Problem with JTree while expanding/collapsing a node

Hi,
I'm using a JTree for displaying the file system.
Here, i want that whenever a node get expanded,
it should show the latest files/directories under that node.
Now, what i'm doing is, getting all the files/dir's using files.listFiles(),
under that node and then creating a new node and adding it to parent (all in expand() method).
But, now the problem is, while doing this whenever the parent node get expanded its adding all the latest files/dirs into the previous instance
resulting the same file/dir is displaying twice,thrice.. and so on, as that node is expanded and collapsed.
i tried removeAllChildren() in collapse() method but then that node is notexpanding at all .
Can anybody help me please...
i got stuck b'coz of this only.
Thanks...

Now what i'm doing is every time expand() get called,
i'm comparing all the children of that node in the
current instance with all the children present in the
file system (because there is a possibility that some
file/dir may be added or deleted)
is this the right wy or not?it certainly is not wrong, but as usual, there is more than 1 way to implement this...
b'coz right now i'm getting all the files/dirs that
are newly added but facing some problem if somebody
deletes a file/dir.
i'm still trying to get the solutionthen you should not just compare all the children of the node with the files/dirs but also the other way round. compare the files/dirs with the children to determine if the file/dir still exists and if not remove the node.
or you could check if the file which a node represents exists and if not remove the node.
thomas

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Problem with JTree in expanded mode?

Hi I have a JTree and I have added few nodes to it. Now when i run my program it is displaying all the nodes in the expanded mode. but at some point of time i need to add few more nodes. when i am am adding nodes to the root node when the tree in expanded mode the newly added nodes are not visible. They are not getting added. what could be the problem? how do i add nodes to the tree when in expanded mode as well as remove few nodes when in expanded mode?
My code is as follows.
import java.awt.BorderLayout;
import javax.swing.JDesktopPane;
import javax.swing.JFrame;
import javax.swing.JScrollPane;
import javax.swing.JTree;
import javax.swing.tree.DefaultMutableTreeNode;
public class Main extends JFrame{
     private DefaultMutableTreeNode top;
     public JTree mainTree;
     public Main(){
          super();
          JDesktopPane dp=new JDesktopPane();
          dp.setLayout(new BorderLayout());
          top =new DefaultMutableTreeNode("All Active Nodes");
          mainTree=new JTree(top);
          JScrollPane mtsp=new JScrollPane(mainTree);
          dp.add(mtsp,BorderLayout.CENTER);
          this.setContentPane(dp);
          this.setDefaultCloseOperation(DISPOSE_ON_CLOSE);
          this.setSize(300, 550);
          this.setVisible(true);
     public static void main(String[]args)throws Exception{
          Main as=new Main();
          DefaultMutableTreeNode top=as.getTop();
          DefaultMutableTreeNode node=new DefaultMutableTreeNode("murali");
          top.add(node);
          as.mainTree.expandRow(0);
          Thread.sleep(10000);
          System.out.println("there");
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      * @return the top
     public DefaultMutableTreeNode getTop() {
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}

I got the solution. The solution is to invoke nodesWereInserted(TreeNode node, int[] childIndices) this on treeModel after adding nodes are removing nodes.

