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严重: Servlet.service() for servlet [taotao-manager] in context with path [] threw exception [Request
时间 2021-01-06
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我出现这个的原因是由于没有注入mapper导致的,如下: 在注入的时候,每条注入语句前面都要加上一个 @Autowired 这个注解,不然只是创建了一个类的引用,而没有创建实体对象,所以上面的图里面显示为 NULL,但是这里面同样会有值,只是这些值是“野”值,没有对应的实体对象,所以也就不能被插入到数据库,因为在 mapper 的 xml 配置文件中需要实体对象才能把相应的值插入数据库
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