We should try to update from Tomcat 8.5.24 to 9.0.2 or later.
A first try during the work on
OFBIZ-10026 causes the tests to hang when starting the testXmlMacroLibrary tests. There is no error, just no activity after more than 30 minutes.
This will need further investigation and maybe an in-depth check of the documentation, see https://tomcat.apache.org/migration-9.html#Migrating_from_8.0.x_or_8.5.x_to_9.0.x