JFileChooser issue - open at the back of the browser

Question

Hello All,
I have a strange issue using JFileChooser. I have implemented a WebApplication with a browse option to a folder(not files). For this JFileChooser has been used. Strangely when I click on "Browse" button, the controller calls the JAVA class, and the dialog opens behind the browser (only for the first time). and next time onwards it opens on the browser only. Here is the code i have written:
import java.io.IOException;
import java.io.PrintWriter;
import java.util.List;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.awt.Container;
import java.awt.Point;
import java.awt.Frame;
import java.io.File;
import javax.swing.JFileChooser;
import javax.swing.JFrame;
import javax.swing.UIManager;
import org.json.JSONException;
//few more imports for SynchronizeService, and for JSON
public class FolderChooser1 extends SynchronizeService {
     private String selectedFolder = "";
     static final String RETURN_TYPE = "text/json";
     private PrintWriter out;
     private HttpServletRequest request;
     private MessageJSON folderNameJSON;
     int folderCounter = 0;
     String saveSelectedFolder = "";
                static String selectedDirectory = "";
@Override
     public List service(Connection conn) throws IOException {
          HttpServletResponse response = null;
          List<Object> list = null;
          try {
                    super.service(conn);
                    list = serviceClientInput(conn);
                    request = conn.getRequest();
                    response = conn.getResponse();
                    response.setContentType(RETURN_TYPE);
                    out = response.getWriter();
                    folderCounter = Integer.parseInt(request.getParameter("folderCounter"));
                    if(request.getParameter("saveSelectedFolder")!=null)
                         saveSelectedFolder = request.getParameter("saveSelectedFolder");
                    System.out.println("**** Save selected folder:"+saveSelectedFolder);
                    if (folderCounter > 0)
                         System.out.println("**** Folder Count:"+folderCounter);
                         //dialog(new JFrame(), "Browse For Folder", new File("/"+saveSelectedFolder));
                         dialog(new JFrame(),"Browse For Folder");
                    else
                         System.out.println("** In else");                         
                         //dialog(new JFrame(), "Browse For Folder", new File(System.getProperty("user.home")+ "/Desktop"));
                         dialog(new JFrame(),"Browse For Folder");
                    if (selectedDirectory != "") {
                    folderNameJSON = new MessageJSON();
                    folderNameJSON.setMessage(selectedDirectory);
                    out.write(folderNameJSON.toJSONString());
               } catch (JSONException je) {
                    System.out.println("****");
                    je.printStackTrace();
               } catch (Exception e) {
                    System.out.println("*********");
                    e.printStackTrace();
          return list;
                public static void dialog(Container frame, String title) {
          while (!(frame instanceof Frame)) {
               frame = frame.getParent();               
          try {
               UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
          } catch (Exception exception) {
               exception.printStackTrace();
          JFileChooser dirChooser = new JFileChooser();
          dirChooser.setFileSelectionMode(JFileChooser.DIRECTORIES_ONLY);
          if (selectedDirectory!=null | selectedDirectory==""){
               dirChooser.setCurrentDirectory(new File(selectedDirectory));
          dirChooser.setDialogType(JFileChooser.OPEN_DIALOG);
          dirChooser.setDialogTitle(title);
          dirChooser.setMultiSelectionEnabled(false);
          dirChooser.setAcceptAllFileFilterUsed(false);
          dirChooser.setEnabled(true);
          dirChooser.setVisible(true);
          // Display the folder chooser dialog:
          int returnVal = dirChooser.showDialog(frame, "SELECT");
          // If a folder was chosen:
          if (returnVal == JFileChooser.APPROVE_OPTION) {
               System.out.println("Is selected a directory:"+dirChooser.getSelectedFile().isDirectory());
               selectedDirectory = dirChooser.getSelectedFile().getAbsolutePath();
               //selectedDirectory = dirChooser.getCurrentDirectory().getAbsolutePath();               
               System.out.println("**** selected Directory:"+selectedDirectory);
          }else if (returnVal == JFileChooser.CANCEL_OPTION) {               
               selectedDirectory = selectedDirectory;
}So please let me know where it is going wrong.
Thank you.

Answer 1

showDialog(frame) didnot work for me.
Sorry, I have to resolve it as earlier as possible, hence I took all the possible ways to find a solution and posted the query in other forums also.
Kindly help.