Memory Leak in Swing.

Question

Hi!
I have Real time application(JDK1.3). After each 30 sec it brings data from backend &puts into JTable.
But it works only for 6 to 8 hours. After that it gives error
in JVM.dll.
I'm using 3 threads. Main code is something like this.
public class Main extends Thread{
public void run(){
while(true)
try{
Testtable.Update();
Thread.sleep(30000);
}catch(InterruptedException e)
{ System.out.println("error occured");}
TestTable is a public class which extends AbstractTableModel. This is a inner class of Main class.
I have checked memory usage of java.exe. It increases
usage after sometime.
How to detect memory leak? Do have to do changes in my code? "vector" usage is more in this program.
Thanks,
Sujata.

Answer 1

Hi,
For cellrendering I have following code.
public class MultiLineHeaderRenderer extends JList implements TableCellRenderer{
public MultiLineHeaderRenderer() {
try{
setOpaque(true);
setForeground(UIManager.getColor("TableHeader.foreground"));
setBackground(UIManager.getColor("TableHeader.background"));
setBorder(UIManager.getBorder("TableHeader.cellBorder"));
ListCellRenderer renderer = getCellRenderer();
((JLabel)renderer).setHorizontalAlignment(JLabel.CENTER);
setCellRenderer(renderer);
}catch ( Exception err){
TeCILog.logTrace( this, "Failed to construct MultiLineHeaderRenderer." );
TeCILog.logError( this, err );
public Component getTableCellRendererComponent(JTable table, Object value,boolean isSelected, boolean hasFocus, int row, int column)
setFont(table.getFont());
String str = (value == null) ? "" : value.toString();
BufferedReader br = new BufferedReader(new StringReader(str));
String line;
Vector v = new Vector();
try {
while ((line = br.readLine()) != null)
v.addElement(line);
br.close();
}catch (IOException ex) {
ex.printStackTrace();
} catch(Exception err){
System.out.println("error" + err );
setListData(v);
return this;
private ListCellRenderer renderer = null;
Does this is causing leakage?
Sujata