PrintStream olderr = System.err;

        final Set<String> realms;
        if (classWorld != null) {
            realms = new HashSet<>();
            for (ClassRealm realm : classWorld.getRealms()) {
                realms.add(realm.getId());
            }
        } else {
            realms = Collections.emptySet();
        }

        try {
            if (stdout != null) {

     *
     * @return the class realm of core.
     */
    @Nonnull
    ClassRealm getRealm();

    /**
     * Shorthand method to obtain the {@link ClassWorld} used for Maven Core.
     *
     * @return the class world in use.
     */
    @Nonnull
    default ClassWorld getClassWorld() {
        return getRealm().getWorld();
    }

                session.getRepositorySession());
        assertNotNull(mojoDescriptor);
        assertEquals(goal, mojoDescriptor.getGoal());
        // igorf: plugin realm comes later
        // assertNotNull( mojoDescriptor.getRealm() );

        PluginDescriptor pluginDescriptor = mojoDescriptor.getPluginDescriptor();
        assertNotNull(pluginDescriptor);
        assertEquals("org.apache.maven.its.plugins", pluginDescriptor.getGroupId());

 * prior notice.
 *
 */
public interface PluginRealmCache {
    /**
     * CacheRecord
     */
    class CacheRecord {
        public ClassRealm getRealm() {
            return realm;
        }

        public List<Artifact> getArtifacts() {
            return artifacts;
        }

        private final ClassRealm realm;

    private final PlexusContainer container;

    @Inject
    public DefaultCoreRealm(PlexusContainer container) {
        this.container = container;
    }

    @Override
    public ClassRealm getRealm() {
        return container.getContainerRealm();
    }

     */
    public static void cloneInternal(Kerb5Authenticator to, Kerb5Authenticator from) {
        NtlmPasswordAuthenticator.cloneInternal(to, from);
        to.setUser(from.getUser());
        to.setRealm(from.getRealm());
        to.setService(from.getService());
        to.setLifeTime(from.getLifeTime());
        to.setUserLifeTime(from.getUserLifeTime());

        to.canFallback = from.canFallback;

        assertNull(auth.getUser());
        auth.setUser("");
        assertEquals("", auth.getUser());

        // Realm accessors
        assertNull(auth.getRealm());
        auth.setRealm("EXAMPLE.COM");
        assertEquals("EXAMPLE.COM", auth.getRealm());

        // Service accessors
        assertEquals("cifs", auth.getService());
        auth.setService("");
        assertEquals("", auth.getService());

    /**
     * A cache key.
     */
    interface Key {
        // marker interface for cache keys
    }

    /**
     * CacheRecord
     */
    class CacheRecord {

        public ClassRealm getRealm() {
            return realm;
        }

        public DependencyFilter getExtensionArtifactFilter() {
            return extensionArtifactFilter;
        }

        private final ClassRealm realm;

    private final CoreExports exports;

    @Inject
    public CoreExportsProvider(CoreRealm coreRealm) {
        this(new CoreExports(CoreExtensionEntry.discoverFrom(coreRealm.getRealm())));
    }

    public CoreExportsProvider(CoreExports exports) {
        this.exports = Objects.requireNonNull(exports);
    }

    @Override
    public CoreExports get() {
        return exports;
    }

            this.realm = realm;
            this.descriptor = descriptor;
            this.artifacts = artifacts;
        }

        public ClassRealm getRealm() {
            return realm;
        }

        public ExtensionDescriptor getDescriptor() {
            return descriptor;
        }

        public List<Artifact> getArtifacts() {