Sending e-mail from the database through PL/SQL?!

Please help. My requirement is to send email from the database (Oracle 8.1.6) through Pl/SQL.

I used both UTL_TCP and UTL_SMTP Oracle supplied packages. The procedure is getting compiled, but when I try to execute it, I get the following error: ORA-29540: class oracle/plsql/net/TCPConnection does not exist

What is wrong? How can I add Java classes to already installed oracle?

Thanks in Advance.

Here is my procedure:

create or replace PROCEDURE SEND_MAIL

(sender IN VARCHAR2,
recipient IN VARCHAR2,
subj IN VARCHAR2,
body IN VARCHAR2)

crlf VARCHAR2(2):= CHR( 13 ) || CHR( 10 ); mesg VARCHAR2(4000);
mail_conn UTL_SMTP.CONNECTION;
cc_recipient VARCHAR2(50) default 'name_at_domain.com'; bcc_recipient VARCHAR2(50) default 'name2_at_domain.com';

BEGIN mail_conn := utl_smtp.open_connection('mail.domain.com', 25);

utl_smtp.helo(mail_conn, 'mailhost');
utl_smtp.mail(mail_conn, sender);
utl_smtp.rcpt(mail_conn, recipient);
utl_smtp.rcpt(mail_conn, cc_recipient);
utl_smtp.rcpt(mail_conn, bcc_recipient);

mesg:= 'Date: ' || TO_CHAR( SYSDATE, 'dd Mon yy hh24:mi:ss' ) || crlf ||
'From: ' || sender || crlf ||
'To: ' || recipient || crlf ||
'Cc: ' || cc_recipient || crlf ||
'Bcc: ' || bcc_recipient || crlf ||
'Subject: ' || subj || crlf;

mesg:= mesg || '' || crlf || body;

utl_smtp.data(mail_conn, mesg);
utl_smtp.quit(mail_conn);

EXCEPTION
WHEN OTHERS THEN
dbms_output.put_line(sqlerrm);

END;
/ Received on Mon Dec 11 2000 - 14:39:02 CST