PgNotificationHelper

Hello i try to use PgNotificationHelper (
http://wiki.postgresql.org/wiki/PgNotificationPoller) , the method:

// not synchronized, must not access pub members
private boolean poll() {
assert(status == Status.LISTENING);
assert(Thread.currentThread().
equals(this));
try {
lastPollTimeMs = System.currentTimeMillis();
helper.poll();
return true;
} catch (SQLException e) {
reportSQLException("Polling for notifications failed, will
try to reconnect", e);
return false;
}
}

method poll in class notify.PgNotificationHelper cannot be applied to given
types required: java.sql.Connection, long, boolean found: no argument.

i know i need to add the parameters, because the parent class have:

public void poll(Connection conn, long pg_backend_pid, boolean
useDummyStatement) throws SQLException {

but, why in PgNotificationHelper don't pass the arguments? is an error?