title: JasperListener? Upgrading from Tomcat 8 to Tomcat 9
body: <p>Since Tomcat 8.0 has reached end of life, I want to upgrade my application directly to Tomcat 9.</p>
  
  <p>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.</p>
  
  <pre><code>org.apache.tomcat.util.digester.Digester.startElement Begin event threw exception
  java.lang.ClassNotFoundException: org.apache.catalina.core.JasperListener
  at java.net.URLClassLoader.findClass(URLClassLoader.java:381)
  at java.lang.ClassLoader.loadClass(ClassLoader.java:424)
  </code></pre>
  
  <p>Tomcat 9 does not know JasperListener. I googled this issue and found the "Jasper How to" page from apache, but I do not get it. Is Jasper now installed without me having to insert the JasperListener in the server.xml? And do I have to update anything else when upgrading from Tomcat 8 to 9?</p>