Not a tomcat expert, /var/log/tomcat9 has many files:
root@obl-ubuntu:/var/log/tomcat9# ls -ltr | tail -5
-rw-r----- 1 tomcat adm 7486 May 7 17:11 localhost_access_log.2024-05-07.txt.gz
-rw-r----- 1 tomcat adm 9418 May 8 10:00 localhost.2024-05-08.log
-rw-r----- 1 syslog adm 14272752 May 8 10:00 catalina.out
-rw-r----- 1 tomcat adm 14548 May 8 10:00 catalina.2024-05-08.log
-rw-r----- 1 tomcat adm 259 May 8 10:02 localhost_access_log.2024-05-08.txt
BUT this log file suggests there is a JRE version problem:
root@obl-ubuntu:/var/log/tomcat9# head -4 localhost.2024-05-08.log
08-May-2024 10:00:23.295 SEVERE [main] org.apache.catalina.core.StandardContext.listenerStart Error configuring application listener of class [org.xwiki.container.servlet.XWikiServletContextListener]
java.lang.UnsupportedClassVersionError: org/xwiki/container/servlet/XWikiServletContextListener has been compiled by a more recent version of the Java Runtime (class file version 61.0), this version of the Java Runtime only recognizes class file versions up to 55.0 (unable to load class [org.xwiki.container.servlet.XWikiServletContextListener])
at org.apache.catalina.loader.WebappClassLoaderBase.findClassInternal(WebappClassLoaderBase.java:2424)
at org.apache.catalina.loader.WebappClassLoaderBase.findClass(WebappClassLoaderBase.java:865