Progess bar is not showing until the task is completed

Hi,
when some button press, in button action i am using "progessBar.setVisible(true)" as fist statement then i am processing some XML files.
according to above scenario the progress Bar need to visible first then processing XML files later
but after processing the XML files the progress bar is showing.
i want to progressbar visible fist then xml files process start
this is the sample code
private void addComp(java.awt.event.ActionEvent evt) ------------------------------------------------>here button action start
 progressBar.setVisible(true);----------------------------------------------------------------------->here i am make progressBar visible
 progressBar.setVisible(true);
 buttoncount++;
 if(buttoncount>=2)
 jComboBox1.removeAllItems();
 jComboBox2.removeAllItems();
 jComboBox1.addItem(" ---select---");
 jComboBox2.addItem(" ---select---");
 System.out.println("enter into action");
 try {
 File dir = new File("C:\\Xmlfiles");----------------------------------------->from here XML processing starts
 System.out.println("time in nano :"+System.nanoTime());
 filesList = dir.list();
 java.lang.Process p = null;
 Runtime rt = Runtime.getRuntime();
 for (int i = 0; i < filesList.length; i++)
 String fname = filesList;
String[] s = fname.split("\\.");
String s1 = s[0];
if (fname.endsWith(".xml"))
String fname1 = dir.toString() + "\\" + fname;
String command =
"cmd /c pari_api_client.bat -s localhost -u admin -p Pari0426 -if " +
fname1 +" -of C:\\Responses\\" + s1 + "xmlResp.xml";
String[] st=null;
File wdir=new File("C:\\apiDist\\bin");
p = rt.exec(command, st, wdir);
requests++;
Thread.sleep(1500);
status=true;
File dir1 = new File("C:\\Responses");
String[] filesList = dir1.list();
int responses=filesList.length;
System.out.println("Lenght :"+responses);
System.out.println("Faild Xml files :");
int unSuccessfulXmls=0;
for(int i=0;i<filesList.length;i++)
if(filesList[i].endsWith(".xml"))
String fname=dir1.toString()+"\\"+filesList[i];
DocumentBuilderFactory docBuilderFactory = DocumentBuilderFactory.newInstance();
DocumentBuilder docBuilder=docBuilderFactory.newDocumentBuilder();
Document doc=docBuilder.parse(fname);
org.w3c.dom.Element root=doc.getDocumentElement();
org.w3c.dom.Element elm=XMLUtil.getElementByTagName(root,"ErrorList");
org.w3c.dom.Element warnElm=XMLUtil.getElementByTagName(root,"WarnList");
String fname1=filesList[i];
if(elm!=null||warnElm!=null)
System.out.println(fname1);
jComboBox2.addItem(fname1);
else
System.out.println(fname1);
jComboBox1.addItem(fname1);
} catch (Exception e) {
e.printStackTrace();
System.out.println("file processing over");
after processing the XML files the progressBar is visible
what is the problem?? where i am missing
please help meeee
Thanks in advance,
Nagaraju.
Edited by: uppala on Dec 23, 2009 11:00 AM
Edited by: uppala on Dec 23, 2009 11:31 AM

Your code is execting on the Event Dispatch Thread (EDT) which means the GUI can't repaint itself until the long running task finishes.
Read the JProgressBar API and follow the link to the Swing tutorial on "How to Use Progress Bars" for a working example. While in the tutorial you should also read the section on "Concurrency" which explains about the EDT.

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