Just don't assume that the Session/Message Facade
pattern is a special case of the Facade pattern.
"Session Facade" and "Message Facade" are names for patterns which only apply to Enterprise
Java.
"Facade" is a general design pattern with somewhat different intent, motivation, applicability, and consequences. So the Session/Message Facade patterns have much less in common with the Facade pattern than the name may imply.
See:
[Session Fa�ade/POJO Fa�ade] VS [Application Service]