FULL PRODUCT VERSION :
java version "1.6.0_01"
Java(TM) SE Runtime Environment (build 1.6.0_01-b06)
Java HotSpot(TM) Client VM (build 1.6.0_01-b06, mixed mode, sharing)


ADDITIONAL OS VERSION INFORMATION :
Linux 2.6.18.5-gg10-mixed64-32 #1 SMP Tue May 8 22:29:42 PDT 2007 x86_64 GNU/Linux

A DESCRIPTION OF THE PROBLEM :
A long string on a DefaultMutableTreeNode causes severe rendering problems when using GTKLookAndFeel on J2SE 6.0.


STEPS TO FOLLOW TO REPRODUCE THE PROBLEM :
Compile and run the following test case:

#--------------------------------------------
package pkg1;

import java.awt.*;
import javax.swing.*;
import javax.swing.tree.DefaultMutableTreeNode;

public class TreeRenderBug {
  public static void main(String[] args) throws Exception {
    UIManager.setLookAndFeel("com.sun.java.swing.plaf.gtk.GTKLookAndFeel");

    final DefaultMutableTreeNode root = new DefaultMutableTreeNode("Root");
    final StringBuilder longString = new StringBuilder(5000);

    // NOTE: On a local console, the bug reproduces at 4092 but not at 4091.
    // To crash the NX server, use string length 5456 or higher.
    int threshold = 4092; // To repro on local console
    threshold = 5456; // To repro crashing NX; may need higher number.
    System.out.println ("Using threshold " + threshold);

    for (int i = 0; i < threshold; i++) {
      longString.append(i % 10);
    }

    root.add(new DefaultMutableTreeNode(longString.toString()));
    final JTree tree = new JTree(root);
    final JScrollPane scrollPane = new JScrollPane();
    scrollPane.getViewport().add(tree);
    final JFrame frame = new JFrame();
    frame.getContentPane().setLayout(new BorderLayout());
    frame.getContentPane ().add(scrollPane, BorderLayout.CENTER);
    frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    frame.setSize(new Dimension(800, 600));
    frame.setVisible(true);
  }
}
#--------------------------------------------

The JTree rendering is corrupt. The work-around is to shorten the string set on the DefaultMutableTreeNode. Other look-and-feels seem to truncate the string on their own.

For a sufficiently large string, this test case will crash your NX server if you are running inside an NX session. This problem does not occur with J2SE 5.0.


EXPECTED VERSUS ACTUAL BEHAVIOR :
EXPECTED -
Clear display of the tree and its nodes.
ACTUAL -
Rendering is corrupt.

ERROR MESSAGES/STACK TRACES THAT OCCUR :
No error messages or stack traces.

REPRODUCIBILITY :
This bug can be reproduced always.

---------- BEGIN SOURCE ----------
See Steps to Reproduce.
---------- END SOURCE ----------

CUSTOMER SUBMITTED WORKAROUND :
Some possibilities:
1) Shorten the string set on DefaultMutableTreeNode.
2) Don't use GTKLookAndFeel.
3) Use J2SE 5.0.