JTree with XML content expand/collapse problem

Hello all,
I'm having this very weird problem with a JTree I use to display the contents of an XML file. I use the DOM parser (and not JDOM since I want the application to run as an applet as well, and don't want to have any external libraries for the user to download) and have a custom TreeModel and TreeNode implementations to wrap the DOM nodes so that they are displayed by the JTree.
I have also added a popup menu in the tree, for the user to be able to expand/collapse all nodes under the selected one (i.e. a recursive method).
When expandAll is run, everything works fine and the children of the selected node are expanded (and their children and so on).
However, after the expansion when I run the collapseAll function, even though the selected node collapses, when I re-expand it (manually not by expandAll) all of it's children are still fully open! Even if I collapse sub-elements of the node manually and then collapse this node and re-expand it, it "forgets" the state of it's children and shows them fully expanded.
In other words once I use expandAll no matter what I do, the children of this node will be expanded (once I close it and re-open it).
Also after running expandAll the behaviour(!) of the expanded nodes change: i have tree.setToggleClickCount(1); but on the expanded nodes I need to double-click to collapse them.
I believe the problem is related to my implementations of TreeModel and TreeNode but after many-many hours of trying to figure out what's happening I'm desperate... Please help!
Here's my code:
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    protected boolean allowChildren;
    protected Vector children;
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        "Attr",
        "Text",
        "CDATA",
        "EntityRef",
        "Entity",
        "ProcInstr",
        "Comment",
        "Document",
        "DocType",
        "DocFragment",
        "Notation",
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    static final int ATTR_TYPE =      2;
    static final int TEXT_TYPE =      3;
    static final int CDATA_TYPE =     4;
    static final int ENTITYREF_TYPE = 5;
    static final int ENTITY_TYPE =    6;
    static final int PROCINSTR_TYPE = 7;
    static final int COMMENT_TYPE =   8;
    static final int DOCUMENT_TYPE = 9;
    static final int DOCTYPE_TYPE = 10;
    static final int DOCFRAG_TYPE = 11;
    static final int NOTATION_TYPE = 12;
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   static String[] treeElementNames = {
        "node",
// Construct an Adapter node from a DOM node
public XMLTreeNode(org.w3c.dom.Node node) {
    domNode = node;
public String toString(){
       if (domNode.hasAttributes()){
            return domNode.getAttributes().getNamedItem("label").getNodeValue();
       }else return domNode.getNodeName();
public boolean isLeaf(){
       return (this.getChildCount()==0);
boolean treeElement(String elementName) {
      for (int i=0; i<treeElementNames.length; i++) {
        if ( elementName.equals(treeElementNames)) return true;
return false;
public int getChildCount() {
     if (!compress) {
return domNode.getChildNodes().getLength();
int count = 0;
for (int i=0; i<domNode.getChildNodes().getLength(); i++) {
org.w3c.dom.Node node = domNode.getChildNodes().item(i);
if (node.getNodeType() == ELEMENT_TYPE
&& treeElement( node.getNodeName() ))
// Note:
// Have to check for proper type.
// The DOCTYPE element also has the right name
++count;
return count;
public boolean getAllowsChildren() {
     // TODO Auto-generated method stub
     return true;
public Enumeration children() {
     // TODO Auto-generated method stub
     return null;
public TreeNode getParent() {
     // TODO Auto-generated method stub
     return null;
public TreeNode getChildAt(int searchIndex) {
org.w3c.dom.Node node =
domNode.getChildNodes().item(searchIndex);
if (compress) {
// Return Nth displayable node
int elementNodeIndex = 0;
for (int i=0; i<domNode.getChildNodes().getLength(); i++) {
node = domNode.getChildNodes().item(i);
