Problems with DatabaseMetaData.getImportedKeys

Hi,

When I try to run the program DatabaseTest.java (see attach) with the
db-test database (see attach: db-test.sql) I get duplicated tuples for
each foreign key:

<Database.getKeyInfo> for table: table_1
>>> Imported keys

>>> Exported keys:

1: c2
from table_1 to table_2.t2_f2

1: c1
from table_1 to table_2.t2_f1

1: c2
from table_1 to table_2.t2_f2

1: c1
from table_1 to table_2.t2_f1

<Database.getKeyInfo> for table: table_2
>>> Imported keys

1: c2
from table_1 to table_2.t2_f2

1: c1
from table_1 to table_2.t2_f1

1: c2
from table_1 to table_2.t2_f2

1: c1
from table_1 to table_2.t2_f1
>>> Exported keys:

Is there any way of avoiding these duplicated tuples?

I'm running PostgreSQL version 7.3.2 (Mandrake 9.1) with pg73jdbc3.jar
driver.

Thanks,

carlos