Gradle "Plugin [id: 'x'] was not found in any of the following sources" - Fix in CI

Gradle resolved your plugins {} block and could not find the plugin id (and version) in any configured plugin source. Either the coordinates are wrong, the version is missing, or the repository that hosts it is not declared.

What this error means

Configuration fails with Plugin [id: 'com.example.foo', version: '1.2.3'] was not found in any of the following sources: followed by a list (Gradle Core, Plugin Portal, included builds). The build never reaches task execution.

* What went wrong:
Plugin [id: 'org.example.greeting', version: '1.0.0'] was not found in any
of the following sources:

- Gradle Core Plugins (not a core plugin...)
- Plugin Repositories (could not resolve plugin artifact
  'org.example.greeting:org.example.greeting.gradle.plugin:1.0.0')

Common causes

Wrong plugin id or missing version

A typo in the id, or a community plugin applied with no version, leaves Gradle unable to resolve a marker artifact.

Plugin lives on a repo not declared in pluginManagement

A custom or third-party plugin is hosted on a private registry that is not listed in settings.gradle pluginManagement { repositories }.

Plugin Portal unreachable

A locked-down runner cannot reach plugins.gradle.org, so the marker artifact cannot be fetched.

How to fix it

Fix the id and pin a version

Use the exact plugin id and an existing version in the plugins block.

plugins {
  id 'org.example.greeting' version '1.0.1'
}

Declare the hosting repository

Add the plugin repository in settings so Gradle knows where to look.

// settings.gradle
pluginManagement {
  repositories {
    gradlePluginPortal()
    maven { url 'https://nexus.example.com/repository/gradle-plugins/' }
  }
}

Map the id to coordinates explicitly

For non-portal plugins, resolve the id to a module via a resolution strategy.

pluginManagement {
  resolutionStrategy {
    eachPlugin {
      if (requested.id.id == 'org.example.greeting')
        useModule("org.example:greeting-plugin:${requested.version}")
    }
  }
}

How to prevent it

• Declare all plugin repositories in settings.gradle pluginManagement.
• Pin plugin versions; do not apply community plugins without a version.
• Mirror the Plugin Portal through a proxy on locked-down runners.

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