一、Server MyEclipse Tomcat v8.5 was unable to start within 45 seconds. If the server requires more time
打开Workspace文件路径，然后修改如下图所示“servers.xml” 文件，然后修改“start-timeout”为一个较长时间1000.
二、JSP页面报错：The superclass "javax.servlet.http.HttpServlet" was not found on the Java Build Path
右键项目名称，选择Java Build Path. 然后点击“Add Liberary”, 选择“Server Runtimes”.