Coding Swing Applications with Large JDBC ResultSets
Hi,
Does anyone know where I can find information regarding efficient ways to code Swing UI's with large JDBC result sets. I have been using JTextArea but my application seems to constantly run out of memory when I encounter a large result set. Also, any information regarding threading and if running database queries should be done entirely off the event thread vs SwingUtilities.invokeLater() would be of tremendous help.
Thanks,
John Meah
If doing operations in the awt thread starts to impair the performance of your app, then create a new class that implements Runnable, and do this:
Thread t = new Thread (new yourRunnable());
t.start();
t should have lower priority than the AWT thread.
As far as large result sets, it is a fairly universal problem. My recommendation is that you arbitrarily impose a limit on how many of the records returned are displayed, like maybe 25 records. This should fix your problem
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overridden method finalize() I also call the flush() method.
if(this.icon != null){
this.icon.getImage().flush();
this.icon = null;
}The surviving objects still increase?! On the page of SUN they
submitted a bug. But this is set on closed/fixed.
(http://bugs.sun.com/bugdatabase/view_bug.do?bug_id=4014323)
What am I doing wrong? I also use the byte[] constructor on creating the icon and
my java version is 1.5.0_10.If in your JFrame u have placed your image, before invoke the dispose()
method put explicitly the image pointer to null and deregister all listener
you have added to any componentI implemented your suggest and after starting a long time test, in one hour there gathered aprox. 500 surviving generations. I attach a snapshot and the java file ( http://www.box.net/public/eqznamrazd ). The used heap size swings between 3MB and 5MB. I guess this wont kill so quickly the application but anyway there is something wrong!
Even properly closed streams, database connections etc.. Really despairing. Could one take a look to the java source?
some snippets bellow:
private class MyImageIcon extends ImageIcon {
public MyImageIcon(Image img){
super(img);
public void removeImage(Image anImage){
tracker.removeImage(anImage);
private class DetailDialog extends javax.swing.JFrame {
private String personnr;
private MyImageIcon icon;
public DetailDialog(String personnr,MyImageIcon icon){
this.personnr = personnr;
this.icon = icon;
public void dispose() {
if(icon != null){
icon.removeImage(icon.getImage());
icon.getImage().flush();
icon = null;
super.dispose();
private class Person extends Object {
private MyImageIcon icon;
private String number;
private DetailDialog detailDialog;
protected void destroy() {
if(icon!=null){
icon.removeImage(icon.getImage());
icon.getImage().flush();
icon = null;
if(detailDialog!=null){
detailDialog.dispose();
private Image LoadImageFromDB(String personnr){
Image img = null;
String filename = personnr + ".jpg";
Connection con = getMysqlConnection();
Statement stmt;
ResultSet rs;
try {
stmt = con.createStatement();
String query = "select * from personImage where image='"+filename+"'";
rs=stmt.executeQuery(query);
if(rs.next()){
int len=rs.getInt(2);
byte [] b=new byte[len];
InputStream in = rs.getBinaryStream(3);
try {
in.read(b);
in.close();
img =
java.awt.Toolkit.getDefaultToolkit().createImage(b);
} catch (IOException e) {
e.printStackTrace();
rs.close();
rs = null;
stmt.close();
stmt = null;
con.close();
con = null;
} catch (SQLException e) {
e.printStackTrace();
return img;
public void random(){
java.sql.ResultSet rs = null;
java.sql.Statement stmt=null;
java.sql.Connection con = getSybaseConnection();
try {
try {
stmt = con.createStatement();
rs = stmt.executeQuery(randomquery);
while(rs.next()){
Person person = new Person();
person.number = rs.getString("PersonNr");
Image img = LoadImageFromDB(person.number);
if(img !=null){
MyImageIcon ico = new MyImageIcon(img);
person.icon = ico;
person.detailDialog = new
DetailDialog(person.number,person.icon);
personList.add(person);
System.out.println("Container size: " +
personList.size());
counter++;
if(counter%20 == 0){
for(Person p : personList){
p.destroy();
personList.clear();
System.gc();//no need, but I force for this example
System.out.println("Container cleared, size: " +
personList.size());
} catch (SQLException ex) {
ex.printStackTrace();
}finally{
if(rs != null){
rs.close();
}if(stmt != null){
stmt.close();
}if(con != null){
con.close();
} catch (SQLException ex) {
ex.printStackTrace();
} -
PosgreSQL LAN-Based Swing Application
is it possible to create a lan-based swing application with database connectivity?
