空指针异怎么办

源自：2-3 JDBC实战---搭建模型层 Ⅰ

public static void main(String[] args) throws Exception {

GoddessDao g=new GoddessDao();

List<Goddess> gs=g.query();

for (Goddess goddess : gs) {

System.out.println(goddess.getUser_name()+","+goddess.getAge());

}

空指针异常咋整？

on in thread "main" java.lang.NullPointerException

at com.imooc.dao.GoddessDao.query(GoddessDao.java:30)

at com.imooc.action.GoddessAction.main(GoddessAction.java:16)

提问者：相思枫叶丹qgd 2016-11-26 22:59