无法将java.lang.Integer强制转换为java.math.BigInteger

我是休眠和Mssql的新手.我正在将MySQL与Mssql集成.

I am new in hibernate and Mssql. I am working on MySQL to Mssql integration.

我正面临这个例外:

java.lang.ClassCastException:无法将java.lang.Integer强制转换为java.math.BigInteger

java.lang.ClassCastException: java.lang.Integer cannot be cast to java.math.BigInteger

我的代码是:

long salesAlertsCount = ((BigInteger)HibernateUtil.getHibernateSession()
        .createSQLQuery("SELECT COUNT(a.id) FROM Activity as a,Lead as l WHERE a.what_id=l.id and l.deleted=0 and "
        + (currentUser.isAdmin() ? "a.tenant_id="+currentUser.getTenant_id():" (a.owner_id="+currentUser.getId()
        + " or a.createdBy_id="+currentUser.getId()+")")
        + " and "
        + (currentUser.isAdmin()?"l.tenant_id="+currentUser.getTenant_id():" (l.owner_id="+currentUser.getId()+")")
        + " and a.deleted=0 and a.action="
        + Constants.ACTIVITY_ACTION_SEND_SALES_ALERT
        + ""
        + " and a.viewed=0 AND a.created>='"
        + beginingOfMonth
        + "' ").uniqueResult()).longValue();

这是我的代码，以前我在这里停留在MySQL上，但是现在当我集成到Mssql中时，它显示了该异常.

This is my code I am stuck here previously this code working in MySQL but now when I integrate in Mssql it shows that exception.

提前谢谢