public void removeClass(String name) {
    Class<?> clazz = classes.remove(name);

    try {
      if ((clazz != null) && (ConfigurationSerializable.class.isAssignableFrom(clazz))) {
        Class<? extends ConfigurationSerializable> serializable =
            (Class<? extends ConfigurationSerializable>) clazz;
        ConfigurationSerialization.unregisterClass(serializable);
      }
    } catch (NullPointerException ex) {
      // Boggle!
      // (Native methods throwing NPEs is not fun when you can't stop it before-hand)
    }
  }