This part of the doc:
http://www.jboss.org/file-access/default/members/jbossmessaging/freezone/docs/usermanual-2.0.0.beta2/html/persistence.html#persistence.enabled
states that null-persistence means no-paging.
The user has actually the possibility to configure null-persistence and still page messages on disk.
Should I fix the documentation somehow, or should I remove the feature?