how?
thanxxflor.jerico.m wrote:
is it possible to create a lan-based swing application with database connectivity?
how?
thanxxYou mean swing application(s) on various hosts pointing to same database ?
http://jdbc.postgresql.org/doc.html
check out jdbc url
jdbc:postgresql://host/database
jdbc:postgresql://host:port/database -
BackGround picture for a Swing application??
hi,
once I got a nice idea while watching some webpages. we can give a background picture for a webpage in <body> tag?
I want to do same thing for any Swing application. Currently I am working on that issue. Any suggestions are welcome!!
santhoshHi everybody!
Finally I got it. now Using this We can enable background for any swing application.
the complete code is shown here. If you have any problems regarding this code, please mail to [email protected]
/******************************[TexturedImageIcon.java]***********************/
import java.net.*;
import java.awt.*;
import java.awt.event.*;
import java.awt.geom.*;
import java.awt.image.*;
import javax.swing.*;
/* this is used to generate a tiled image from a given image file.*/
public class TexturedImageIcon extends ImageIcon
private Dimension size = new Dimension(10, 10);
BufferedImage bimg1,bimg;
Graphics2D g2;
ComponentListener cl = new ComponentAdapter(){
public void componentResized(ComponentEvent ce){
Component c = (Component)ce.getSource();
size = c.getSize();
createImage();
public void setImage(String filename){
super.setImage(new ImageIcon(filename).getImage());
bimg1=null;
createImage();
public TexturedImageIcon(Component comp, Image img){
super(img);
addListener(comp);
public TexturedImageIcon(Component comp, String filename){
super(filename);
addListener(comp);
public TexturedImageIcon(Component comp, URL url){
super(url);
addListener(comp);
private void addListener(Component comp){
comp.addComponentListener(cl);
private void createImage(){
bimg = new BufferedImage(size.width, size.height, BufferedImage.TYPE_INT_RGB);
g2 = bimg.createGraphics();
Rectangle2D rect = new Rectangle2D.Float(0,0,size.width-1, size.height-1);
Rectangle2D tr = new Rectangle2D.Double(0,0,super.getIconWidth(), super.getIconHeight());
if(bimg1==null){
bimg1 = new BufferedImage(super.getIconWidth(), super.getIconHeight(), BufferedImage.TYPE_INT_RGB);
Graphics2D g = bimg1.createGraphics();
g.drawImage(super.getImage(), null, null);
TexturePaint tp = new TexturePaint(bimg1, tr);
g2.setPaint(tp);
g2.fill(rect);
public int getIconWidth(){ return size.width; }
public int getIconHeight(){ return size.height; }
public Image getImage(){
System.out.println("asked");
return bimg;
public void paintIcon(Component c, Graphics g, int x, int y){
Graphics2D g2d =(Graphics2D)g;
g2d.drawImage(bimg, null, null);
public static void main(String[] args){
JFrame f = new JFrame();
f.setSize(300,300);
JLabel label = new JLabel();
label.setBackground(Color.white);
label.setBorder(BorderFactory.createRaisedBevelBorder());
label.setIcon(new TexturedImageIcon(label, "world2.gif"));
f.getContentPane().setLayout(new BorderLayout());
f.getContentPane().add(label, BorderLayout.CENTER);
f.show();
/*********************************[JFCUtils.java]************************/
/*The main logic to enable background picture lies in this class*/
public class JFCUtils{
public static ContainerListener cl = new ContainerAdapter(){
public void componentAdded(ContainerEvent ce){
JComponent child = (JComponent)ce.getChild();
child.setOpaque(false);
child.addContainerListener(this);
addlisteners(child);
public static TexturedImageIcon enableBackGround(JFrame f, String filename){