if (node.getNodeType() == ELEMENT_TYPE
&& treeElement( node.getNodeName() )
&& elementNodeIndex++ == searchIndex) {
break;
return new XMLTreeNode(node);
public int getIndex(TreeNode tnode) {
     if (tnode== null) {
          throw new IllegalArgumentException("argument is null");
     XMLTreeNode child=(XMLTreeNode)tnode;
     int count = getChildCount();
     for (int i=0; i<count; i++) {
          XMLTreeNode n = (XMLTreeNode)this.getChildAt(i);
          if (child.domNode == n.domNode) return i;
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public class XMLTreeModel2 extends DefaultTreeModel
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     * This adapter converts the current Document (a DOM) into
     * a JTree model.
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          super(new XMLTreeNode(doc));
          this.document=doc;
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          //System.err.println("Returning root: " +document);
          return new XMLTreeNode(document);
     public boolean isLeaf(Object aNode) {
          return ((XMLTreeNode)aNode).isLeaf();
     public int getChildCount(Object parent) {
          XMLTreeNode node = (XMLTreeNode) parent;
return node.getChildCount();
     public Object getChild(Object parent, int index) {
XMLTreeNode node = (XMLTreeNode) parent;
return node.getChildAt(index);
     public int getIndexOfChild(Object parent, Object child) {
if (parent==null || child==null )
     return -1;
          XMLTreeNode node = (XMLTreeNode) parent;
return node.getIndex((XMLTreeNode) child);
     public void valueForPathChanged(TreePath path, Object newValue) {
// Null. no changes
     public void addTreeModelListener(TreeModelListener listener) {
          if ( listener != null
&& ! listenerList.contains( listener ) ) {
listenerList.addElement( listener );
     public void removeTreeModelListener(TreeModelListener listener) {
          if ( listener != null ) {
listenerList.removeElement( listener );
     public void fireTreeNodesChanged( TreeModelEvent e ) {
Enumeration listeners = listenerList.elements();
while ( listeners.hasMoreElements() ) {
TreeModelListener listener =
(TreeModelListener) listeners.nextElement();
listener.treeNodesChanged( e );
     public void fireTreeNodesInserted( TreeModelEvent e ) {
Enumeration listeners = listenerList.elements();
while ( listeners.hasMoreElements() ) {
TreeModelListener listener =
(TreeModelListener) listeners.nextElement();
listener.treeNodesInserted( e );
     public void fireTreeNodesRemoved( TreeModelEvent e ) {
Enumeration listeners = listenerList.elements();
while ( listeners.hasMoreElements() ) {
TreeModelListener listener =
(TreeModelListener) listeners.nextElement();
listener.treeNodesRemoved( e );
     public void fireTreeStructureChanged( TreeModelEvent e ) {
Enumeration listeners = listenerList.elements();
while ( listeners.hasMoreElements() ) {
TreeModelListener listener =
(TreeModelListener) listeners.nextElement();
listener.treeStructureChanged( e );
The collapseAll, expandAll code (even though I m pretty sure that's not the problem since they work fine on a normal JTree):
    private void collapseAll(TreePath tp){
         if (tp==null) return;
         Object node=tp.getLastPathComponent();
         TreeModel model=tree.getModel();
         if (!model.isLeaf(node)){
              tree.collapsePath(tp);
              for (int i=0;i<model.getChildCount(node);i++){
              //for (int i = node.childCount()-4;i>=0;i--){
                   collapseAll(tp.pathByAddingChild(model.getChild(node,i)));
              tree.collapsePath(tp);
    private void expandAll(TreePath tp){
         if (tp==null) return;
         Object node=tp.getLastPathComponent();
         TreeModel model=tree.getModel();
         if (!model.isLeaf(node)){
              tree.expandPath(tp);
              for (int i=0;i<model.getChildCount(node);i++){
              //for (int i = node.childCount()-4;i>=0;i--){
                   expandAll(tp.pathByAddingChild(model.getChild(node,i)));

