Set assignmentsReceived = grantee.getAssignmentsReceived(null, null);
Set assignmentsReceived = grantee.getAssignmentsReceived(null, null, null);
  private Subsystem getFirstSubsystemOfReceivedAssignments    (PrivilegedSubject grantee) throws ObjectNotFoundException  {    Subsystem firstSubsystem = null;    Set assignmentsReceived = grantee.getAssignmentsReceived(null, null);    Iterator assignmentsReceivedIterator = assignmentsReceived.iterator();    if (assignmentsReceivedIterator.hasNext())    {      firstSubsystem      	= ((Assignment)(assignmentsReceivedIterator.next()))      			.getFunction().getSubsystem();    }        return firstSubsystem;  }