CODEWITHSUNDEEP
javadatabaseswingsqlitenullpointerexception
CodeHead
CodeHead

Reputation: 197

Java swing , Error Retrieving Image From Database using Eclipse

Error: java.lang.NullPointerException at javax.swing.ImageIcon.(Unknown Source) at Show$2.actionPerformed(Show.java:79)

I think the problem is occuring in BufferedImage , is there any other option to retrieve image(Blob) form Database . I am using Sqlite database .

Here Goes The Code : 

public class Show extends JFrame {

private JPanel contentPane;
private JTextField id;
BufferedImage bufImg = null;
JLabel img=null;
InputStream in=null;
ImageIcon imgs=null;
/**
 * Launch the application.
 */
public static void main(String[] args) {
    EventQueue.invokeLater(new Runnable() {
        public void run() {
            try {
                Show frame = new Show();
                frame.setVisible(true);
            } catch (Exception e) {
                e.printStackTrace();
            }
        }
    });
}

/**
 * Create the frame.
 */
Connection con=null;
public Show() {
    con=dB.Connect();

    setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    setBounds(100, 100, 588, 432);
    contentPane = new JPanel();
    contentPane.setBorder(new EmptyBorder(5, 5, 5, 5));
    setContentPane(contentPane);
    contentPane.setLayout(null);

    id = new JTextField();
    id.setBounds(158, 23, 86, 20);
    contentPane.add(id);
    id.setColumns(10);

    JButton show = new JButton("New button");
    show.addActionListener(new ActionListener() {
        public void actionPerformed(ActionEvent e) {
            try{
                //String iid=null;
                //iid="10";
                //iid=id.getText().toString();
                String q="select image from image where id='"+id.getText()+"'";

                PreparedStatement ps=con.prepareStatement(q);
                //ps.setString(1, id.getText().trim());
                //ps.executeQuery();
                ResultSet rs=ps.executeQuery(); 

                while (rs.next()) {
                    in= rs.getBinaryStream("image");
                    bufImg = ImageIO.read(in);
                    img.setIcon(new ImageIcon(bufImg));// Console shows the error is in this line 
                }
                rs.close();
                ps.close();

                }catch(Exception c)
                {
                    c.printStackTrace();
                }
        }
    });
    show.setBounds(302, 22, 89, 23);
    contentPane.add(show);

    img = new JLabel("");
    img.setBounds(151, 99, 325, 284);
    contentPane.add(img);
}

}

Upvotes: 1

Views: 147

Answers (1)

NitrogenReaction
NitrogenReaction

Reputation: 336

It appears as though the data format of the image is not recognized(This is the only time ImageIO returns null). However, as the image is a supported format (PNG), this is a very bizarre occurrence. I was able to find a PNG loading bug on the Oracle bug-tracker, however the bug was marked as resolved in 2006.

My best suggestion is to try using a 3rd party image library such as Commons Imaging, Sixlegs, or numerous others.

Upvotes: 1

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