Default value: RosterFlat.class.getCanonicalName()
Example: 'roster-implementation' = 'my.pack.CustomRosterImpl'
Possible values: Class extending tigase.xmpp.impl.roster.RosterAbstract.
Description: The roster-implementation
property allows you to specify a different RosterAbstract implementation. This might be useful for a customized roster storage,
extended roster content, or in some cases for some custom logic for certain roster elements.
Available since: 5.2.0