JBOSS is still not ceritified with SUN, In July,03 Jboss Anounced that they are negotiation with SUN and are commited for its compliance with J2EE standards.
That was in July, But it seems too me this is not progressing very well,
as John Schwartz blasted some organizations in the recently ongoing SUN conference.
Jonathon Swartz stated, "There are some duplicitous companies that like to compare and equate open source with not-for-profit."
Read more on this..........
But if you want to prepare of J2EE certification then there are dedicated news gropus on yahoo, you will be able to get more info there.