ManagerLayer manager = ManagerLayer.getInstance();
UserManager users = manager.getUsers();
SessionManager sessions = manager.getSessions();
ProjectManager projects = manager.getProjects();
String originalSsid = sessions.createSession(u2);
Session originalSession = sessions.getSession(originalSsid);
String projectId = "proj00";
String newSsid = sessions.switchToProject(originalSsid, projectId); // should throw an exception