JDK : JDK1.5.0 b14 swat
Platform[s] : Sparc10
switch/Mode : -client -Xmixed

How to reproduce:
1. Launch Java2D demo by running "bin/java -jar demo/jfc/Java2D/*jar"
2. Open Options/RunWindow and click on Run to start the auto tests.
When it finished some test runs, it starts to generate java.lang.ArrayIndexOutOfBoundsException as below:

# bin/java -jar demo/jfc/Java2D/*jar
Exception while removing reference: java.lang.NullPointerException
java.lang.NullPointerException
at sun.java2d.Disposer.run(Disposer.java:109)
at java.lang.Thread.run(Thread.java:549)
Exception while removing reference: java.lang.NullPointerException
java.lang.NullPointerException
at sun.java2d.Disposer.run(Disposer.java:109)
at java.lang.Thread.run(Thread.java:549)

Java2D Demo RunWindow : 20 Runs, 10 second delay between tabs
java version: 1.5.0-beta
SunOS 5.10

#0 Wed Aug 06 13:12:58 PDT 2003, 4340.1797K used
#1 Wed Aug 06 13:15:27 PDT 2003, 6753.2734K used
#2 Wed Aug 06 13:17:54 PDT 2003, 7096.0234K used
#3 Wed Aug 06 13:20:21 PDT 2003, 9767.422K used
#4 Wed Aug 06 13:22:47 PDT 2003, 8673.359K used
#5 Wed Aug 06 13:25:14 PDT 2003, 9484.297K used
#6 Wed Aug 06 13:27:42 PDT 2003, 9051.789K used
#7 Wed Aug 06 13:30:09 PDT 2003, 7271.9766K used
java.lang.ArrayIndexOutOfBoundsException: 21
at java.util.Arrays$ArrayList.get(Arrays.java:2362)
at java2d.Intro$Surface$DdE.step(Intro.java:1131)
at java2d.Intro$Surface$Scene.step(Intro.java:540)
at java2d.Intro$Surface.paint(Intro.java:297)
at javax.swing.JComponent.paintWithOffscreenBuffer(JComponent.java:4599)
at javax.swing.JComponent.paintDoubleBuffered(JComponent.java:4552)
at javax.swing.JComponent._paintImmediately(JComponent.java:4495)
at javax.swing.JComponent.paintImmediately(JComponent.java:4302)
at javax.swing.RepaintManager.paintDirtyRegions(RepaintManager.java:410)
at javax.swing.SystemEventQueueUtilities$ComponentWorkRequest.run(SystemEventQueueUtilities.java:117)

at java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:178)
at java.awt.EventQueue.dispatchEvent(EventQueue.java:459)
at java.awt.EventDispatchThread.pumpOneEventForHierarchy(EventDispatchThread.java:214)
at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.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)

###@###.### 2003-08-06
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The java.lang.ArrayIndexOutOfBoundsException happens on Red Hat Advance Server 2.1 with linux-ia64 bundles.

Red Hat Linux Advanced Server release 2.1AS (Derry)
Linux prosignia 2.4.18-e.12smp #1 SMP Thu Oct 17 15:13:01 EDT 2002 ia64 unknown

###@###.### 2003-10-29
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