JavaWeb:報錯資訊The superclass "javax.servlet.http.HttpServlet" was not found on the Java Build Path

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JavaWeb: 報錯資訊The superclass "javax.servlet.http.HttpServlet" was not found on the Java Build Path

一般是由於沒有添加伺服器運行時（server runtime）所致，那麼為項目設定管理員運行時：依次右鍵點擊項目名稱，選擇Build Path->Configure Build Path->彈出Java Build Path對話方塊，預設選中的是Libraries選項卡->右側點擊Add Library....->彈出Add Library對話方塊，選擇Server Runtime ->Next ->選擇伺服器，Finish -> 回到Java Build Path,點擊OK即可。那麼，錯誤將消失。

 注意：按以上方法操作時，若開啟Server Runtime後一片空白，需要設定Apache伺服器。設定方法為：window->Preferences->Server->Runtime Environment -> add --> 選擇Apache的版本後點Next，再填入你apache伺服器軟體的安裝（解壓後）地址。

JavaWeb:報錯資訊The superclass "javax.servlet.http.HttpServlet" was not found on the Java Build Path