Unknown initial character set index ‘255‘ received from server. Initial client character 解決方法
從報錯中 可以看到 沒有連上數據庫 最終解決方法： 刪除 \WebContent\WEB-INF\lib目錄下的。mysql-connector的jar文件。原因是：MySQL驅動和數據庫字符集設置不搭配 原因是MySQL版本高，mysql的jar版本低造成mysql與jar的編碼錯亂引起的，我的MYSQL是8.0版本 MYSQL 5.5 之前， UTF8 編碼只支持1-3個字節;從MYSQL5.
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