*            missing file) will automatically be excluded from the realm.
     * @return The new extension realm, never {@code null}.
     */
    ClassRealm createExtensionRealm(Plugin extension, List<Artifact> artifacts);

    /**
     * Creates a new class realm for the specified plugin.
     *
     * @param plugin The plugin for which to create a realm, must not be {@code null}.

    }

    private static String getKey(Model model) {
        return "project>" + model.getGroupId() + ":" + model.getArtifactId() + ":" + model.getVersion();
    }

    @Override
    public ClassRealm createExtensionRealm(Plugin plugin, List<Artifact> artifacts) {
        Objects.requireNonNull(plugin, "plugin cannot be null");

        Map<String, ClassLoader> foreignImports = Collections.singletonMap("", getMavenApiRealm());

        extensionRecord = extensionRealmCache.get(extensionKey);
        if (extensionRecord == null) {
            ClassRealm extensionRealm = classRealmManager.createExtensionRealm(plugin, toAetherArtifacts(artifacts));

            // TODO figure out how to use the same PluginDescriptor when running mojos

            PluginDescriptor pluginDescriptor = null;