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嚴重: Servlet.service() for servlet [taotao-manager] in context with path [] threw exception [Request
時間 2021-01-06
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Tomcat
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我出現這個的原因是由於沒有注入mapper導致的,如下: 在注入的時候,每條注入語句前面都要加上一個 @Autowired 這個註解,不然只是創建了一個類的引用,而沒有創建實體對象,所以上面的圖裏面顯示爲 NULL,但是這裏面同樣會有值,只是這些值是「野」值,沒有對應的實體對象,所以也就不能被插入到數據庫,因爲在 mapper 的 xml 配置文件中需要實體對象才能把相應的值插入數據庫
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