项目出现 The superclass "javax.servlet.http.HttpServlet" was not found on the Java Build Path 解决方法

The superclass “javax.servlet.http.HttpServlet” was not found on the Java Build Path ①项目右击–>build path -->添加libraries–>server runtime–>ok ②下图 JDBC连接Oracle:ORA-28009:connection as SYS should be as SYSD
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