largeobjects deadlock ?

HI all,

I have somme problem with largeobjects setting in a preparedstatement, here is the code with the problem in comment // :

[...]
            db.setAutoCommit(false);
[...]          
            LargeObjectManager lobj = pgdb.getLargeObjectAPI(); //pgdb is a PGConnection
            int loid = lobj.create();
            System.out.println("loid : " + loid); //this give 359648
            LargeObject image = lobj.open(loid);
            int s, count = 0;
            byte buf[] = new byte[2048];
            while ((s = affiche.read(buf, 0, buf.length)) > 0){ //affiche is an InputStream
                count += s;
                image.write(buf, 0, s);
            }
            BlobInputStream b = new BlobInputStream(image);
            addDVD.setBinaryStream(4, b, count); //addDVD is an PreparedStatement
            //addDVD.setNull(4, java.sql.Types.BINARY); // --> all work well if I decomment this and comment the preceding
            image.close();
            affiche.close();
[...]
            System.out.println("addDVD : " + addDVD.toString()); // <stream of 6503 bytes> for the fourth prm (bytea)
           
            int update = addDVD.executeUpdate(); // -->deadlocking here !!!
            System.out.println("update = " + update); //never pass here
            db.setAutoCommit(true);
[...]

Am I setting the bytea in the rigth manner ? Else, how may I do that , where are my mistakes ?

Thx u all.

andy