The DynamicTreeDemo.java example works well but throws an NPE when editing the root node. I suggest the following change to DynamicTree.java:
 

class MyTreeModelListener implements TreeModelListener {

public void treeNodesChanged(TreeModelEvent e) {

DefaultMutableTreeNode node;

node = (DefaultMutableTreeNode) (e.getTreePath().getLastPathComponent());

/*

* If the event lists children, then the changed node is the child of the node we've already gotten. Otherwise, the changed node and the specified

* node are the same.

*/

if (e.getChildIndices() != null) {

     int index = e.getChildIndices()[0];

     node = (DefaultMutableTreeNode) (node.getChildAt(index));

}

    System.out.println("The user has finished editing the node.");

    System.out.println("New value: " + node.getUserObject());

}
 
The original URLs were:
 
http://download.oracle.com/javase/tutorial/uiswing/examples/components/DynamicTreeDemoProject/src/components/DynamicTreeDemo.java
http://download.oracle.com/javase/tutorial/uiswing/examples/components/DynamicTreeDemoProject/src/components/DynamicTree.java