SSM框架寫update語句報錯：Request processing failed; nested exception is java.lang.NullPointerException
Request processing failed; nested exception is java.lang.NullPointerException 最近忙於寫小學期作業，打算用ssm框架做一個簡單的web項目 進展還算順利，剛寫到編輯用戶信息這一個界面，遇到一個讓剛入門小白都頭疼的問題——空指針異常。 項目結構大致是這樣：一個標準的ssm框架 前臺是這樣的（不要吐槽我 :）表示本人審美真的
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- 1. Request processing failed; nested exception is java.lang.NullPointerException
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