fun getListSize(clazz: KClass<*>) {

        val session = hibernate.openSession()

        val cb = session.criteriaBuilder

        val criteria = cb.createQuery(clazz.java)
        val root = criteria.from(clazz.java)
        criteria.select(root)

        val query = session.createQuery(criteria)
        return query.resultList.size

    }

我在线路上遇到了一个错误 criteria.select(root) 声明： Kotlin: Type mismatch: inferred type is Root<out Any!>! but Selection<out Nothing!>! was expected 它可以很好地处理指定的类，例如 Country::class.java 但否则就失败了。