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;
}

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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