錯誤提示：
Multiple annotations found at this line: - The superclass "javax.servlet.http.HttpServlet" was not found on the Java Build Path - The superclass "javax.servlet.http.HttpServlet" was not found on the Java Build Path
錯誤原因：缺少編譯JSP頁面的庫：server Runtime ，一般出現在新安裝的eclipse中。
解決方法：
右鍵該項目---->點擊build path---->選擇configure build path---->下一步---->configure build path界面下找到java build path項---->Libraries選項下的Add Library---->找到server Runtime 然后next---->ok