@Override
            public void propertySet(String property, Map<String, Object> params) {
                if (property.equals("provider.roster.className")) {
                    initProvider();
                }
            }
Returns true if the roster versioning is enabled.

@return true if the roster versioning is enabled.
xmppserver/src/main/java/org/jivesoftware/openfire/roster/RosterManager.java