Follow steps below..

1) Copy jars from jre/lib/im to jre/lib/ext
2) Launch SwingSet2
3) Change look and feel to Windows style laf
4) Goto tree demo
5) Edit one node
6) Change input to Devanagari mode
7) Enter few hindi characters (Screenshot attached)
8) Commit the editing
9) Try editing the same node by double clicking/clicking etc

IllegalArgumentException is thrown

Exception in thread "AWT-EventQueue-0" java.lang.IllegalArgumentException: offse
tLimit must be after current position
        at java.awt.font.LineBreakMeasurer.nextOffset(LineBreakMeasurer.java:337
)
        at java.awt.font.LineBreakMeasurer.nextLayout(LineBreakMeasurer.java:422
)
        at javax.swing.text.TextLayoutStrategy.sync(TextLayoutStrategy.java:298)

        at javax.swing.text.TextLayoutStrategy.removeUpdate(TextLayoutStrategy.j
ava:65)
        at javax.swing.text.FlowView.removeUpdate(FlowView.java:252)
        at javax.swing.plaf.basic.BasicTextFieldUI$I18nFieldView.removeUpdate(Ba
sicTextFieldUI.java:444)
        at javax.swing.text.View.forwardUpdateToView(View.java:1219)
        at javax.swing.text.FlowView$LogicalView.forwardUpdateToView(FlowView.ja
va:764)
        at javax.swing.text.View.forwardUpdate(View.java:1192)
        at javax.swing.text.View.removeUpdate(View.java:757)
        at javax.swing.text.FlowView.removeUpdate(FlowView.java:251)
        at javax.swing.plaf.basic.BasicTextFieldUI$I18nFieldView.removeUpdate(Ba
sicTextFieldUI.java:444)
        at javax.swing.plaf.basic.BasicTextUI$RootView.removeUpdate(BasicTextUI.
java:1540)
        at javax.swing.plaf.basic.BasicTextUI$UpdateHandler.removeUpdate(BasicTe
xtUI.java:1800)
        at javax.swing.text.AbstractDocument.fireRemoveUpdate(AbstractDocument.j
ava:243)
        at javax.swing.text.AbstractDocument.handleRemove(AbstractDocument.java:
608)
        at javax.swing.text.AbstractDocument.remove(AbstractDocument.java:576)
        at javax.swing.text.AbstractDocument.replace(AbstractDocument.java:652)
        at javax.swing.text.JTextComponent.setText(JTextComponent.java:1697)
        at javax.swing.DefaultCellEditor$1.setValue(DefaultCellEditor.java:72)
        at javax.swing.DefaultCellEditor.getTreeCellEditorComponent(DefaultCellE
ditor.java:239)
        at javax.swing.tree.DefaultTreeCellEditor.getTreeCellEditorComponent(Def
aultTreeCellEditor.java:198)
        at javax.swing.plaf.basic.BasicTreeUI.startEditing(BasicTreeUI.java:2142
)
        at javax.swing.plaf.basic.BasicTreeUI$Handler.handleSelection(BasicTreeU
I.java:3613)
        at javax.swing.plaf.basic.BasicTreeUI$Handler.mousePressed(BasicTreeUI.j
ava:3553)
        at java.awt.Component.processMouseEvent(Component.java:5952)
        at javax.swing.JComponent.processMouseEvent(JComponent.java:3285)
        at java.awt.Component.processEvent(Component.java:5720)
        at java.awt.Container.processEvent(Container.java:1960)
        at java.awt.Component.dispatchEventImpl(Component.java:4365)
        at java.awt.Container.dispatchEventImpl(Container.java:2018)
        at java.awt.Component.dispatchEvent(Component.java:4195)
        at java.awt.LightweightDispatcher.retargetMouseEvent(Container.java:4222
)
        at java.awt.LightweightDispatcher.processMouseEvent(Container.java:3883)

        at java.awt.LightweightDispatcher.dispatchEvent(Container.java:3816)
        at java.awt.Container.dispatchEventImpl(Container.java:2004)
        at java.awt.Window.dispatchEventImpl(Window.java:2210)
        at java.awt.Component.dispatchEvent(Component.java:4195)
        at java.awt.EventQueue.dispatchEvent(EventQueue.java:599)
        at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThre
ad.java:273)
        at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.
java:183)
        at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThre
ad.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)
Exception in thread "AWT-EventQueue-0" java.lang.IllegalArgumentException: offse
t out of bounds
        at java.text.RuleBasedBreakIterator.checkOffset(RuleBasedBreakIterator.j
ava:724)
        at java.text.RuleBasedBreakIterator.preceding(RuleBasedBreakIterator.jav
a:772)
        at javax.swing.text.GlyphView.getBreakSpotUseBreakIterator(GlyphView.jav
a:799)
        at javax.swing.text.GlyphView.getBreakSpot(GlyphView.java:728)
        at javax.swing.text.GlyphView.getBreakWeight(GlyphView.java:668)
        at javax.swing.text.FlowView$LogicalView.getPreferredSpan(FlowView.java:
702)
        at javax.swing.text.FlowView.calculateMinorAxisRequirements(FlowView.jav
a:215)
        at javax.swing.text.BoxView.checkRequests(BoxView.java:911)
        at javax.swing.text.BoxView.getPreferredSpan(BoxView.java:519)
        at javax.swing.text.FlowView$LogicalView.getPreferredSpan(FlowView.java:
701)
        at javax.swing.text.FlowView.calculateMinorAxisRequirements(FlowView.jav
a:215)
        at javax.swing.text.BoxView.checkRequests(BoxView.java:911)
        at javax.swing.text.BoxView.setSpanOnAxis(BoxView.java:325)
        at javax.swing.text.BoxView.layout(BoxView.java:682)
        at javax.swing.text.FlowView.layout(FlowView.java:202)
        at javax.swing.text.BoxView.setSize(BoxView.java:379)
        at javax.swing.plaf.basic.BasicTextUI$RootView.setSize(BasicTextUI.java:
1638)
        at javax.swing.plaf.basic.BasicTextUI.modelToView(BasicTextUI.java:956)
        at javax.swing.text.DefaultCaret.repaintNewCaret(DefaultCaret.java:1288)

        at javax.swing.text.DefaultCaret$1.run(DefaultCaret.java:1267)
        at java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:209)
        at java.awt.EventQueue.dispatchEvent(EventQueue.java:597)
        at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThre
ad.java:273)
        at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.
java:183)
        at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThre
ad.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)