((JPanel)f.getContentPane()).setOpaque(false);
JLayeredPane lp = f.getLayeredPane();
JLabel label = new JLabel();
TexturedImageIcon icon = new TexturedImageIcon(label, filename);
label.setIcon(icon);
JPanel panel = new JPanel(new BorderLayout());
panel.add(label, BorderLayout.CENTER);
lp.add(panel, new Integer(Integer.MIN_VALUE));
Dimension screen = Toolkit.getDefaultToolkit().getScreenSize();
panel.setBounds(0, 0, screen.width,screen.height);
addlisteners((JComponent)f.getContentPane());
return icon;
private static void addlisteners(Component c){
c.toString();
if(c instanceof JComponent) ((JComponent)c).setOpaque(false);
if(c instanceof Container){
Container ct = (Container)c;
ct.addContainerListener(cl);
for(int i=0; i<ct.getComponentCount(); i++){ //recursivly make all subcomponents transparent
Component child = (Component)ct.getComponent(i);
addlisteners(child);
public static void main(String[] args){
JFrame f = new JFrame();
enableBackGround(f, "bg.jpg");
JButton b = new JButton("fdfdfdfd");
f.getContentPane().add(b, BorderLayout.NORTH);
f.setSize(300,300);
f.show();
/*************************************[UserDialog.java]**************************/
//to check how a swing application with background looks like
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import javax.swing.event.*;
public class UserDialog extends JDialog
JPanel contents = (JPanel)getContentPane();
JTextField shortField = new JTextField(20);
JTextField nameField = new JTextField(20);
JTextField emailField = new JTextField(20);
JTextField smtpServerField = new JTextField(20);
JTextField pwdField = new JPasswordField(20);
JTextField pwdField1 = new JPasswordField(20);
boolean okay = false;
public UserDialog(JFrame owner){
super(owner, "New User Details", true);
initComponents();
pack();
setResizable(false);
public UserDialog(JDialog owner){
super(owner, "New User Details", true);
initComponents();
pack();
setResizable(false);
private void initComponents(){
JPanel west = new JPanel(new GridLayout(0, 1));
west.add(new JLabel("Short Name"));
west.add(new JLabel("Full Name"));
west.add(new JLabel("Email"));
west.add(new JLabel("SMTP Server"));
west.add(new JLabel("Password"));
west.add(new JLabel("Confirm Password"));
JPanel east = new JPanel(new GridLayout(0, 1));
east.add(shortField);
east.add(nameField);
east.add(emailField);
east.add(smtpServerField);
east.add(pwdField);
east.add(pwdField1);
JPanel south = new JPanel();
JButton ok = new JButton("Ok");
JButton cancel = new JButton("Cancel");
south.add(ok);
south.add(cancel);
contents.setBorder(JFCUtils.border);
contents.setLayout(new BorderLayout(10, 10));
contents.add(west, BorderLayout.WEST);
contents.add(east, BorderLayout.EAST);
contents.add(south, BorderLayout.SOUTH);
ActionListener al = new ActionListener(){
public void actionPerformed(ActionEvent ae){
okay = ae.getActionCommand().equals("Ok");
setVisible(false);
ok.addActionListener(al);
cancel.addActionListener(al);
private void clearFields(){
shortField.setText("");
nameField.setText("");
emailField.setText("");
smtpServerField.setText("");
pwdField.setText("");
pwdField1.setText("");
public User getUser(){
clearFields();
okay = false;
show();
if(okay) return new User(shortField.getText(), nameField.getText(), emailField.getText(), smtpServerField.getText(), pwdField.getText());
else return null;
public static void main(String[] args){
Dialog dlg = new UserDialog();
TexturedImageIcon ticon = JFCUtils.enableBackGround(f, "bg.jpg");.show();
//we can change the background picture by calling ticon.setImage(...) at runtime.
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