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This is somewhat random - by closing the one of the tabs in the output window it just turn into eternal firing of these exceptions. A restart is inevitable. NetBeans IDE Dev (Build 200604271800) 1.6.0-beta2; Java HotSpot(TM) Client VM 1.6.0-beta2-b82 Windows XP version 5.1 running on x86 en_GB (nb); Cp1252 java.lang.ArrayIndexOutOfBoundsException: 3 at javax.swing.plaf.basic.BasicTabbedPaneUI$TabbedPaneLayout.padSelectedTab (BasicTabbedPaneUI.java:2820) at javax.swing.plaf.basic.BasicTabbedPaneUI$TabbedPaneLayout.calculateTabRects (BasicTabbedPaneUI.java:2691) at javax.swing.plaf.basic.BasicTabbedPaneUI$TabbedPaneLayout.calculateLayoutInfo (BasicTabbedPaneUI.java:2484) at javax.swing.plaf.basic.BasicTabbedPaneUI$TabbedPaneLayout.layoutContainer (BasicTabbedPaneUI.java:2383) at java.awt.Container.layout(Container.java:1419) at java.awt.Container.doLayout(Container.java:1408) at java.awt.Container.validateTree(Container.java:1491) at java.awt.Container.validate(Container.java:1466) at javax.swing.plaf.basic.BasicTabbedPaneUI.ensureCurrentLayout (BasicTabbedPaneUI.java:1421) at javax.swing.plaf.basic.BasicTabbedPaneUI.getTabBounds (BasicTabbedPaneUI.java:1441) at javax.swing.JTabbedPane.getBoundsAt(JTabbedPane.java:1266) at org.netbeans.core.output2.ui.CloseButtonTabbedPane.findTabForCoordinate (CloseButtonTabbedPane.java:290) at org.netbeans.core.output2.ui.CloseButtonTabbedPane$CloseButtonListener.eventDis patched(CloseButtonTabbedPane.java:353) at java.awt.Toolkit$SelectiveAWTEventListener.eventDispatched (Toolkit.java:2360) at java.awt.Toolkit$ToolkitEventMulticaster.eventDispatched (Toolkit.java:2252) at java.awt.Toolkit$ToolkitEventMulticaster.eventDispatched (Toolkit.java:2251) at java.awt.Toolkit$ToolkitEventMulticaster.eventDispatched (Toolkit.java:2251) at java.awt.Toolkit$ToolkitEventMulticaster.eventDispatched (Toolkit.java:2251) at java.awt.Toolkit$ToolkitEventMulticaster.eventDispatched (Toolkit.java:2251) at java.awt.Toolkit.notifyAWTEventListeners(Toolkit.java:2210) at java.awt.Component.dispatchEventImpl(Component.java:4305) at java.awt.Container.dispatchEventImpl(Container.java:2042) at java.awt.Component.dispatchEvent(Component.java:4237) at java.awt.LightweightDispatcher.retargetMouseEvent (Container.java:4248) at java.awt.LightweightDispatcher.trackMouseEnterExit (Container.java:4037) at java.awt.LightweightDispatcher.processMouseEvent (Container.java:3894) at java.awt.LightweightDispatcher.dispatchEvent(Container.java:3842) at java.awt.Container.dispatchEventImpl(Container.java:2028) at java.awt.Window.dispatchEventImpl(Window.java:2300) at java.awt.Component.dispatchEvent(Component.java:4237) [catch] at java.awt.EventQueue.dispatchEvent(EventQueue.java:599) 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)
*** Issue 75748 has been marked as a duplicate of this issue. ***
*** Issue 76029 has been marked as a duplicate of this issue. ***
P2, since this forces the user to shut down IDE. Seems to be specific to Mustang..
FYI, this is specific to Mustang b83. I downgraded to b82 and the problem went away. This doesn't necessarily mean it is a JDK bug, but it probably is :)
Hmmm - if you read the report I'm actually using Mustang b82 when encountering the issue.
duplicate of #75955. different stacktrace but same user action and same build it appeared in. please note that it's probably the b82 build of mustang where this started, not b83. *** This issue has been marked as a duplicate of 75955 ***