Hi,
Iam not facing this problem. To CollapseAll, I do a tree.getModel().reload() which causes all nodes to get collapsed and remain so even if I reopen them manually.
Hope this helps.
cheers,
vidyut

JTree remove expand/collapse cross button...??

Hi all,
I have forbidden tree collapsing (by default it is fully expanded),
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Is it possible and can anyone give me advice how i can do this.
Thanks in advance.

I tried extending the BasicTreeUI to return nulls for the collapsed and exapnded icons as shown in the code below. For the most part, it works great! However, one can still expand/collapse the tree by clicking on the point where the vertical and horizontal lines connect.
I guess some one else will take over from here.
import java.awt.BorderLayout;
import javax.swing.Icon;
import javax.swing.JFrame;
import javax.swing.JScrollPane;
import javax.swing.JTree;
import javax.swing.WindowConstants;
import javax.swing.plaf.basic.BasicTreeUI;
import javax.swing.tree.DefaultMutableTreeNode;
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               new DefaultMutableTreeNode("Client Certificates", false);
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Problem with flow of expandable fields

Hi everyone,
I have important problem with flow of expandable fields in table in dynamic PDF form. The issue I am talking about you can see at the top of column 3 on page 2 in PDF in link below.
Here is uploaded PDF form and sample XML data (form has import button and is ReaderExtended that you can easily test it and see my problem):
http://www.speedyshare.com/718224676.html
Generally I have created table with 3 columns using Table object (each field has allow multiple lines selected and expand to fit). It is closed in FormBody subform which is flowed subform.
Row in table is repeatable and has “is allow to break page” setting set on.
Sometimes when there is a lot of text and row page break there is problem with flow.
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I posted link to my form in my first post.
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No problem while using option -m32.
@ uname -a
SunOS snt5010 5.10 Generic_127111-11 sun4v sparc SUNW,SPARC-Enterprise-T5220
$ CC -V
CC: Sun C++ 5.9 SunOS_sparc Patch 124863-01 2007/07/25
Here is some C++ program
############# foo5.cpp #############
template <typename T, T N, unsigned long S = sizeof(T) * 8>
struct static_number_of_ones
static const T m_value = static_number_of_ones<T, N, S - 1>::m_value >> 1;
static const unsigned long m_count = static_number_of_ones<T, N, S - 1>::m_count + (static_number_of_ones<T, N, S - 1>::m_value & 0x1);
template <typename T, T N>
struct static_number_of_ones<T, N, 0>
static const T m_value = N;
static const unsigned long m_count = 0;
template <typename T, T N>
struct static_is_power_of_2
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template <unsigned long N>
struct static_number_is_power_of_2
static const bool m_result = (static_number_of_ones<unsigned long, N>::m_count == 1);
int main(int argc)
int ret = 0;
if (argc > 1)
ret += static_is_power_of_2<unsigned short, 16>::m_result;
ret += static_is_power_of_2<unsigned int, 16>::m_result;
ret += static_is_power_of_2<unsigned long, 16>::m_result;
ret += static_number_is_power_of_2<16>::m_result;
else
ret += static_is_power_of_2<unsigned short, 17>::m_result;
ret += static_is_power_of_2<unsigned int, 17>::m_result;
ret += static_is_power_of_2<unsigned long, 17>::m_result;
ret += static_number_is_power_of_2<17>::m_result;
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Compiation:
@ CC -m32 foo5.cpp
// No problem
@ CC -m64 foo5.cpp
"foo5.cpp", line 20: Error: An integer constant expression is required here.
"foo5.cpp", line 36: Where: While specializing "static_is_power_of_2<unsigned long, 16>".
"foo5.cpp", line 36: Where: Specialized in non-template code.
"foo5.cpp", line 26: Error: An integer constant expression is required here.
"foo5.cpp", line 37: Where: While specializing "static_number_is_power_of_2<16>".
"foo5.cpp", line 37: Where: Specialized in non-template code.
"foo5.cpp", line 20: Error: An integer constant expression is required here.
"foo5.cpp", line 43: Where: While specializing "static_is_power_of_2<unsigned long, 17>".
"foo5.cpp", line 43: Where: Specialized in non-template code.
"foo5.cpp", line 26: Error: An integer constant expression is required here.
"foo5.cpp", line 44: Where: While specializing "static_number_is_power_of_2<17>".
"foo5.cpp", line 44: Where: Specialized in non-template code.
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Predefined macro:
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@ diff log32 log64
7c7
< #define __TIME__ "09:24:58"
#define __TIME__ "09:25:38"20c20
< #define __sparcv8plus 1
#define __sparcv9 1[snipped]
=========================
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Thanks,
Alex Vinokur

