public Collection<JID> getAdmins() {
        return AdminManager.getInstance().getAdminAccounts();
    }
Returns a collection with the JIDs of the server's admins. The collection may include
JIDs of local users and users of remote servers.

@return a collection with the JIDs of the server's admins.
xmppserver/src/main/java/org/jivesoftware/openfire/XMPPServer.java