java.lang.ClassCastException：java.math.BigInteger不能转换为java.lang.Long(java.lang.ClassCastException: java.math.BigInteger cannot be cast to java.lang.Long)

 我想返回使用原生sql的行数。 但控制台说我java.math.BigInteger cannot be cast to java.lang.Long 。 怎么了？ 这是我的方法： 
 
public Long getNumRows(Integer id){

        Session session = null;

        session = this.sessionFactory.getCurrentSession();
        Query query = session
                .createSQLQuery("SELECT COUNT(*) FROM controllnews WHERE news_id="
                        + id + ";");
        List firstResult = query.list();

        return (Long) firstResult.get(0);


    }

I want to return number of rows using native sql. But console says me java.math.BigInteger cannot be cast to java.lang.Long. What's wrong? This is my method:
 
public Long getNumRows(Integer id){

        Session session = null;

        session = this.sessionFactory.getCurrentSession();
        Query query = session
                .createSQLQuery("SELECT COUNT(*) FROM controllnews WHERE news_id="
                        + id + ";");
        List firstResult = query.list();

        return (Long) firstResult.get(0);


    }

原文：https://stackoverflow.com/questions/18218471