Long和long的问题

PrepayEcRegister对象类中含有long handleAdminId属性，

查询数据库会抛出一下异常：

com.eidc.exception.DAOException: org.springframework.orm.hibernate3.HibernateSystemException: org.hibernate.PropertyAccessException: Null value was assigned to a property of primitive type setter of com.eidc.pojo.ec.PrepayEcRegister.handleAdminId; nested exception is org.hibernate.HibernateException: org.hibernate.PropertyAccessException: Null value was assigned to a property of primitive type setter of com.eidc.pojo.ec.PrepayEcRegister.handleAdminId。

 

但是将long handleAdminId修改成Long handleAdminId问题就解决了

 

 

这是为什么？