The superclass javax.servlet.http.HttpServlet was not found on the Java Buid Path

jsp頂部出現The superclass javax.servlet.http.HttpServlet was not found on the Java Buid Path 解決方法: 錯誤: 項目中某一.jps頁面忽然出現錯誤,鼠標點上去爲:The superclass 「javax.servlet.http.HttpServlet」 was not found on the Java Bu
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