項目出現 The superclass "javax.servlet.http.HttpServlet" was not found on the Java Build Path 解決方法

The superclass 「javax.servlet.http.HttpServlet」 was not found on the Java Build Path ①項目右擊–>build path -->添加libraries–>server runtime–>ok ②下圖 JDBC連接Oracle:ORA-28009:connection as SYS should be as SYSD
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