Package org.gradle.api.publish.maven

# Interface MavenPublication

All Superinterfaces:
  `Named`, `Publication`

public interface MavenPublication extends Publication
A `MavenPublication` is the representation/configuration of how Gradle should publish something in Maven format. You directly add a named Maven publication the project's `publishing.publications` container by providing `MavenPublication` as the type.

     publishing {
       publications {
         myPublicationName(MavenPublication) {
           // Configure the publication here
         }
       }
     }

The default Maven POM identifying attributes are mapped as follows:

- `groupId` - `project.group`
- `artifactId` - `project.name`
- `version` - `project.version`

For certain common use cases, it's often sufficient to specify the component to publish, and nothing more (`from(org.gradle.api.component.SoftwareComponent)`. The published component is used to determine which artifacts to publish, and which dependencies should be listed in the generated POM file.

To add additional artifacts to the set published, use the `artifact(Object)` and `artifact(Object, org.gradle.api.Action)` methods. You can also completely replace the set of published artifacts using `setArtifacts(Iterable)`. Together, these methods give you full control over what artifacts will be published.

To customize the metadata published in the generated POM, set properties, e.g. `MavenPom.getDescription()`, on the POM returned via the `getPom()` method or directly by an action (or closure) passed into `pom(org.gradle.api.Action)`. As a last resort, it is possible to modify the generated POM using the `MavenPom.withXml(org.gradle.api.Action)` method.

     // Example of publishing a Java module with a source artifact and a customized POM
     plugins {
         id 'java'
         id 'maven-publish'
     }

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

     publishing {
       publications {
         myPublication(MavenPublication) {
           from components.java
           artifact sourceJar
           pom {
             name = "Demo"
             description = "A demonstration of Maven POM customization"
             url = "http://www.example.com/project"
             licenses {
               license {
                 name = "The Apache License, Version 2.0"
                 url = "http://www.apache.org/licenses/LICENSE-2.0.txt"
               }
             }
             developers {
               developer {
                 id = "johnd"
                 name = "John Doe"
                 email = "john.doe@example.com"
               }
             }
             scm {
               connection = "scm:svn:http://subversion.example.com/svn/project/trunk/"
               developerConnection = "scm:svn:https://subversion.example.com/svn/project/trunk/"
               url = "http://subversion.example.com/svn/project/trunk/"
             }
           }
         }
       }
     }

Since:
  1.4

- ## Nested Class Summary

  ## Nested classes/interfaces inherited from interface org.gradle.api.Named

  `Named.Namer`

- ## Method Summary

  Modifier and Type
  Method
  Description
  `MavenArtifact`
  `artifact(Object source)`
  Creates a custom `MavenArtifact` to be included in the publication.
  `MavenArtifact`
  `artifact(Object source, Action<? super MavenArtifact> config)`
  Creates an `MavenArtifact` to be included in the publication, which is configured by the associated action.
  `void`
  `from(SoftwareComponent component)`
  Provides the software component that should be published.
  `String`
  `getArtifactId()`
  Returns the artifactId for this publication.
  `MavenArtifactSet`
  `getArtifacts()`
  Returns the complete set of artifacts for this publication.
  `String`
  `getGroupId()`
  Returns the groupId for this publication.
  `MavenPom`
  `getPom()`
  The POM that will be published.
  `String`
  `getVersion()`
  Returns the version for this publication.
  `void`
  `pom(Action<? super MavenPom> configure)`
  Configures the POM that will be published.
  `void`
  `setArtifactId(String artifactId)`
  Sets the artifactId for this publication.
  `void`
  `setArtifacts(Iterable<?> sources)`
  Clears any previously added artifacts from `getArtifacts()` and creates artifacts from the specified sources.
  `void`
  `setGroupId(String groupId)`
  Sets the groupId for this publication.
  `void`
  `setVersion(String version)`
  Sets the version for this publication.
  `void`
  `suppressAllPomMetadataWarnings()`
  Silences all the compatibility warnings for the Maven publication.
  `void`
  `suppressPomMetadataWarningsFor(String variantName)`
  Silences the compatibility warnings for the Maven publication for the specified variant.
  `void`
  `versionMapping(Action<? super VersionMappingStrategy> configureAction)`
  Configures the version mapping strategy.

  ### Methods inherited from interface org.gradle.api.Named

  `getName`

  ### Methods inherited from interface org.gradle.api.publish.Publication

  `withBuildIdentifier, withoutBuildIdentifier`

- ## Method Details

  - ### getPom

    MavenPom getPom()
    The POM that will be published.
    Returns:
      The POM that will be published.

  - ### pom

    void pom(Action<? super MavenPom> configure)
    Configures the POM that will be published. The supplied action will be executed against the `getPom()` result. This method also accepts a closure argument, by type coercion.
    Parameters:
      `configure` - The configuration action.

