我使用了this教程来在Ubuntu 18.04上安装Tomcat Server 9。 Tomcat Server 9可以从带有systemctl的Terminal正常启动，但是从Eclipse无法启动。错误消息如下：
starting tomcat v9.0 server at localhost has encountered a
problem The archive: /opt/tomcat/apache-tomcat-
9.0.21/bin/bootstrap.jar which is referenced by the classpath,
does not exist.