Platform: WinXP (Regional option was set to Japanese)
JDK: /net/jano.sfbay/export/disk12/i18n/NightlyBuilds/archives/2005-11-30.mustang

Regressed back, it seems the bug started from b56, and can be reproduced always.

To reproduce:
1. Make sure the system has additional languages installed from Supplemental language supportin "Regional and Language Options" control panel
2. Launch demo Font2DTest
3. Text to use: select "Text File", and load a text file, then
4. Text to use: select "User Text", enter a couple of Unicode char, eg: \u4e56 \u4f44, then
5. Text to use: select "Unicode Range"
6. Range: select "Surrogates Area"
   The following exceptions are thrown

V:\onestop\jdk\6.0\promoted\all\b56\binaries\windows-i586\demo\jfc\Font2DTest>..\..\..\bin\java -jar Font2DTest.jar
Exception in thread "AWT-EventQueue-0" java.lang.ArrayIndexOutOfBoundsException: 1
        at sun.font.GlyphLayout$EngineRecord.init(GlyphLayout.java:589)
        at sun.font.GlyphLayout.nextEngineRecord(GlyphLayout.java:457)
        at sun.font.GlyphLayout.layout(GlyphLayout.java:380)
        at sun.font.ExtendedTextSourceLabel.createGV(ExtendedTextSourceLabel.java:308)
        at sun.font.ExtendedTextSourceLabel.getGV(ExtendedTextSourceLabel.java:294)
        at sun.font.ExtendedTextSourceLabel.createLogicalBounds(ExtendedTextSourceLabel.java:208)
        at sun.font.ExtendedTextSourceLabel.getAdvance(ExtendedTextSourceLabel.java:117)
        at java.awt.font.TextLine.init(TextLine.java:264)
        at java.awt.font.TextLine.<init>(TextLine.java:110)
        at java.awt.font.TextLine.fastCreateTextLine(TextLine.java:949)
        at java.awt.font.TextLayout.fastInit(TextLayout.java:585)
        at java.awt.font.TextLayout.<init>(TextLayout.java:374)
        at FontPanel$FontCanvas.modeSpecificDrawChar(FontPanel.java:621)
        at FontPanel$FontCanvas.drawText(FontPanel.java:940)
        at FontPanel$FontCanvas.paintComponent(FontPanel.java:999)
        at javax.swing.JComponent.paint(JComponent.java:975)
        at javax.swing.JComponent.paintChildren(JComponent.java:811)
        at javax.swing.JComponent.paint(JComponent.java:984)
        at javax.swing.JComponent.paintChildren(JComponent.java:811)
        at javax.swing.JComponent.paint(JComponent.java:984)
        at javax.swing.JComponent.paintChildren(JComponent.java:811)
        at javax.swing.JComponent.paint(JComponent.java:984)
        at javax.swing.JComponent.paintChildren(JComponent.java:811)
        at javax.swing.JComponent.paint(JComponent.java:984)
        at javax.swing.JLayeredPane.paint(JLayeredPane.java:559)
        at javax.swing.JComponent.paintChildren(JComponent.java:811)
        at javax.swing.JComponent.paint(JComponent.java:984)
        at javax.swing.JComponent.paintToOffscreen(JComponent.java:5077)
        at javax.swing.BufferStrategyPaintManager.paint(BufferStrategyPaintManager.java:279)
        at javax.swing.RepaintManager.paint(RepaintManager.java:1055)
        at javax.swing.JComponent._paintImmediately(JComponent.java:5025)
        at javax.swing.JComponent.paintImmediately(JComponent.java:4843)
        at javax.swing.RepaintManager.paintDirtyRegions(RepaintManager.java:682)
        at javax.swing.RepaintManager.paintDirtyRegions(RepaintManager.java:638)
        at javax.swing.RepaintManager.seqPaintDirtyRegions(RepaintManager.java:618)
        at javax.swing.SystemEventQueueUtilities$ComponentWorkRequest.run(SystemEventQueueUtilities.java:128)
        at java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:209)
        at java.awt.EventQueue.dispatchEvent(EventQueue.java:597)
        at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:273)
        at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:183)
        at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:173)
        at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:168)
        at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:160)
        at java.awt.EventDispatchThread.run(EventDispatchThread.java:121)

This works without exception in Tiger, thus a regression.
please find an attatched small test to easily reproduce the problem.

i think the bug is introduced by the fixing for bug 6328154.
At EngineRecord.init(), the problem occurred when the current char
is a high surrogate char and it tries to fetch the next char to
see whether the next char is a low surrogate to make it as supplementary char.
If there is no next char, the exception get thrown.