数据保存到了数据库中，但是还出现null异常，怎么回事？请大神指点

Question

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    at com.huiyun.dao.base.impl.AdvertisingDaoImpl.insertVideoResource(AdvertisingDaoImpl.java:45)
    at com.huiyun.service.impl.AdvertisingServiceImpl.addVideoResource(AdvertisingServiceImpl.java:80)
    at com.huiyun.controller.AdvertisingController.newAddaddVideo(AdvertisingController.java:136)

public int insertVideoResource(VideoResource vr) {
        return getSqlSession().selectOne(Advertising.class.getName()+".insertVideoResource",vr);//就是运行到里，数据保存进去以后，就出现空指针异常
    }

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public int addVideoResource(Advertising ad) {
        if(ad==null){
            return 0;
        }
         advertisingDao.insert(ad);//
         VideoResource vr= new VideoResource();
         vr.setAid(ad.getId());
         vr.setVideoUrl(ad.getVideoUrl());
        return advertisingDao.insertVideoResource(vr);
    }

Answer 1

那你调试下程序，看看是哪里出现的问题