JDBC example is not working with Kaffe 1.0b3

I tried to run a JDBC example that come with PostgreSQL 6.4.1 using
Kaffe 1.0b3 on a RedHat 5.1 i386 Pentium machine

The example was running fine using jdk 1.1.7 but got the following error
using Kaffe :

java.sql.SQLException: IOError while reading from backend:
java.io.IOException: The backend has broken the connection. Possibly the
action you have attempted has caused it to close.
  at java/lang/Throwable.<init>(37)
  at java/lang/Exception.<init>(21)
  at java/sql/SQLException.<init>(21)
  at java/sql/SQLException.<init>(32)
  at postgresql/PG_Stream.ReceiveIntegerR(237)
  at postgresql/Connection.ReceiveFields(761)
  at postgresql/Connection.ExecSQL(734)
  at postgresql/Statement.execute(259)
  at postgresql/Statement.executeQuery(46)
  at dbt.doexample(46)
  at dbt.<init>(17)
  at dbt.main(62)

The example is creating a table, insert some records in it and try to
query the table.
The program is making ok the table, the records are inserted fine
(checked with psql) but it crashes when trying to query the table.

Does somebody knows what could happening?

Best regards,
--
Constantin Teodorescu
FLEX Consulting Braila, ROMANIA