FULL PRODUCT VERSION :
java version "1.4.2_05"
Java(TM) 2 Runtime Environment, Standard Edition (build 1.4.2_05-b04)
Java HotSpot(TM) Client VM (build 1.4.2_05-b04, mixed mode)

[However, checking the source code for 1.5 shows this problem unchanged]

ADDITIONAL OS VERSION INFORMATION :
Microsoft Windows XP [Version 5.1.2600]

A DESCRIPTION OF THE PROBLEM :
Both JComponent.getManagingFocusForwardTraversalKeys and BasicSplitPanelUI.installDefaults contain code like the following:

if (managingFocusForwardTraversalKeys==null) {
managingFocusForwardTraversalKeys = new TreeSet();
managingFocusForwardTraversalKeys.add(
KeyStroke.getKeyStroke(KeyEvent.VK_TAB, InputEvent.CTRL_MASK));
}

However, KeyStroke does not implement Comparable, so the TreeSet (which is backed by a TreeMap) will throw a ClassCastException eventually if the above code is used.

It seems like the solution is to make it a HashSet in both classes.

This code appears to be identical in all released versions of JRE 1.4.x and 1.5.x.

(Note that this bug may be a duplicate. I submitted a bug related to this problem some time ago, but included a bad email address, and never saw it in the bug database, so wanted to make sure it got filed.)

STEPS TO FOLLOW TO REPRODUCE THE PROBLEM :
I do not have exact steps to reproduce... I found the exception in a log from a deployed system.

The code that triggered it was extremely simple, though. The exception was thrown at the "new" call for a sub-class of JTextArea:
contentField_ = new MTextArea();

where MTextArea is:
public class MTextArea extends JTextArea implements MTextComp2D
{

...
public MTextArea()
{
super();
init();
}

...
}


ERROR MESSAGES/STACK TRACES THAT OCCUR :
java.lang.ClassCastException
at java.util.TreeMap.compare(Unknown Source)
at java.util.TreeMap.put(Unknown Source)
at java.util.TreeSet.add(Unknown Source)
at javax.swing.JComponent.getManagingFocusForwardTraversalKeys(Unknown
Source)
at javax.swing.JTextArea.<init>(Unknown Source)
at javax.swing.JTextArea.<init>(Unknown Source)
at com.mayaviz.art.swing.text.MTextArea.<init>(MTextArea.java:49)

REPRODUCIBILITY :
This bug can be reproduced occasionally.

CUSTOMER SUBMITTED WORKAROUND :
It seems that making sure managingFocusForwardTraversalKeys is never null when the JComponent is initialized might work around this problem.
###@###.### 2005-04-20 09:24:28 GMT