how to get a list of available groups

goodday

I am currently playing with the nntp provider. After making a connection
and selecting the defaultFolder there seems to be no way to get a list
of all the groups available on the server. 

Running the following
   Folder root= store.getDefaultFolder();
   root.open(Folder.READ_ONLY);
   Folder t[] = root.list();
   System.out.println ("found " + t.length + " folders");

the output will show:
nntp: <200 news.xs4all.nl NNRP Service Ready (posting ok).
nntp: >LIST SUBSCRIPTIONS
nntp: <215 Subscriptions in form "group"
nntp: <.
found 0 folders


According to the code list should have thrown an exception. But that
never arrived.

any ideas?