JDBC 7.3 dev (Java 2 SDK 1.4.0)

Hello,
  I have simple table with column ID and values '4' in this.
I user 7.3 beta1 (from cvs 05.09.2002) and autocommit off in postgresql.conf.
Next program don't work .
I am tried with compiled postgresql.jar form CVS and with
pg73b1jdbc3.jar from 05.09.2002 on jdbc.postgresql.org

What is wrong ?

regards
Haris Peco
import java.io.*;
import java.sql.*;
import java.text.*;

public class PrepStatTest
{
	Connection db;	
	String stat="DELETE FROM org_ban WHERE \"id\" = ?";
	String delid = "4";
	public PrepStatTest() throws ClassNotFoundException, FileNotFoundException, 
IOException, SQLException
	{
		Class.forName("org.postgresql.Driver");
		db = DriverManager.getConnection("jdbc:postgresql://spnew/snpe", "snpe", 
"snpe");
		PreparedStatement st = db.prepareStatement(stat);
    		st.setString(1, delid);
    		int rowsDeleted = st.executeUpdate();
		System.out.println("Rows deleted " + rowsDeleted);
		db.commit();
		st.close();
		db.close();
	}

	public static void main(String args[])
	{
		try
		{
			PrepStatTest test = new PrepStatTest();
		}
		catch (Exception ex)
		{
			System.err.println("Exception caught.\n" + ex);
			ex.printStackTrace();
		}
	}
}