List sessions = flexClient.getFlexSessions();
for (Iterator iter = sessions.iterator(); iter.hasNext();)
{
FlexSession session = (FlexSession)iter.next();
if (session instanceof HttpFlexSession)
session.invalidate();
}
// Return an error to the client.
DuplicateSessionException e = new DuplicateSessionException();
e.setMessage(ERR_MSG_DUPLICATE_SESSIONS_DETECTED);