JTree serialization problem

Hi There,
I Have a JTree object, with DefaultTreeModel, and DefaultMutableTreeNodes that contain objects of a class I programmed (which is serialized).
I want to be able to write all tree data to a local disk, and read it afterwards.
I managed to write the JTree object, but not to read it.
I haven't managed even to write the tree model.
Idea's anyone ?
Yuval
(I'm using ObjectInputStream and FileInputStream for reading, and ObjectOutputStream and FileOutputStream for writing).

Cross-post: http://forum.java.sun.com/thread.jsp?thread=327285&forum=31&message=1329704

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import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
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in this object creation is not happening
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Big thanks to anybodey who will help.
regards floW

I'll tel u the whole story then, my problem is as follows:
public class BounceThread{
   public static void main(String[] args)   {
      JFrame ramka = new BounceFrame();
         ramka.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
         ramka.setVisible(true);
class BounceFrame extends JFrame{
public BounceFrame()
      setSize(DEFAULT_WIDTH, DEFAULT_HEIGHT);
      setTitle("MiniGolf v 1.0");
      panel = new BallPanel(); // this contains maps made with 2D objects
      panel.setBackground(Color.green);
      panel.setVisible(panel.czy_widać_panel());
      add(panel, BorderLayout.CENTER);
// I add a menu bar, that starts a net game:
JMenuBar pasekMenu = new JMenuBar();
          setJMenuBar(pasekMenu);
          JMenu menuGra = new JMenu("Game");
       // and so on... and finaly I add an option:
          menuGame_Nowa.add(new
                    AbstractAction("Net game")
                         public void actionPerformed(ActionEvent event)
                              net_game(panel);
// here i write my net_game method:
public void net_game(BallPanel aPanel)
     //here, i make an Client object, and connect him with my server
     client = new mgClient(panel);
     client.join();
     // I give panel as a paramete, cause I cant think of another way of leting my server to uce it's (panels) methods
     // If I join only a name of my client, then how can I change the panel in my BounceFrame from the Clients method
     // "shouted" by the server!? It has to be a field in the client's object.
     // Is there any other way out!?
// Class BouceFrame holds the panel as a field:
private mgClient client;
private BallPanel panel;
//and so on...
}and that's the real problem I'm facing here. Is there any solution!? I think, that making a Client's field out of my panel is the only way ot. And that means I need those 2D objects serialized... :(
Please help if u can.
Regards floW

[WL6.1 SP2] RMI and Serialization problems

Greetings. I've got a strange question.
I have a rather large object graph that's produced by an EJB. This
object graph is then serialized and sent across the network to a waiting
client, or is passed to the web tier.
The object graph is of variable size, but huge in any case - some
examples are 10 megs in size when serialized to disk.
The big problem is that it takes a lot of ram to serialize this object
to push it over the network. Now, this wouldn't be a big problem (because
objects are not requested very often), but for the fact that weblogic
doesn't seem to release the memory for these objects after the serialization
takes place.
Is there some way to make sure that the object stream is closed after
the object is sent, so the memory can be GC'd for other processes? We're
currently giving the server about 600 Megs of ram max for the heap (the
server is a ES40 dual), and the server can die in a matter of hours.
Would SP3 help things at all?
Is there some way to force memory cleanup?
Thanks!
-Jim Nemesh

"Jim Nemesh" <[email protected]> writes:
The big problem is that it takes a lot of ram to serialize this object
to push it over the network. Now, this wouldn't be a big problem (because
objects are not requested very often), but for the fact that weblogic
doesn't seem to release the memory for these objects after the serialization
takes place.This sounds like a bug, although if you leave any reference to the
object it will not get GC'd. Are nulling out all your references after
you are done with the object?
Is there some way to make sure that the object stream is closed after
the object is sent, so the memory can be GC'd for other processes? We're
currently giving the server about 600 Megs of ram max for the heap (the
server is a ES40 dual), and the server can die in a matter of hours.If the stream is not being closed then its a bug.
Would SP3 help things at all?
Is there some way to force memory cleanup?Garbage collection should do this.
andy

JTree scrollbar problem - can't scroll back to top when some nodes hidden

I have a problem which I cannot resolve: I have a JTree which has had 88 rows added to it, and which then has 15 or so rows set to be not visible; when I then scroll to the bottom of the pane I am unable to scroll all the way back to the top using either the scroll button at the top of the bar or the mouse scroll wheel although I can drag the knob to get to the top; using the button or wheel, the scrolling stops somewhat short of the top; via testing I've found that the AdjustmentEvent is not fired when it reaches that point. Anyone seen this before and/or know a way around it?
Thanks in advance,
Mike

MikeAuerbach267 wrote:
It turns out that my problem was due to the fact that I am using my own TreeCellRenderer which makes invisible some nodes via user option but doesn't reload the tree; hence the confusion as to the scrollbar size. I now correctly reload after user option has changed rather than render nodes invisible and all is fine. Which reinforces Andrew's view in reply #1 that a 'vague waving about of hands' does not allow the forum members to help.

JTree, strange problem

I created a JTree on top of a DefaultMutatableTreeNode by using the constructor JTree(TreeNode root)
I tried removing all leaf nodes of the model, using node.removeFromParent(). And unsurprisingly the UI is automatically updated.
After that, i reinsert new leaf nodes(they are new instances having new physical address) into the model, using parent.add(node). And unsurprisingly, the UI is automatically updated. The JTree looks powerful at the moment, i am quite satisfied with it.
However the nightmare comes, when i click on the leaf nodes on the UI and the getLastSelectedPathCompoent() mystically returned the already-removed leaf nodes but not the newly-inserted leaf nodes.
I tried debugging for a couple of hours, but failed! I think i am doing something really wrong :( Anyone help me out? Thanks a lot!

problem solved:)
solved by calling the updateUI() for the removal operation.....

JTree renderer problem

I have listed below a shor example.
What I need is a method to do each cell to be as wide as the tree is (see the red border line), even if I resize the window. And ofcourse, the tree should keep a minimum width so every cell is fully shown.
I'll be waiting for your answers. Thanks.
import javax.swing.*;
import javax.swing.tree.*;
import java.awt.*;
public class TreeExample extends JFrame {
    public TreeExample() {
        setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE);
        getContentPane().add(new JScrollPane(new SomeTree()));
        pack();
    public static void main(String[] args) {
       SwingUtilities.invokeLater(new Runnable() {
            public void run() {
                new TreeExample().setVisible(true);
class SomeTree extends JTree {
    public SomeTree() {
        DefaultMutableTreeNode root = new DefaultMutableTreeNode("root");
        String str = "***";
        for (int i = 0; i < 10; i++) {
            root.add(new DefaultMutableTreeNode(str));
            str += "***";
        setModel(new DefaultTreeModel(root));
        setCellRenderer(new SomeCellRenderer());
        setBorder(BorderFactory.createLineBorder(Color.RED));
class SomeCellRenderer extends JLabel implements TreeCellRenderer {
    public Component getTreeCellRendererComponent(JTree tree, Object value,
                                                      boolean selected, boolean expanded,
                                                      boolean leaf, int row,
                                                      boolean hasFocus) {
        setOpaque(true);
        setText(value.toString());
        setBackground(Color.LIGHT_GRAY);
        return this;
}

The only problem i can figure is maybe the layout. Flowlayout is squeezing the size of the buttons so that they can appear in the little area that they do get. If you use borderlayout instead of the flowlayout, it may solve your problem. If that also doesn't work then set the minimum sizes of the labels.

JTree serialization problem

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