Setting WHO columns in OAF & setting date in custom table

import java.text.SimpleDateFormat;
import java.sql.PreparedStatement;
import java.sql.Connection;
import java.sql.SQLException;
import java.sql.Timestamp;

Application Module Code

    public void SettingWhoColumns(String CStringDate) {
        java.sql.Date ConvStringDate = null;
        try {
            Connection conn = getOADBTransaction().getJdbcConnection();

            String Query = 
                "insert into XX_INSERT_WHO_COLUMNS  CREATION_DATE, CREATED_BY, LAST_UPDATE_DATE, LAST_UPDATED_BY, LAST_UPDATE_LOGIN values (:1, :2, :3, :4 ,:5)";
            PreparedStatement stmt = conn.prepareStatement(Query);
            //Creation Date
            stmt.setTimestamp(1, new Timestamp(System.currentTimeMillis()));
            stmt.setInt(2, getOADBTransaction().getUserId()); // Created by
            //Last update date 
            stmt.setTimestamp(3, new Timestamp(System.currentTimeMillis()));
            stmt.setInt(4, getOADBTransaction().getUserId()); // Last updated by
            stmt.setInt(5,getOADBTransaction().getLoginId()); // Last updated login
            //Who columns setting end here.....

            // Getting Date as a String, Converting it to Date format and setting it
            if (CStringDate != null & !("".equalsIgnoreCase(CStringDate))) {
                SimpleDateFormat dtformatter = 
                    new SimpleDateFormat("dd-MMM-yyyy");
                ConvStringDate = 
                        new java.sql.Date(dtformatter.parse(CStringDate).getTime());
                dtformatter.format(ConvStringDate);
            }
            stmt.setDate(6, ConvStringDate);
        } catch (Exception e) {
            throw new OAException("Exception" + e);
        }
    }

Thanks,

--Anil