private final CoreExtension extension;

    public ExtensionResolutionException(CoreExtension extension, Throwable cause) {
        super(
                "Extension " + extension.getId() + " or one of its dependencies could not be resolved: "
                        + cause.getMessage(),
                cause);
        this.extension = extension;
    }

    public CoreExtension getExtension() {

        return create(ArtifactFactoryRequest.build(session, groupId, artifactId, version, extension));
    }

    @Nonnull
    default Artifact create(
            @Nonnull Session session,
            String groupId,
            String artifactId,
            String version,
            String classifier,
            String extension,
            String type) {

 ---
 Hervé Boutemy
 ---
 2016-06-25
 ---

Maven Core Extensions Reference

  Maven core provides default {{{./extension.html}extensions}} as defined in <<</META-INF/maven/extension.xml>>>:

    public ExtensionPropertiesSummaryRenderer(PropertyTableRenderer propertyTableRenderer) {
        this.propertyTableRenderer = propertyTableRenderer;
    }

    public void renderTo(ClassExtensionDoc extension, Element parent) {
        if (extension.getExtensionProperties().isEmpty()) {
            return;
        }

        Document document = parent.getOwnerDocument();

        Element section = document.createElement("section");

 *
 */
class TestArtifactHandler implements ArtifactHandler {

    private String type;

    private String extension;

    TestArtifactHandler(String type) {
        this(type, type);
    }

    TestArtifactHandler(String type, String extension) {
        this.type = type;
        this.extension = extension;
    }

    @Override
    public String getClassifier() {
        return null;
    }

    @Override

@Deprecated
class TestArtifactHandler implements ArtifactHandler {

    private String type;

    private String extension;

    TestArtifactHandler(String type) {
        this(type, type);
    }

    TestArtifactHandler(String type, String extension) {
        this.type = type;
        this.extension = extension;
    }

    @Override
    public String getClassifier() {
        return null;
    }

    @Override

    private final String classifier;

    private final String extension;

    private final String packaging;

    TransformedArtifactHandler(String classifier, String extension, String packaging) {
        this.classifier = classifier;
        this.extension = requireNonNull(extension);
        this.packaging = requireNonNull(packaging);
    }

    @Override

 *       {@link java.util.Set} contract.
 *   <dt>{@link SortedSetMultimap}
 *   <dd>An extension of {@link SetMultimap} for which the {@linkplain SortedSetMultimap#get
 *       collection values} associated with a given key is a {@link java.util.SortedSet}.
 *   <dt>{@link BiMap}
 *   <dd>An extension of {@link java.util.Map} that guarantees the uniqueness of its values as well

                <?xml version="1.0" encoding="UTF-8"?>
                <extensions>
                    <extension>
                        <groupId>io.takari.maven</groupId>
                        <artifactId>takari-smart-builder</artifactId>
                        <version>1.0.2</version>
                    </extension>
                    <extension>
                        <groupId>io.takari.maven</groupId>

data class WebSocketExtensions(
  /** True if the agreed upon extensions includes the permessage-deflate extension. */
  @JvmField val perMessageDeflate: Boolean = false,
  /** Should be a value in [8..15]. Only 15 is acceptable by OkHttp as Java APIs are limited. */
  @JvmField val clientMaxWindowBits: Int? = null,
  /** True if the agreed upon extension parameters includes "client_no_context_takeover". */
  @JvmField val clientNoContextTakeover: Boolean = false,