Tomcat8 on CentOS - Session-Tomcat

[Jonathan Carpenter]

 I have a Tomcat8 (CentOS 7) question. In web.xml under <session-config>
--> <session-timeout> I seen a post on stackoverflow that you can set this
to -1 to keep the session open until the browser is closed. However I
cannot find this in the documentation. Can anyone verify this or point me
in the correct direction for a documented solution. The issue is after 30
minutes the session times out as configured, but anything over 30 does not
work.