public Object getSessionData(String key) {
        synchronized (sessionData) {
            return sessionData.get(key);
        }
    }
Retrieves session data. This method gives access to temporary session data only. You can
retrieve earlier saved data giving key ID to receive needed value. Please see
{@link #setSessionData(String, Object)}  description for more details.

@param key a <code>String</code> value of stored data ID.
@return a <code>Object</code> value of data for given key.
@see #setSessionData(String, Object)
xmppserver/src/main/java/org/jivesoftware/openfire/session/LocalSession.java