问题 Since Tomcat 8.0 has reached end of life, I want to upgrade my application directly to Tomcat 9. When I deploy my Java based App from local to my server, I have a script which overrides the server.xml. I upgraded the server to a tomcat 9 and tried to put my application in there, but I get an error when trying to start it. org.apache.tomcat.util.digester.Digester.startElement Begin event threw exception java.lang.ClassNotFoundException: org.apache.catalina.core.JasperListener at java.net