Foreign Keys and getImportedKeys(..)

Hi All,

After getting a metadata object from a PostgreSQL connection, I can use
the getPrimaryKeys() method
to display a table's primary keys but I can't use the getImportedKeys()
method to get its foreign keys. Can anyone help?

This works:

ResultSet pksRS = dbmd.getPrimaryKeys(null, null, tableName);
while(pksRS.next())
{
... pksRS.getString("COLUMN_NAME");
}

But this does not:

ResultSet fksRS = dbmd.getImportedKeys(null, null, tableName);
while(fksRS.next())
{
... fksRS.getString("FKCOLUMN_NAME");
}

I get a NullPointerException because fksRS is null, but I don't know why.
This is not the case when I use MS SQL Server...it does work.
Is this because the JDBC driver provided with PostgreSQL doesn't support
this function?

Thanks,

Ash.