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(HTTP Status 500)Request processing failed; nested exception is java.lang.NullPointerException
時間 2021-07-12
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eclipse
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HTTP/TCP
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錯誤提示: eclipse中圖1: eclipse中圖1詳細情況: 瀏覽器中報錯提示: 錯誤原因: 改爲這樣: 錯誤就會消除: 結論:每用一個DAO層都要自動裝配一下,多個DAO層不能只用一個自動裝配(@Autowired),不然會報(Request processing failed; nested exception is java.lang.NullPointerException)錯誤
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