<Context path="" crossContext="true">

               <!-- JAAS -->

               <!--<Realm className="org.apache.catalina.realm.JAASRealm" 
               appName="PortalRealm" 
               userClassNames="com.liferay.portal.kernel.security.jaas.PortalPrincipal" roleClassNames="com.liferay.portal.kernel.security.jaas.PortalRole" />-->

               <!-- Uncomment the following to disable persistent sessions across reboots. -->

               <!-- <Manager pathname="" /> -->

               <!-- Uncomment the following to not use sessions. See the property "session.disabled" in portal.properties. -->

               <!-- <Manager className="com.liferay.support.tomcat.session.SessionLessManagerBase" /> --> 

               </Context>