How to get the ROWID in a Trigger?

On Oracle Database 10g Enterprise Edition Release 10.2.0.2.0 - 64bit when I try below script I always get the same Rowid as "AAAAAAAAAAAAAAAAAA". Is this normal?
Thank you.
create table testrowid (a number );
create or replace trigger testrowidbins
before insert on testrowid for each row
begin
dbms_output.put_line( 'Rowid:= ' || :new.rowid );
end;
set serveroutput on
insert into testrowid values( 1 );
insert into testrowid values( 2 );
insert into testrowid values( 3 );
rollback ;
insert into testrowid values( 1 );
insert into testrowid values( 2 );
insert into testrowid values( 3 );
commit ;
insert into testrowid values( 1 );
insert into testrowid values( 2 );
insert into testrowid values( 3 );
rollback ;

Well, it was more of a rhetorical question.
Rowid is the physical location of a row in a table. During the execution of a BEFORE trigger, the row has not yet been placed in the table hence the 'AAAAA' rowid.
During your AFTER trigger, the row exists in the table and therefore has a normal rowid.

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