The message sent by other client:
<message xmlns="jabber:client" from="06ff94e1a3114959bb1ec01dc3fe828d@conference.joywok.com/avqxsbd3vjfhnev0" to="7uucd9sgakebjojd@joywok.com" type="groupchat"><x xmlns="http://joywok.dogesoft.com/status"><status code="111">myaviar8sva4fssc@joywok.com</status></x><body>晨曦邀请唐门加入了群聊</body></message>
The message received by smack:(4.1Beta1)
<message to='n685zvp7jcflrfuk@joywok.com' from='06ff94e1a3114959bb1ec01dc3fe828d@conference.joywok.com/avqxsbd3vjfhnev0' type='groupchat'><body>晨曦邀请唐门加入了群聊</body><x xmlns='http://joywok.dogesoft.com/status'><status>myaviar8sva4fssc@joywok.com</status></x></message>
The "code" attribute is missing.
It's fine in 4.0.x.