public class CoreExports {
    private final Set<String> artifacts;

    private final Map<String, ClassLoader> packages;

    public CoreExports(CoreExtensionEntry entry) {
        this(entry.getClassRealm(), entry.getExportedArtifacts(), entry.getExportedPackages());
    }

    public CoreExports(ClassRealm realm, Set<String> exportedArtifacts, Set<String> exportedPackages) {

    public ClassRealm getClassRealm() {
        return realm;
    }

    /**
     * Returns artifacts exported by the extension, identified by groupId:artifactId string key.
     */
    public Set<String> getExportedArtifacts() {
        return artifacts;
    }

    /**
     * Returns classpath elements exported by the extension.
     */
    public Set<String> getExportedPackages() {
        return packages;
    }

        } else if (STRATEGY_PLUGIN.equals(classLoadingStrategy)) {
            coreExports.getExportedPackages().forEach((p, cl) -> realm.importFrom(cl, p));
            providedArtifacts = coreExports.getExportedArtifacts();
        } else if (STRATEGY_SELF_FIRST.equals(classLoadingStrategy)) {
            realm.setParentRealm(parentRealm);
        } else {

        apiV4Imports.put("org.slf4j", containerRealm);
        this.maven4ApiRealm = createRealm(API_V4_REALMID, RealmType.Core, null, null, apiV4Imports, null);

        this.providedArtifacts = exports.getExportedArtifacts();

        this.providedArtifactsV4 = providedArtifacts.stream()
                .filter(ga -> ga.startsWith("org.apache.maven:maven-api-"))
                .collect(Collectors.toSet());
    }

        } else if (STRATEGY_PLUGIN.equals(classLoadingStrategy)) {
            coreExports.getExportedPackages().forEach((p, cl) -> realm.importFrom(cl, p));
            providedArtifacts = coreExports.getExportedArtifacts();
        } else if (STRATEGY_SELF_FIRST.equals(classLoadingStrategy)) {
            realm.setParentRealm(parentRealm);
        } else {

                .setName("maven");

        Set<String> exportedArtifacts = new HashSet<>(coreEntry.getExportedArtifacts());
        Set<String> exportedPackages = new HashSet<>(coreEntry.getExportedPackages());
        for (CoreExtensionEntry extension : extensions) {
            exportedArtifacts.addAll(extension.getExportedArtifacts());
            exportedPackages.addAll(extension.getExportedPackages());
        }