@Override
    public boolean isInitialized() {
        return initialized;
    }
Flag indicating if this session has been initialized once coming
online. Session initialization occurs after the session receives
the first "available" presence update from the client. Initialization
actions include pushing offline messages, presence subscription requests,
and presence statuses to the client. Initialization occurs only once
following the first available presence transition.

@return True if the session has already been initialized
xmppserver/src/main/java/org/jivesoftware/openfire/session/LocalClientSession.java