The node renderer is not automatically resized when the caption text of an item of the tree changes. If your create a node and change its caption into a longer caption, you won't be able to see the whole caption until you destroy and create the node again. This occurs on Solaris with JDK1.1.5(k) and swing-pre-1.0 (Jan 30).

The following example creates a node with an empty caption "", then changes the
text afterwards.

import com.sun.java.swing.* ;
import com.sun.java.swing.tree.* ;
import java.awt.* ;
import java.awt.event.* ;


public class TreeTest extends JFrame implements ActionListener
{
  JButton addButton1 ;
  JButton addButton2 ;
  DefaultMutableTreeNode root ;
  DefaultTreeModel treeModel ;


  public static void main(String[] args)
  {
    TreeTest panel = new TreeTest() ;
    panel.setVisible(true) ;
  }

  public TreeTest()
  {
    super("test") ;
    getContentPane().setLayout(null) ;
    setBounds(0,0,600,400) ;

    root = new DefaultMutableTreeNode("root") ;
    treeModel = new DefaultTreeModel(root) ;
    JTree tree = new JTree(treeModel) ;
    tree.setBounds(10,100,300,200) ;
    getContentPane().add(tree) ;

    addButton1 = new JButton("add1") ;
    addButton1.setBounds(0,30,100,25) ;
    addButton1.addActionListener(this) ;
    getContentPane().add(addButton1) ;

    addButton2 = new JButton("add2") ;
    addButton2.setBounds(110,30,100,25) ;
    addButton2.addActionListener(this) ;
    getContentPane().add(addButton2) ;

  }

  public void actionPerformed(ActionEvent e)
  {
    if (e.getSource()==addButton1)
    {
      TreeData treeData = new TreeData("abcdefghij") ;
      DefaultMutableTreeNode newNode = new DefaultMutableTreeNode(treeData) ;
      treeModel.insertNodeInto(newNode,root,0) ;
      treeData.setCaption("aaaa") ;
    }
    else
    if (e.getSource()==addButton2)
    {
      TreeData treeData = new TreeData("") ;
      DefaultMutableTreeNode newNode = new DefaultMutableTreeNode(treeData) ;
      treeModel.insertNodeInto(newNode,root,0) ;
      treeData.setCaption("bbbb") ;
    }
  }
}


class TreeData
{
  String caption ;
  public TreeData(String caption)
  {
    this.caption = caption ;
  }

  public void setCaption(String caption)
  {
    this.caption = caption ;
  }

  public String toString()
  {
    return caption ;
  }
}

This bug was sent into swing-feedback by:
Yannick Saillet, Software Engineer,
IBM Deutschland, Education&Training (Germany)
E-mail: ###@###.###
or: ###@###.###