NetBeans - Set background jPanel

nb-jpanel-bg-image.java

jPanel1 = new javax.swing.JPanel(){
    @Override
    public void paintComponent(Graphics g)
    {
        g.drawImage(src, 0, 0, null);
    }
};

// Code of sub-components and layout - not shown here

add(jPanel1, new org.netbeans.lib.awtextra.AbsoluteConstraints(0, 0, 400, 300));


//Aaand Image:
        try {
            src = ImageIO.read(new File("splash.png"));
        } catch (IOException ex) {
            Logger.getLogger(Boot.class.getName()).log(Level.SEVERE, null, ex);
        }

/////////////////////////////////FULL CODE://////

package taban;

import java.awt.Frame;
import java.awt.Graphics;
import java.awt.Image;
import java.awt.Toolkit;
import javax.swing.ImageIcon;

/**
 *
 * @author erkanmdr
 */
public class Boot extends java.awt.Frame {

    Image src;

    /**
     * Creates new form Boot
     */
    public Boot() {
        src = Toolkit.getDefaultToolkit().createImage("/home/erkanmdr/splash.png");

        initComponents();
    }

    /**
     * This method is called from within the constructor to initialize the form.
     * WARNING: Do NOT modify this code. The content of this method is always
     * regenerated by the Form Editor.
     */
    // <editor-fold defaultstate="collapsed" desc="Generated Code">                          
    private void initComponents() {

        jPanel1 = new javax.swing.JPanel(){
            @Override
            public void paintComponent(Graphics g)
            {
                g.drawImage(src, 0, 0, null);
            }
        };

        setUndecorated(true);
        setPreferredSize(new java.awt.Dimension(400, 300));
        setResizable(false);
        setSize(new java.awt.Dimension(400, 300));
        addWindowListener(new java.awt.event.WindowAdapter() {
            public void windowClosing(java.awt.event.WindowEvent evt) {
                exitForm(evt);
            }
        });
        setLayout(new org.netbeans.lib.awtextra.AbsoluteLayout());
        add(jPanel1, new org.netbeans.lib.awtextra.AbsoluteConstraints(0, 0, 400, 300));

        pack();
        setLocationRelativeTo(null);
    }// </editor-fold>                        

    /**
     * Exit the Application
     */
    private void exitForm(java.awt.event.WindowEvent evt) {                          
        System.exit(0);
    }                         

    /**
     * @param args the command line arguments
     */
    public static void main(String args[]) {
        java.awt.EventQueue.invokeLater(new Runnable() {
            public void run() {
                Frame f = new Boot();

                f.setVisible(true);

                //  this.add(kanvas);
            }
        });
    }


    // Variables declaration - do not modify                     
    private javax.swing.JPanel jPanel1;
    // End of variables declaration                   
}