Bug 6749491 has been filed for this problem. It will be visible at [http://bugs.sun.com] in a day or two.
If you have a service contract with Sun, you can ask to have this bug's priority raised, and get a pre-release version of a compiler patch that fixes the problem.
Otherwise, you can check for new patches from time to time at
[http://developers.sun.com/sunstudio/downloads/patches/]
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I was not able to reproduce your problemimport javax.swing.*;
import javax.swing.tree.DefaultMutableTreeNode;
import javax.swing.tree.DefaultTreeModel;
import javax.swing.tree.TreePath;
import javax.swing.tree.TreeNode;
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import java.util.Enumeration;
import java.awt.*;
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}

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Hi,
I have a few problems while working with JTree. Here is the detail:
I get the name of the required file from JFileChooser and add it to the root node of JTree using
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The following happens.
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2) if I add it to a child of root, then if the node is collapsed before the event, after the event when it is expanded fileName is there.
3) However if it is expanded before adding the fileName,the fileName is not added (or not shown).
4) Further if I add another file(whether the node is collapsed or expanded) it is also not shown, means that it works only once during the life-time of the application.
5) I have used JFrame and call repaint() for both the JFrame and JTree but the problem is still there.
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Thanks in advance,
Hamid Mukhtar,
[email protected]
H@isoft Technologies.

Try doing this...
tree.getModel().reload(node)
node here is the node to which a new node is added

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import java.awt.Container;
import java.awt.GridLayout;
import javax.swing.JFrame;
import javax.swing.JMenu;
import javax.swing.JMenuBar;
import javax.swing.JMenuItem;
import javax.swing.JTree;
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          tree1.setRowHeight(0);
          contentPane.add(tree1);
          frame.pack();
          frame.show();
import java.awt.FlowLayout;
import java.util.EventObject;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JTextField;
import javax.swing.JTree;
import javax.swing.tree.DefaultTreeCellEditor;
import javax.swing.tree.DefaultTreeCellRenderer;
import javax.swing.tree.DefaultTreeModel;
import javax.swing.tree.TreeCellEditor;
import javax.swing.tree.TreeCellRenderer;
public class ComponentTreeCellEditor
     extends DefaultTreeCellEditor
     implements TreeCellEditor {
     private String m_oldValue;
     private TreeCellRenderer m_renderer = null;
     private DefaultTreeModel m_model = null;
     private JPanel m_display = null;
     private JTextField m_field = null;
     private JTree m_tree = null;
     public ComponentTreeCellEditor(
          JTree tree,
          DefaultTreeCellRenderer renderer) {
          super(tree, renderer);
          m_renderer = renderer;
          m_model = (DefaultTreeModel) tree.getModel();
          m_tree = tree;
          m_display = new JPanel(new FlowLayout(FlowLayout.LEFT));
          m_field = new JTextField();
          m_display.add(new JLabel("My Label "));
          m_display.add(m_field);
     public java.awt.Component getTreeCellEditorComponent(
          JTree tree,
          Object value,
          boolean isSelected,
          boolean expanded,
          boolean leaf,
          int row) {
          m_field.setText(value.toString());
          return m_display;
     public Object getCellEditorValue() {
          return m_field.getText();
      * The edited cell should always be selected.
      * @param anEvent the event that fired this function.
      * @return true, always.
     public boolean shouldSelectCell(EventObject anEvent) {
          return true;
      * Only edit immediately if the event is null.
      * @param event the event being studied
      * @return true if event is null, false otherwise.
     protected boolean canEditImmediately(EventObject event) {
          return (event == null);
}

You can provide a cell renderer to the JTree to paint the checkBox.
The following code checks or unchecks the box with each click also:
_tree.setCellRenderer(new DefaultTreeCellRenderer()
private JCheckBox checkBox = null;
public Component getTreeCellRendererComponent(JTree tree,
                                                Object value,
                                                boolean selected,
                                                boolean expanded,
                                                boolean leaf,
                                                int row,
                                                boolean hasFocus)
    // Each node will be drawn as a check box
    if (checkBox == null)
      checkBox = new JCheckBox();
      checkBox .setBackground(tree.getBackground());
    DefaultMutableTreeNode node = (DefaultMutableTreeNode)value;
    checkBox.setText(node.getUserObject().toString());
    checkBox.setSelected(selected);
    return checkBox;
});