  - ### from

    void from(SoftwareComponent component)
    Provides the software component that should be published.
    - Any artifacts declared by the component will be included in the publication.
    - The dependencies declared by the component will be included in the published meta-data.
    Currently 3 types of component are supported: 'components.java' (added by the JavaPlugin), 'components.web' (added by the WarPlugin) and `components.javaPlatform` (added by the JavaPlatformPlugin). For any individual MavenPublication, only a single component can be provided in this way. The following example demonstrates how to publish the 'java' component to a Maven repository.

         plugins {
             id 'java'
             id 'maven-publish'
         }

         publishing {
           publications {
             maven(MavenPublication) {
               from components.java
             }
           }
         }

    Parameters:
      `component` - The software component to publish.

  - ### artifact

    MavenArtifact artifact(Object source)
    Creates a custom `MavenArtifact` to be included in the publication. The `artifact` method can take a variety of input:
    - A `PublishArtifact` instance. Extension and classifier values are taken from the wrapped instance.
    - An `AbstractArchiveTask` instance. Extension and classifier values are taken from the wrapped instance.
    - Anything that can be resolved to a `File` via the `Project.file(Object)` method. Extension and classifier values are interpolated from the file name.
    - A `Map` that contains a 'source' entry that can be resolved as any of the other input types, including file. This map can contain a 'classifier' and an 'extension' entry to further configure the constructed artifact.
    The following example demonstrates the addition of various custom artifacts.

         plugins {
             id 'maven-publish'
         }

         task sourceJar(type: Jar) {
           archiveClassifier = "sources"
         }

         publishing {
           publications {
             maven(MavenPublication) {
               artifact sourceJar // Publish the output of the sourceJar task
               artifact 'my-file-name.jar' // Publish a file created outside of the build
               artifact source: sourceJar, classifier: 'src', extension: 'zip'
             }
           }
         }

    Parameters:
      `source` - The source of the artifact content.

  - ### artifact

    MavenArtifact artifact(Object source, Action<? super MavenArtifact> config)
    Creates an `MavenArtifact` to be included in the publication, which is configured by the associated action. The first parameter is used to create a custom artifact and add it to the publication, as per `artifact(Object)`. The created `MavenArtifact` is then configured using the supplied action, which can override the extension or classifier of the artifact. This method also accepts the configure action as a closure argument, by type coercion.

         plugins {
             id 'maven-publish'
         }

         task sourceJar(type: Jar) {
           archiveClassifier = "sources"
         }

         publishing {
           publications {
             maven(MavenPublication) {
               artifact(sourceJar) {
                 // These values will be used instead of the values from the task. The task values will not be updated.
                 classifier = "src"
                 extension = "zip"
               }
               artifact("my-docs-file.htm") {
                 classifier = "documentation"
                 extension = "html"
               }
             }
           }
         }

    Parameters:
      `source` - The source of the artifact.
      `config` - An action to configure the values of the constructed `MavenArtifact`.

  - ### setArtifacts

    void setArtifacts(Iterable<?> sources)
    Clears any previously added artifacts from `getArtifacts()` and creates artifacts from the specified sources. Each supplied source is interpreted as per `artifact(Object)`. For example, to exclude the dependencies declared by a component and instead use a custom set of artifacts:

         plugins {
             id 'java'
             id 'maven-publish'
         }

         task sourceJar(type: Jar) {
           archiveClassifier = "sources"
         }

         publishing {
           publications {
             maven(MavenPublication) {
               from components.java
               artifacts = ["my-custom-jar.jar", sourceJar]
             }
           }
         }

    Parameters:
      `sources` - The set of artifacts for this publication.

  - ### getArtifacts

    MavenArtifactSet getArtifacts()
    Returns the complete set of artifacts for this publication.
    Returns:
      the artifacts.

  - ### getGroupId

    String getGroupId()
    Returns the groupId for this publication.

  - ### setGroupId

    void setGroupId(String groupId)
    Sets the groupId for this publication.

  - ### getArtifactId

    String getArtifactId()
    Returns the artifactId for this publication.

  - ### setArtifactId

    void setArtifactId(String artifactId)
    Sets the artifactId for this publication.

  - ### getVersion

    String getVersion()
    Returns the version for this publication.

  - ### setVersion

    void setVersion(String version)
    Sets the version for this publication.

  - ### versionMapping

    void versionMapping(Action<? super VersionMappingStrategy> configureAction)
    Configures the version mapping strategy. For example, to use resolved versions for runtime dependencies:

         plugins {
             id 'java'
             id 'maven-publish'
         }

         publishing {
           publications {
             maven(MavenPublication) {
               from components.java
               versionMapping {
                 usage('java-runtime'){
                   fromResolutionResult()
                 }
               }
             }
           }
         }

    Parameters:
      `configureAction` - the configuration
    Since:
      5.2

  - ### suppressPomMetadataWarningsFor

    void suppressPomMetadataWarningsFor(String variantName)
    Silences the compatibility warnings for the Maven publication for the specified variant. Warnings are emitted when Gradle features are used that cannot be mapped completely to Maven POM.
    Parameters:
      `variantName` - the variant to silence warning for
    Since:
      6.0

  - ### suppressAllPomMetadataWarnings

    void suppressAllPomMetadataWarnings()
    Silences all the compatibility warnings for the Maven publication. Warnings are emitted when Gradle features are used that cannot be mapped completely to Maven POM.
    Since:
      6.0