Path topDirectory,
            Path rootDirectory,
            InputStream in,
            OutputStream out,
            OutputStream err,
            List<CoreExtension> coreExtensions,
            Options options) {
        super(
                parserRequest,
                cwd,
                installationDirectory,
                userHomeDirectory,
                userProperties,

    }

    @Override
    public Optional<OutputStream> err() {
        return Optional.ofNullable(err);
    }

    @Override
    public Optional<List<CoreExtension>> coreExtensions() {
        return Optional.ofNullable(coreExtensions);
    }

            Path topDirectory,
            Path rootDirectory,
            InputStream in,
            OutputStream out,
            OutputStream err,
            List<CoreExtension> coreExtensions,
            O options) {
        super(
                parserRequest,
                cwd,
                installationDirectory,
                userHomeDirectory,
                userProperties,

            Path topDirectory,
            Path rootDirectory,
            InputStream in,
            OutputStream out,
            OutputStream err,
            List<CoreExtension> coreExtensions,
            List<String> jvmArguments,
            MavenOptions options) {
        super(
                parserRequest,
                cwd,
                installationDirectory,

          <version>1.0.0+</version>
          <association xml.itemsStyle="flat">
            <type>CoreExtension</type>
            <multiplicity>*</multiplicity>
          </association>
        </field>
      </fields>
    </class>
    <class xml.tagName="extension">
      <name>CoreExtension</name>
      <description>Describes a build extension to utilise.</description>
      <version>1.0.0+</version>

        R invokerRequest = context.invokerRequest;
        if (invokerRequest.coreExtensions().isEmpty()
                || invokerRequest.coreExtensions().get().isEmpty()) {
            return Collections.emptyList();
        }

        List<CoreExtension> extensions = invokerRequest.coreExtensions().get();
        ContainerConfiguration cc = new DefaultContainerConfiguration()

     *
     * @return an {@link Optional} containing the list of core extensions, or empty if not configured
     */
    @Nonnull
    Optional<List<CoreExtension>> coreExtensions();

    /**
     * Returns the options associated with this invocation request.
     *
     * @return the options object
     */
    @Nonnull
    O options();

 */
package org.apache.maven.cli.internal;

import org.apache.maven.api.cli.extensions.CoreExtension;

/**
 * Exception occurring trying to resolve a plugin.
 *
 */
public class ExtensionResolutionException extends Exception {

    private final CoreExtension extension;

    public ExtensionResolutionException(CoreExtension extension, Throwable cause) {
        super(

            Set<String> providedArtifacts,
            List<CoreExtension> configuration,
            Function<String, String> interpolator)
            throws Exception {
        List<CoreExtensionEntry> extensions = new ArrayList<>();

        DependencyFilter dependencyFilter = new ExclusionsDependencyFilter(providedArtifacts);

        for (CoreExtension extension : configuration) {
            List<Artifact> artifacts =

    protected abstract O assembleOptions(List<O> parsedOptions);

    protected List<CoreExtension> readCoreExtensionsDescriptor(LocalContext context)
            throws ParserException, IOException {
        ArrayList<CoreExtension> extensions = new ArrayList<>();
        String installationExtensionsFile = context.userProperties.get(Constants.MAVEN_INSTALLATION_EXTENSIONS);