Add OrganizationalGroup from a Java Class

Hi,
I want to add a new Organizational Group with two roles.
How could I do it from a java class?
This is the code to add a role, but to add a Group with two roles??
DirOrganizationalRole organizationalRole = null;
organizationalRole = DirOrganizationalRole.create(directorySession, "Nombre del Rol", false, "Desc. del Rol");
Thanks in advance!!

This is the JAVA code to add a role:
DirOrganizationalRole organizationalRole = null;
organizationalRole = DirOrganizationalRole.create(directorySession, "Nombre del Rol", false, "Desc. del Rol");
And this to verify if the role exist:
DirOrganizationalRole organizationalRole = null;
organizationalRole = DirOrganizationalRole.fetch(directorySession, rol);
I have tried to do this with a DirOrganizationalGroup but I can't....
Exist any documentation about this classes?
Could anybody write a simple code example?
I think it's very easy....
DirOrganizationalGroup organizationalGroup = null;
organizationalGroup = DirOrganizationalGroup.create(directorySessionRol, "DirSubdir", "Grupo Directores y Subdirectores", null, null, true, true);
And the RoleAssigment??
Thanks!!

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