Change /opt/f-secure/fsav/tomcat/bin/catalina.sh from:
#CATALINA_OUT="$LOGS_BASE"/catalina.out
CATALINA_OUT=/dev/null
to
CATALINA_OUT="$LOGS_BASE"/catalina.out
#CATALINA_OUT=/dev/null
The logfile is available in /var/opt/f-secure/fsav/tomcat/catalina.out.