返回值exitUserInfo的地址是有的 但是获取get值时，为空！！！

Question

public UserInfo longin(UserInfo userInfo) throws SQLException {QueryRunner queryRunner = new QueryRunner(JDBCUtils.getDataSource());String sql = "select * from user_info where user_name=? and user_password=?";UserInfo exitsUserInfo = queryRunner.query(sql,new BeanHandler<UserInfo>(UserInfo.class), userInfo.getUserName(),userInfo.getUserPassword());System.out.println(exitsUserInfo.getUserPassword());return exitsUserInfo;}

Answer 1

UserInfo类的定义里需要无参构造函数

Answer 2

打断点调试， 查看exitsUserInfo 里的password 是不是空值