Dear all
Just wanted to give this hint because it took me some hours to find this.
I found the options for jboss and tried it on Tomcat. Luckily this works also there.
CATALINA_OPTS=-Dsun.rmi.dgc.client.gcInterval=3600000 -Dsun.rmi.dgc.server.gcInterval=3600000 -XX:+UseConcMarkSweepGC -XX:+CMSPermGenSweepingEnabled -XX:+CMSClassUnloadingEnabled -Xverify:none