public ClassRealm(ClassWorld world, String id, ClassLoader baseClassLoader) {
    super(new URL[0], baseClassLoader);

    this.world = world;

    this.id = id;

    foreignImports = new TreeSet<>();

    strategy = StrategyFactory.getStrategy(this);

    lockMap = isParallelCapable ? new ConcurrentHashMap<>() : null;

    if (isParallelCapable) {
        // We must call super.getClassLoadingLock at least once
        // to avoid NPE in super.loadClass.
        super.getClassLoadingLock(getClass().getName());
    }
}