IDirectorySession session =
DirectorySystemFactory.getDirectorySystem().createSession();

IDirectoryUser user = (IDirectoryUser) session.lookupPrincipalByName
    ("user1", IDirectoryPrincipal.TYPE_USER);

IDirectoryRole role = session.createRole(IDirectoryRole.STATIC_ROLE_TYPE,
    "roleName", Collections.EMPTY_MAP);

session.addPrincipalToRole(user.getID(), role.getID());