Not sure what you mean by "admin".
If you are referring to administering
Tomcat for your customers to host Java
Applications, then Tomcat by itself does
not have admin tools for that. You
would need an addon tool. Plesk Plus (Plesk with Power Pack)
provides basic Java Tomcat support.
If you are looking for more advanced
Java hosting with Tomcat then refer
to NGASI AppServer Manager at http://www.ngasi.com