JTextField Not Displaying Properly When Backgrnd Image is set on jframe

I was making a tool in which i had to put an image as the background image and over it put some JTextField.

i have made this code:

Code:

package firstTry;

import java.awt.*;

import javax.swing.*;

public class Second extends JFrame
{
	public JPanel mainpanel = new JPanel();
	JLabel mainhead = new JLabel("Population Forecast Tool");
	
	ImageIcon back = new ImageIcon("year2.jpg");
	public JLabel backLabel = new JLabel(back);
	
	
	public Second()
	{
			
		mainpanel.setLayout(null);
		
		mainhead.setFont(new Font("Arial", 1, 20));
		mainhead.setBounds(240,10,300,30);
		backLabel.setBounds(40,45, 627, 364);

		mainpanel.add(mainhead);
		mainpanel.add(backLabel);
		
		add(mainpanel);
		
		SecondComp obj = new SecondComp(mainpanel);
	}
	
	
	public static void main(String[] args) 
	{
		Second obj = new Second();
		
		obj.setSize(800,550);
		obj.setVisible(true);
		obj.setDefaultCloseOperation(EXIT_ON_CLOSE);
		obj.setResizable(false);
		obj.setTitle("Population Predictor");
	}

}

the JTextField are added in the SecondComp class which is:

Code:

package firstTry;

import java.awt.Color;

import javax.swing.BorderFactory;
import javax.swing.JPanel;
import javax.swing.JTextField;

public class SecondComp 
{
	JTextField firstTf = new JTextField(102);
	JTextField secondTf = new JTextField(102);
	JTextField thirdTf = new JTextField(102);
	JTextField fourthTf = new JTextField(102);
	JTextField fifthTf = new JTextField(102);
	
	
	public SecondComp(JPanel mainpanel) 
	{
		
		firstTf.setBounds(148,107,102,33);
		secondTf.setBounds(148,142,102,33);
		thirdTf.setBounds(148,177,102,33);
		fourthTf.setBounds(148,212,102,33);
		fifthTf.setBounds(148,247,102,33);
		
		firstTf.setHorizontalAlignment(JTextField.CENTER);
		firstTf.setBorder(BorderFactory.createLineBorder(Color.black));
		secondTf.setHorizontalAlignment(JTextField.CENTER);
		secondTf.setBorder(BorderFactory.createLineBorder(Color.black));
		thirdTf.setHorizontalAlignment(JTextField.CENTER);
		thirdTf.setBorder(BorderFactory.createLineBorder(Color.black));
		fourthTf.setHorizontalAlignment(JTextField.CENTER);
		fourthTf.setBorder(BorderFactory.createLineBorder(Color.black));
		fifthTf.setHorizontalAlignment(JTextField.CENTER);
		fifthTf.setBorder(BorderFactory.createLineBorder(Color.black));
		
		thirdTf.setEnabled(true);
		
		
		mainpanel.add(firstTf);
		mainpanel.add(secondTf);
		mainpanel.add(thirdTf);
		mainpanel.add(fourthTf);
		mainpanel.add(fifthTf);
	}
}

The problem is that when the image is in the background the JTextField donot appear properly. I have to press TAB key in order to enable them. You can see i had tried "thirdTf.setEnabled(true);" but it also didnt work.

PLEASE SEE THE IMAGES TO UNDERSTAND

 

Code:

.....
        backLabel.setBounds(40,45, 627, 364);
        backLabel.setOpaque(false);//try inserting this line of code here
        mainpanel.add(mainhead);
......

 

Thanks for reply, but it didnt work...

 

maybe this?

Code:

......
        backLabel.setBounds(40,45, 627, 364);
        mainpanel.add(backLabel);
        mainpanel.add(mainhead);
        add(mainpanel);
        SecondComp obj = new SecondComp(mainpanel);
.......