Problems generating nodes in a JTree

Question

Hi Folks,
I'm having difficulty in generating a JTree. The code follows. Basically, my application creates objects in a hierarchical fashion. The application creates objects of the classes Source, Requirement, DesignElement, ImplementationElement and TestSpecification.
Objects of each class have a parent relationship with the next, i.e., Source acts as parent to Requirement, Requirement to DesignElement etc. The Source, Requirement etc. classes each have a method for adding a child object, where the object is added to a Vector. Each parent may have more than one child.
The method generateTree() gets called first, which in turn calls addNodes(). addNodes() is supposed to add parent nodes and their children recursively. An example would be as follows;
root
|
--- S1 - Source 1
|
--- S2 - Source 2
| |
| --- R1 - Requirement 1
| |
| --- D1 - Design 1
|
--- S3 - Source 3
etc.
Providing that I only add Source and Requirement objects, the tree is generated correctly. If I try to add a Design Element or below,
either the node doesn't show, or I loss other nodes.
I've really been tearing my hair out over this and would really appreciate any advice over where I'm going wrong!
Martin :-(
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import javax.swing.tree.*;
import java.util.Vector;
* Provides services for regenerating the tree when artifacts are added or removed.
public class TreeServices {
  private static Vector sourceList, childArtifacts;
  private static JTree tree;
  private static DefaultMutableTreeNode newNode;
   * Cycles through each source artifact, adding them as a node to the tree and calling
   * addNodes() to add subsequent generations of children to the tree.
  public static JTree generateTree(JTree tree, ArtifactDatabase database) {
    sourceList = database.getSourceList();
    DefaultMutableTreeNode top = new DefaultMutableTreeNode("Project");
    tree = new JTree(top);
    DefaultMutableTreeNode node = null;
    for (int i = 0; i < sourceList.size(); i++) {
      node = new DefaultMutableTreeNode(sourceList.elementAt(i));
      top.add(node);
      addNodes((TraceabilityArtifact)sourceList.elementAt(i), node);
    return tree;
   * Adds children nodes to the tree recursively.
  private static void addNodes(TraceabilityArtifact art, DefaultMutableTreeNode node) {
    childArtifacts = art.getChildArtifacts();
    if (!childArtifacts.isEmpty()) {
      for (int i = 0; i < childArtifacts.size(); i++) {
        newNode = new DefaultMutableTreeNode(childArtifacts.elementAt(i));
        node.add(newNode);
        if (!(((TraceabilityArtifact)childArtifacts.elementAt(i)).getChildArtifacts()).isEmpty()) {
          addNodes((TraceabilityArtifact)childArtifacts.elementAt(i), newNode);
}

Answer 1

U need to call reload() method on ur TreeModel.
((DefaultTreeModel)tree.getModel()).reload()
i u wanna reload complete tree
or
((DefaultTreeModel)tree.getModel()).reload(TreeNode node) if u wanna reload a particular treenode
hope this works
Enjoy !!
Raj