Problem with Jtree and a checkbox

Hello,
I have a problem with my tree implementation.
I create a tree and i want to add a checkbox in each node.
this is my code :
DefaultMutableTreeNode root;
root = new DefaultMutableTreeNode(new JCheckBox());
DefaultTreeModel model = new DefaultTreeModel(root);
_tree = new JTree(model);
eastpane.add(tree);
THe problem is that my checkbox doesn't appear. And a message appears
instead of my checkbox.
But my tree appears.
Can anyone help me .
Thanks

You can provide a cell renderer to the JTree to paint the checkBox.
The following code checks or unchecks the box with each click also:
_tree.setCellRenderer(new DefaultTreeCellRenderer()
private JCheckBox checkBox = null;
public Component getTreeCellRendererComponent(JTree tree,
                                                Object value,
                                                boolean selected,
                                                boolean expanded,
                                                boolean leaf,
                                                int row,
                                                boolean hasFocus)
    // Each node will be drawn as a check box
    if (checkBox == null)
      checkBox = new JCheckBox();
      checkBox .setBackground(tree.getBackground());
    DefaultMutableTreeNode node = (DefaultMutableTreeNode)value;
    checkBox.setText(node.getUserObject().toString());
    checkBox.setSelected(selected);
    return checkBox;
});

Sorting JTree results in collapse of nodes!

I've searched and searched and can not find a good example of how to do this. I've found many threads that pose the question with the only answer being something like "I figured it out, thanks anyway".
My problem:
I've got a tree, many nodes, many depths. I'd like to sort it. My present algorithm is to traverse the tree and sort the list of children of each node. Once I sort the children, obviously the indexes have changed, so you must correct them.
I've tried:
remove all children from the parent
add the children in sorted order
If I do that using something like parent.remove and parent.insert, thats fine as long as no children UNDER those children have been expanded. If they have, then I'm not accounting for them and thus the tree continues to show those children under the wrong nodes once the sorted nodes are added.
If I do that using something like model.removeNodeFromParent and model.insertNodeInto, then the entire tree will collapse up to the node sorted on.
Either way sucks!
I've also tried passing Arrays.sort my own comparator that, depending on the compare outcome, will do the removeFromParent and insertNodeInto on the fly. This results in NOT collapsing the entire tree (probably because all nodes are never removed) however it seems like on a descending sort the nodes get messed up. I assumed this was because I was reordering them on the fly in the tree...but now that I'm thinking about it, maybe I was doing something else wrong.
In any case, is there a standard proceedure for doing this? Why does it seem so difficult? I've spent a good two days on this. Crazy!

Found this in another thread after all, might be my solution:
     public Vector savePaths() {
          Vector v = new Vector();
          for (int i=0; i<getTree().getRowCount(); i++) {
               if (getTree().isExpanded(i)) {
                    v.add(getTree().getPathForRow(i));
          return v;
     public void loadPaths(Vector v) {
          for (int i=0; i><v.size(); i++) {
               getTree().expandPath((TreePath) v.get(i));
     }

Problem with JTree and memory usage

I have problem with the JTree when memory usage is over the phisical memory( I have 512MB).
I use JTree to display very large data about structure organization of big company. It is working fine until memory usage is over the phisical memory - then some of nodes are not visible.
I hope somebody has an idea about this problem.

55%, it's still 1.6Gb....there shouldn't be a problem scanning something that it says will take up 300Mb, then actually only takes up 70Mb.
And not wrong, it obviously isn't releasing the memory when other applications need it because it doesn't, I have to close PS before it will release it. Yes, it probably is supposed to release it, but it isn't.
Thank you for your answer (even if it did appear to me to be a bit rude/shouty, perhaps something more polite than "Wrong!" next time) but I'm sitting at my computer, and I can see what is using how much memory and when, you can't.

Problem with JTree while expanding/collapsing a node

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