QuietEditorPane.requestFocus null
java.lang.Exception: Stack trace
        at java.lang.Thread.dumpStack(Thread.java:1071)
        at org.openide.text.QuietEditorPane.requestFocus(QuietEditorPane.java:39)
        at javax.swing.JComponent.requestDefaultFocus(JComponent.java:2196)
        at javax.swing.plaf.basic.BasicTabbedPaneUI.requestFocusForVisibleComponent(BasicTabbedPaneUI.java:1789)
        at javax.swing.plaf.basic.BasicTabbedPaneUI$TabbedPaneLayout.layoutContainer(BasicTabbedPaneUI.java:2160)
        at java.awt.Container.layout(Container.java:1017)
        at java.awt.Container.doLayout(Container.java:1007)
        at java.awt.Container.validateTree(Container.java:1089)
        at java.awt.Container.validateTree(Container.java:1096)
        at java.awt.Container.validateTree(Container.java:1096)
        at java.awt.Container.validateTree(Container.java:1096)
        at java.awt.Container.validateTree(Container.java:1096)
        at java.awt.Container.validateTree(Container.java:1096)
        at java.awt.Container.validateTree(Container.java:1096)
        at java.awt.Container.validateTree(Container.java:1096)
        at java.awt.Container.validateTree(Container.java:1096)
        at java.awt.Container.validate(Container.java:1064)
        at javax.swing.RepaintManager.validateInvalidComponents(RepaintManager.java:353)
        at javax.swing.SystemEventQueueUtilities$ComponentWorkRequest.run(SystemEventQueueUtilities.java:116)
        at java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:178)
        at java.awt.EventQueue.dispatchEvent(EventQueue.java:448)
        at java.awt.EventDispatchThread.pumpOneEventForHierarchy(EventDispatchThread.java:197)
        at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:150)
        at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:144)
        at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:136)
        at java.awt.EventDispatchThread.run(EventDispatchThread.java:99)