3 issues on Apple Mac, program runs fine on Windows

Hello,
some users have trouble running my app on their apple macintosh machines. i don't have one myself, so it's pretty hard for me to find what is causing the issues, i'd appreciate your help therefore.
1) frame not receiving close notification
public class Trakker_Main extends JFrame
     public Trakker_Main()
          // snipped some code
          addWindowListener(new java.awt.event.WindowAdapter()
              public void windowClosing(WindowEvent winEvt)
                   doShutdown();
}on my windows pc, "doShutdown" is called when i press ALT+F4 or the close button in the top right corner.
on a users mac pc, it is not called when he presses the "apple + Q" combination. why?
2) (drag&)drop not working
i have a JTable and enable drop support for files from windows explorer / apple "finder" with this call:
fileTable.setTransferHandler(new FSTransfer());
public class FSTransfer extends TransferHandler
         public boolean importData(JComponent comp, Transferable t)
              Util.log("DEBUG: importData called", Level.SEVERE);
               // Make sure we have the right starting points
               if (!(comp instanceof JTable))
                    return false;
              Util.log("DEBUG: importData called 2", Level.SEVERE);
               if (!t.isDataFlavorSupported(DataFlavor.javaFileListFlavor))
                    return false;
              Util.log("DEBUG: importData called 3", Level.SEVERE);
               try
                    @SuppressWarnings("unchecked")
                    List<File> data = (List<File>)t.getTransferData(DataFlavor.javaFileListFlavor);
                    File[] files = (File[])data.toArray();
                   Util.log("DEBUG: importData files: " + files.length, Level.SEVERE);
                    Thread thread = new Thread(new FileAddThread(files));
                   thread.start();
                   Util.log("DEBUG: importData thread started", Level.SEVERE);
                   setStatusText("Adding, please wait...");
                    return true;
               catch (Exception ex)
                    Util.log("DRAGNDROP ERROR: " + ex.getMessage(), Level.SEVERE);
               return false;
          // we only support file lists
          public boolean canImport(JComponent comp, DataFlavor[] transferFlavors)
              Util.log("DEBUG: canImport called 1", Level.SEVERE);
               if (comp instanceof JTable)
                   Util.log("DEBUG: canImport called 2", Level.SEVERE);
                    for (int i = 0; i < transferFlavors.length; i++)
                         if (!transferFlavors.equals(DataFlavor.javaFileListFlavor))
                              return false;
                    return true;
               return false;
          static final long serialVersionUID = 0;
dropping files in windows works perfectly, but not on the mac. what am i doing wrong?
3) table sorting not possible in java 1.5
in java 1.6 (available on windows) i can easily sort tables with:          TableRowSorter<FileTableModel> sorter = new TableRowSorter<FileTableModel>();
          fileTable.setRowSorter( sorter );
          sorter.setModel( fileTableModel );
unfortunately there is no java1.6 on mac, only 1.5. do i need to implement my own sorting algorythm now?
thank you for your help & hints.
robert

1. It's been awhile since I've used it, but you might want to check out Apple's [OSXAdapter class|http://developer.apple.com/samplecode/OSXAdapter/index.html] to handle OSX-specific stuff. It provides a means to do Mac-specific stuff (single menubar, Preferences/About in the application menu, etc.). It also supports specifying a "quit" operation, which may be what you're looking for. Best of all, it has a "dynamic" implementation so that you can use it without directly using any Apple-specific Java classes and thus breaking cross-platform compatibility.
3. Check out this for a way to make JTables sortable.

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