java.lang.ExceptionInInitializerError at driver load attempt.

This short Java Class:

import java.sql.*;

public class TestIt
{
static public void main (String args[])
{
try {
// Load the driver here ...
Class.forName ("org.postgresql.Driver");
}
catch (Exception e) {
System.out.println ("Yep, got an exception.");
e.printStackTrace();
return;
}
}
}

give this Java stack trace (at the Class.forName call):

java.lang.ExceptionInInitializerError: [exception was
kaffe.util.NotImplemented: java.lang.Runtime.addShutdownHook()]
at java.lang.Class.forName(Class.java:native)
at java.lang.Class.forName(Class.java:52)
at TestIt.main(TestIt.java:9)
kaffe.util.NotImplemented: java.lang.Runtime.addShutdownHook()
at java.lang.Throwable.fillInStackTrace(Throwable.java:native)
at java.lang.Throwable.<init>(Throwable.java:38)
at java.lang.Error.<init>(Error.java:21)
at kaffe.util.NotImplemented.<init>(NotImplemented.java:22)
at java.lang.Runtime.addShutdownHook(Runtime.java:163)
at org.postgresql.core.ConnectionHook.<init>(ConnectionHook.java:54)
at org.postgresql.core.ConnectionHook.<clinit>(ConnectionHook.java:41)
at java.lang.Class.forName(Class.java:native)
at java.lang.Class.forName(Class.java:52)
at TestIt.main(TestIt.java:9)

Any idea what is going on here? The postmaster was started with pg_ctl start
-l logfile -o "-i".

I have the Java J2SE (Java 2) jdk 1.3.1_02 installed in /usr/java.
I am using the RedHat 7.2 supplied precompiled driver which is installed in
the /usr/share/pgsql/jdbc7.1-1.2.jar file.

My system is a AMD k6-2 550MHz.

Has anyone ever seen this error before?

Thanks.