Does Plesk Onyx or Plesk Obsidian support Apache Tomcat?
Why cannot Tomcat be installed on Plesk Onyx 17.8 or Plesk Obsidian, while the license includes Tomcat support?
Support for Apache Tomcat is dropped in Plesk Onyx 17.8. In previous Plesk versions (17.5 and lower), it will be supported until reaching End-of-Life according to the Plesk Lifecycle Policy.
To have Apache Tomcat supported, do not perform the upgrade to Plesk Onyx 17.8 or Plesk Obsidian.
Note: after upgrade to Plesk Onyx 17.8 or Obsidian, Apache Tomcat will be unavailable for installing and configuring via Plesk interface. However, Tomcat will continue working and Tomcat websites and applications will be reachable but on port 9080 only.