src/main/java/js/http/form/FormObject.java
private static Class<?> type(Field field) {
		if (Types.isKindOf(field.getType(), List.class)) {
			// for the purpose of this implementation only first parameterized
			// type matters, as result from list declaration List<E>
			return (Class<?>) ((ParameterizedType) field.getGenericType()).getActualTypeArguments()[0];
		}
		return field.getType();
	}
private static Class<?> type(Field field) {
		if (Types.isKindOf(field.getType(), List.class)) {
			// for the purpose of this implementation only first parameterized
			// type matters, as result from list declaration List<E>
			return (Class<?>) ((ParameterizedType) field.getGenericType()).getActualTypeArguments()[0];
		}
		return field.getType();
	}
Return field class or actual type argument if given field is a list.

@param field Java reflective class field.
@return field type.