What are these new roles after SP12 install?

Since installing SP12 for J2EE 6.40 & Portal 6 I have noticed the following four new roles have been installed. But I can't work out what extra funcationalty they provide, does anyone know?

Cheers

Roles are-

SAP_JAVA_NWADMIN_CENTRAL

SAP_JAVA_NWADMIN_CENTRAL_READONLY

SAP_JAVA_NWADMIN_LOCAL_READONLY

SAP_JAVA_NWADMIN_LOCAL_READONLY