same build. A multiplatform library, an Android library, and a Gradle plugin can use different underlying Gradle APIs. According to the README, the plugin gives those projects one approach instead of requiring the maintainer to remember the configuration differences between them.

Its scope is the build-side publication task. It creates a `publish` task for uploading Java, Kotlin, or Android libraries to a Maven instance. It is not a dependency manager, repository browser, or hosted publishing service. Teams looking for repository administration or artifact hosting should use a Maven repository service alongside this plugin, not instead of it.

## Supported Gradle publishing inputs

The plugin is designed around outputs produced by a defined set of Gradle plugins. The README lists `com.android.fused-library`, `com.android.kotlin.multiplatform.library`, `com.android.library`, `com.gradle.plugin-publish`, `java`, `java-gradle-plugin`, `java-library`, `java-platform`, `org.jetbrains.kotlin.jvm`, `org.jetbrains.kotlin.multiplatform`, and `version-catalog`.

This list is more useful than a broad claim of Android and Kotlin compatibility. A project must produce publication artifacts through one of these supported plugin paths. The README does not say that arbitrary Gradle tasks can be attached to publication without additional work. It also does not document support for every publication format or every Gradle version.

For a mixed repository, the common API is the main reason to choose this plugin. The README specifically identifies combined Android, Kotlin Multiplatform, and Gradle plugin projects as a case where standard configuration can vary. The plugin is intended to reduce that variation while retaining an extension point for metadata that requires project-specific decisions.

A separate `base` plugin is available for maintainers who want more control. It does not apply the default configuration and allows more customization. That gives the project two adoption paths. Teams can accept the conventional setup for common library layouts, or use the base plugin when automatic defaults would obscure what is being published.

## Maven Central, Nexus, signing, and release configuration

The plugin targets Maven Central and other Nexus instances. Maven Central support is more than a repository URL. The README states that dedicated APIs configure what the central publishing service requires and can support automatic releasing without interaction with its web interface. The exact API names, request fields, and release sequence are not present in the README, so this article does not assume particular methods or credentials.

The same publication model can also target another Maven repository or Nexus instance. This makes the plugin relevant to organizations operating an internal repository, although the README does not say that all Nexus products or repository policies are supported. Repository layout, authentication, credentials, and allowed publication endpoints must be checked against the separate documentation.

Artifact signing is addressed through in-memory GPG keys. According to the README, CI can sign artifacts by supplying the required environment variables without storing a key through an additional project-specific mechanism. The README excerpt does not name those variables, describe key import details, or state how missing credentials fail. This is a documentation boundary for security-sensitive CI configuration: the feature exists, but the visible README does not provide enough detail to reproduce it.

Configuration can also come from Gradle properties. The README says those values can apply across subprojects. That is useful for repeated repository coordinates or publishing defaults, but it also increases the need to control property scope and avoid accidental values in unrelated modules. The README does not list the property names, precedence rules, or supported property types.

## First publication setup for vanniktech/gradle-maven-publish-plugin

The README does not provide a self-contained install command, plugin block, credential setup, or executable publication example. Its setup section directs users to three documentation pages: “Publishing open source projects to Maven Central,” “Publishing to other Maven repositories,” and “configuring what to publish.” The repository contains a `gradlew` launcher and `gradlew.bat`, but the README does not identify either file as the documented first command for this plugin.

For a first real use, start with the page matching the intended destination. Maven Central users should follow the central publishing guide, while users of a private repository should follow the other Maven repositories guide. Before either release flow, review the publication configuration guide to determine which modules, artifacts, sources, and javadoc will enter the repository.

The plugin description gives the expected result of application: a Gradle `publish` task can upload supported library output to the configured Maven instance. The README also states that Java, Kotlin, and Android libraries are published with sources and javadoc. It does not document whether publication is atomic, how failed repository uploads are retried, or how a partial multi-module release behaves.

The defensible first-use procedure is therefore documentation-driven: choose the destination guide, apply the documented setup, configure what will be published, then inspect the Gradle `publish` task before any credentialed release. The excerpt does not specify the exact plugin version, repository URL, or authentication block, so no invented configuration example would be reliable.

## Where the plugin differs from maven-publish

The real alternative is Gradle's built-in `maven-publish` combined with the publishing integration already supplied by the applicable Android Gradle Plugin, `java-library`, or Kotlin Multiplatform plugin. That approach exposes Gradle's publication model directly. Maintainers configure publications, repositories, and signing through the APIs provided by Gradle and the plugin that owns each project type.

vanniktech/gradle-mublish-plugin takes a higher-level approach. The README positions it as a layer that configures common details automatically and presents a unified API across supported project types. It also adds focused support for Maven Central release handling, automatic releases, in-memory GPG signing, and Gradle property based configuration. These are integration features, not a different repository protocol.

