private <T> ObjectConstructor<T> newDefaultConstructor(Class<? super T> rawType) {
    try {
      final Constructor<? super T> constructor = rawType.getDeclaredConstructor();
      if (!constructor.isAccessible()) {
        constructor.setAccessible(true);
      }
      return new ObjectConstructor<T>() {
        @SuppressWarnings("unchecked") // T is the same raw type as is requested
        public T construct() {
          try {
            Object[] args = null;
            return (T) constructor.newInstance(args);
          } catch (InstantiationException e) {
            // TODO: JsonParseException ?
            throw new RuntimeException("Failed to invoke " + constructor + " with no args", e);
          } catch (InvocationTargetException e) {
            // TODO: don't wrap if cause is unchecked!
            // TODO: JsonParseException ?
            throw new RuntimeException("Failed to invoke " + constructor + " with no args",
                e.getTargetException());
          } catch (IllegalAccessException e) {
            throw new AssertionError(e);
          }
        }
      };
    } catch (NoSuchMethodException e) {
      return null;
    }
  }