Hi there all.I'm running JBoss 2.4.4 with Tomcat 4 Embedded.My application has both a web tier and a ejb tier(which consists of 2 ejbs:one stateful and one stateless).
When I'm shutting down the server, I get the following errors:

1.[13:58:38,777,EmbeddedCatalinaServiceSX] StandardManager[/hosp] IOException while saving persisted sessions: java.rmi.MarshalException: Invalid remote object
java.rmi.MarshalException: Invalid remote object

2.[13:58:38,957,EmbeddedCatalinaServiceSX] StandardManager[/hosp] Exception unloading sessions to persistent storage
java.rmi.MarshalException: Invalid remote object

Anyway, these 2 errors both refer to the same problem.(in fact, it is a single error).What does persisted sessions mean in this context?Is Tomcat trying to save informations about the active web sessions?And if so, why does it fail?Is there any documentation about the mechanics of session management under Catalina?
Any answer would be highly appreciated