This approach creates a trade-off. Teams already fluent in the native Gradle APIs retain direct control and avoid an additional plugin abstraction. Teams maintaining several project types can reduce repeated configuration knowledge. Organizations with unusual coordinates, custom repository requirements, or tightly governed CI release rules may prefer the native path until the plugin's dedicated guides demonstrate that every requirement is covered.

The base plugin makes the boundary explicit. Default configuration is omitted when a maintainer needs finer customization. That is preferable to relying on automatic behavior in a release pipeline whose artifact set must be predictable.

## Maintenance, releases, and upgrade boundaries

The repository is not archived. Its last push was on 2026-10-13, so the repository has recent activity. The listed releases include `0.37.0` on 2026-06-21, `0.37.0-rc1` on 2026-06-20, and `0.36.0` on 2026-01-18. The presence of both a release candidate and its final version is documented, but the README does not describe the compatibility policy between plugin versions and Gradle or upstream Android and Kotlin plugins.

The plugin is written primarily in Kotlin and uses a Gradle build. An upgrade can therefore involve more than editing one repository setting. Maintainers must account for their own Gradle build, the publishing plugin version, the plugin marker metadata, supported upstream plugins, signing configuration, and repository credentials. The repository includes `CHANGELOG.md` and `RELEASING.md`, but their contents are not available in the excerpt, so no individual migration or breaking-change claim can be made here.

The Apache-2.0 license covers the plugin's source code. It does not by itself determine signing, credential, repository, or organizational release responsibilities. Maintainers should keep those operational responsibilities separate from the plugin's source-code license.

## Operational limits of automated Gradle publishing

The main limitation is incomplete executable guidance in the README. It identifies supported plugins, default capabilities, and destination categories, but it does not publish a complete setup. It also omits credential variable names, signing-key handling details, retry behavior, rollback behavior, and artifact verification procedures. The separate documentation links are necessary reading for a release pipeline.

The plugin also automates defaults. That can be undesirable when a repository has strict requirements for artifact identity, publication contents, signing, or provenance. The existence of the base plugin indicates a path toward customization, but the README does not explain how much configuration remains manual after applying it.

This is the wrong tool when the team wants a standalone service, repository administration interface, or generic release orchestration platform. The project is a Gradle plugin that prepares and uploads supported build output. It does not replace Maven Central or Nexus, and the README does not claim to provide repository hosting.

The plugin fits Gradle-based library maintainers who want shared publishing configuration across multiple supported project types. Before adoption, check the destination guide, inspect which artifacts the configuration will expose, and confirm that the documented signing and release flow matches the CI environment already in use.

## Conclusion

Library maintainers should consider this plugin when one publishing interface across several Gradle project types would simplify their build. Projects requiring exact control over every publication or undocumented release behavior should inspect the relevant configuration guide first. The initial judgement depends on whether its configuration model covers the selected Android, Kotlin, Java, or Gradle plugin publication setup.

## FAQ

### Which project types can vanniktech/gradle-maven-publish-plugin publish?

The README lists support for output from several Android, Java, Kotlin, Kotlin Multiplatform, version-catalog, and Gradle plugin types. They include `com.android.library`, `java-library`, `org.jetbrains.kotlin.multiplatform`, `java-gradle-plugin`, and `version-catalog`.

### Can vanniktech/gradle-maven-publish-plugin publish to private Maven repositories?

The project describes support for Maven Central and other Nexus instances. It links to separate documentation for publishing to other Maven repositories, but the README does not enumerate repository products or authentication options.

### How does vanniktech/gradle-maven-publish-plugin handle GPG signing?

The README states that CI can sign artifacts with in-memory GPG keys by setting the required environment variables. It does not name those variables or document the complete key setup in the excerpt.

## Sources

- [License: Apache-2.0](https://github.com/vanniktech/gradle-maven-publish-plugin/blob/main/LICENSE)
- [Project website](https://vanniktech.github.io/gradle-maven-publish-plugin)
- [README](https://github.com/vanniktech/gradle-maven-publish-plugin/blob/main/README.md)
- [Releases](https://github.com/vanniktech/gradle-maven-publish-plugin/releases)
- [vanniktech/gradle-maven-publish-plugin on GitHub](https://github.com/vanniktech/gradle-maven-publish-plugin)

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Hysen Labs editorial analysis, written from the project's own repository and release notes. Cite the canonical page: https://hysenlabs.com/projects/vanniktech-gradle-maven-publish-plugin