Function Key not work when using jre1.5

My application was based on JDK1.3 to develop and JRE 1.3 is using in the client side.
In the application, function keys are the shortcut and it is working fine based on the above setting.
Since JRE 1.5 is encouraged to be used in the future, we try to use it to run our application. But we find that all function keys are not working.
I am not sure the fact, but I get the following exception sometimes in the console:
Exception in thread "AWT-EventQueue-0" java.lang.ClassCastException
at javax.swing.LayoutComparator.compare(LayoutComparator.java:61)
at java.util.Arrays.mergeSort(Arrays.java:1307)
at java.util.Arrays.mergeSort(Arrays.java:1296)
at java.util.Arrays.mergeSort(Arrays.java:1296)
at java.util.Arrays.mergeSort(Arrays.java:1295)
at java.util.Arrays.sort(Arrays.java:1223)
at java.util.Collections.sort(Collections.java:159)
at javax.swing.SortingFocusTraversalPolicy.enumerateAndSortCycle(Sorting
FocusTraversalPolicy.java:119)
at javax.swing.SortingFocusTraversalPolicy.getFirstComponent(SortingFocu
sTraversalPolicy.java:425)
at javax.swing.LayoutFocusTraversalPolicy.getFirstComponent(LayoutFocusT
raversalPolicy.java:148)
at javax.swing.SortingFocusTraversalPolicy.getDefaultComponent(SortingFo
cusTraversalPolicy.java:502)
at javax.swing.LegacyGlueFocusTraversalPolicy.getDefaultComponent(Legacy
GlueFocusTraversalPolicy.java:131)
at java.awt.FocusTraversalPolicy.getInitialComponent(FocusTraversalPolic
y.java:149)
at java.awt.DefaultKeyboardFocusManager.dispatchEvent(DefaultKeyboardFoc
usManager.java:318)
at java.awt.Component.dispatchEventImpl(Component.java:3841)
at java.awt.Container.dispatchEventImpl(Container.java:2024)
at java.awt.Window.dispatchEventImpl(Window.java:1766)
at java.awt.Component.dispatchEvent(Component.java:3803)
at java.awt.EventQueue.dispatchEvent(EventQueue.java:463)
at java.awt.SequencedEvent.dispatch(SequencedEvent.java:93)
at java.awt.EventQueue.dispatchEvent(EventQueue.java:461)
at java.awt.EventDispatchThread.pumpOneEventForHierarchy(EventDispatchTh
read.java:234)
at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThre
ad.java:163)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:157)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:149)
at java.awt.EventDispatchThread.run(EventDispatchThread.java:110)
I try to compile my code using JDK 1.3 and 1.5. Actually, there is no compilation error.
Please help me if you know the fact or solution.
Thanks a lot!

The supported Software in iPlanet's Portal Server is JDK/JRE 1.2.2_07 and JDK 1.2.2_09(in SP4). Starting with JDK1.3.1_01, applets are handled somewhat differently. Enable Java and look at the error messages in Java Console to find why the Netlet is not loading in JDK1.3.1_02. The issue might be with two JRE's or with your cache setting. Hope this helps you.
Thanks,
Raj_indts
Developer Technical Support
Sun Microsystems
http://www.sun.com/developers/support

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