Is anyone running tomcat 5.5? I'm going to upgrade at least one of my servers and will probably go for the 'remove all trace, install from scratch approach', removing the Plesk Tomcat capability in the process.
Download tomcat5.5 and the compatibility package (I'm running JRE 1.4) from apache and untar it somewhere sensible. This is your $CATALINA_HOME. chown -R the directory so that it is owned by your tomcat user.
Locate, download and install a jsvc pre-compiled rpm (got mine for FC4 from http://www.jpackage.org/)
Create an /etc/init.d/tomcat5.5 startup script that utilises JSVC. Make sure that the processes run as the tomcat user. Create the symlinks for start and stop
Replace the $CATALINA_HOME/logs directory with a symlink to /var/log/tomcat5
Edit the server.xml in $CATALINA_HOME/conf to create an AJP connector that listens on port 9008 (as per the Plesk /etc/httpd/conf/workers.properties)
Define hosts, start it up, tail the catalina.out, fix the exceptions and bask in the glow!
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Hope that helps.