错误提示：
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
错误原因：缺少编译JSP页面的库：server Runtime ，一般出现在新安装的eclipse中。
解决方法：
右键该项目---->点击build path---->选择configure build path---->下一步---->configure build path界面下找到java build path项---->Libraries选项下的Add Library---->找到server Runtime 然后next---->ok