Hi, A hopefully simple implementation question ... The SAGA Java API defines an abstract factory for obtaining a job service: public abstract class JobFactory { ... protected abstract JobService doCreateJobService(Session session, URL rm) throws NotImplemented, IncorrectURL, AuthenticationFailed, AuthorizationFailed, PermissionDenied, Timeout, NoSuccess; ... etc } Now, Session is defined as containing multiple contexts. So in principle there is nothing to stop me creating a Session containing multiple user identities and passing it to create a JobService. However, if I then submit a job using this JobService, it would appear to be undefined which identity would be used to attempt to submit the job. So it would seem to me that I should always throw an exception if an attempt is made to create a job service with multiple identities. Am I missing something here? Regards, Malcolm. ---------------------------------------------------- |epcc| - Malcolm Illingworth EPCC, University of Edinburgh James Clerk Maxwell Building Mayfield Road E-mail: malcolm@epcc.ed.ac.uk Edinburgh EH9 3JZ Phone: + 44 (0) 131 651 3388 United Kingdom Fax: + 44 (0) 131 650 6555 -------------------------------------------------------------