Unable to connect servet, jsp to oracle 10g database.. Unable to retrieve data..

I have a class file AbstractDataAccessObject with the below code.

package com.dts.core.dao;

import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;
import java.util.Properties;

import javax.naming.InitialContext;
import javax.naming.NamingException;
import javax.sql.DataSource;

import com.dts.core.util.LoggerManager;

public class AbstractDataAccessObject
{
    public Connection mCon;
    private static Properties mProps;

    /**
     * @return the props
     */
    public Properties getProperties()
    {
        return mProps;
    }

    /**
     * @param props
     *            application properties object
     */
    public void setProperties(Properties aProps)
    {
        mProps = aProps;
    }

    public Connection getConnection()
    {
        try
        {
            Properties aProps = getProperties();
            System.out.println(aProps.getProperty("driver"));
            Class.forName(aProps.getProperty("driver"));
            mCon = DriverManager.getConnection(aProps.getProperty("url"), aProps.getProperty("duser"), aProps.getProperty("dpass"));
            System.out.println(mCon);
        }
        catch (ClassNotFoundException cnfe)
        {
            LoggerManager.writeLogWarning(cnfe);
        }
        catch (SQLException se)
        {
            LoggerManager.writeLogWarning(se);
        }
        return mCon;
    }

/*  public Connection getConnection(String cp)
    {
        try
        {
            Properties aProps = getProperties();
            Class.forName( aProps.getProperty("driver") );

            String JNDI = aProps.getProperty("JNDI_NAME");

            try
            {
                InitialContext ictx = new InitialContext();
                DataSource ds = (DataSource) ictx.lookup(JNDI);
                mCon = ds.getConnection();
            }
            catch (NamingException ne)
            {
                LoggerManager.writeLogWarning(ne);
            }
        }
        catch (ClassNotFoundException cnfe)
        {
            LoggerManager.writeLogWarning(cnfe);
        }
        catch (SQLException se)
        {
            LoggerManager.writeLogWarning(se);
        }
        return mCon;
    }*/

    public int getSequenceID(String tableName, String pkid)
    {
        int id = 0;
        try
        {
            mCon = getConnection();
            Statement st = mCon.createStatement();
            ResultSet rs = st.executeQuery("select max("+pkid+") from "+tableName); 
            if(rs.next())
                id=rs.getInt(1);
            id++;
        }
        catch(SQLException se)
        {
            LoggerManager.writeLogWarning(se);
        }
        catch(Exception e)
        {
            LoggerManager.writeLogWarning(e);
        }
        finally
        {
            try
            {
                mCon.close();
            }
            catch(SQLException se)
            {
                LoggerManager.writeLogWarning(se);  
            }
            catch(Exception e)
            {
                LoggerManager.writeLogWarning(e);
            }
        }
        return id;
    }
}

The data for the connection to the database is specified in the Web-inf >> config >>system.properties.

The code is as follows

# Sample ResourceBundle properties file

JNDI_NAME=java:com/env/Oracle/jndi
db.login=   
db.password= 
driver=oracle.jdbc.driver.OracleDriver
url=jdbc:oracle:thin:@192.168.100.20:1521:server
duser=ware
dpass=ware
logfile=E:/log/warehouse_log.txt
dbname=oracle

Let me know what is the duser and dpass.. ? I have created a new user from oracle sql*plus as rajalakshmi and password by granting privilege from scott and tiger. should I use the duser and dpass as rajalakshmi and password for duser and dpass.. or scott and tiger.

But nothing of the duser and dpass works.

If I use it also, unable to connect to backend oracle database.

Let me know what is db.username and db.password? should I leave it blank ?