bug jdbc 7.2 ?

I think I have found a bug in the jdbc driver 7.2 that doesn't exist on the
7.3.

I have a table :

CREATE TABLE "t_contenu_item_devise" (
"cid_id" bigint NOT NULL,
"user_id_creation" bigint,
"date_edition" timestamp with time zone,
"date_creation" timestamp with time zone,
"guarantor_id" bigint,
"itd_id" bigint NOT NULL,
"cnu_id" bigint NOT NULL,
"cid_valeur" numeric(12,2) NOT NULL,
"user_id_edition" bigint,
Constraint "t_contenu_item_devise_pkey" Primary Key ("cid_id")
);

With constraint on another table (check foreign keys on insert)

CREATE CONSTRAINT TRIGGER "<unnamed>" AFTER INSERT OR UPDATE ON
"t_contenu_item_devise" FROM "t_item_devise" NOT DEFERR
ABLE INITIALLY IMMEDIATE FOR EACH ROW EXECUTE PROCEDURE "RI_FKey_check_ins"
('<unnamed>', 't_contenu_item_devise', 't_it
em_devise', 'UNSPECIFIED', 'itd_id', 'itd_id');

Than I execute a query that must return me an error :

INSERT INTO t_contenu_item_devise VALUES (322000000663, 54009, '2002-10-25
21:06:22+02', '2002-10-25 21:06:22+02', 54, 37, 322000000033, 0.00, 54009);

The error is :

ERROR: <unnamed> referential integrity violation - key referenced from
t_contenu_item_devise not found in t_contenu

Than I use a small test tools to execute my query in a loop (test.java)

And the jdbc sometimes send me an error and sometimes the number of row
executed (1 in the liste)...

1 error 1 ERROR: <unnamed> referential integrity violation - key
referenced from t_contenu_item_devise not found in t_contenu
2 1
3 error 3 ERROR: <unnamed> referential integrity violation - key
referenced from t_contenu_item_devise not found in t_contenu
4 error 4 ERROR: <unnamed> referential integrity violation - key
referenced from t_contenu_item_devise not found in t_contenu
5 1
6 error 6 ERROR: <unnamed> referential integrity violation - key
referenced from t_contenu_item_devise not found in t_contenu
7 1
8 error 8 ERROR: <unnamed> referential integrity violation - key
referenced from t_contenu_item_devise not found in t_contenu
9 error 9 ERROR: <unnamed> referential integrity violation - key
referenced from t_contenu_item_devise not found in t_contenu
10 1
11 error 11 ERROR: <unnamed> referential integrity violation - key
referenced from t_contenu_item_devise not found in t_contenu
12

If I execute the same query via odbc more than one time I don't have this
error. With the pg73jdbc2.jar I don't have this error.
So the error seems to be from pg72jdbc2.jar...

I use psotgres 7.2.1 (rpm) in linux Red Hat 7.2 and sun jsdk 1.4.1.