Salve,

il problema riguarda un'applicazione che deve visualizzare a video messaggi! Lo fa tramite l'uso di un JTextPane al quale vado ad applicare uno StyledDocument!

Dopo un certo numero di messaggi l'applicazione stampa nella console la seguente eccezione:

Exception in thread "AWT-EventQueue-0" java.lang.NullPointerException
at javax.swing.text.FlowView$FlowStrategy.layoutRow(F lowView.java:538)
at javax.swing.text.FlowView$FlowStrategy.layout(Flow View.java:452)
at javax.swing.text.FlowView.layout(FlowView.java:184 )
at javax.swing.text.BoxView.setSize(BoxView.java:380)
at javax.swing.text.BoxView.updateChildSizes(BoxView. java:349)
at javax.swing.text.BoxView.setSpanOnAxis(BoxView.jav a:331)
at javax.swing.text.BoxView.layout(BoxView.java:691)
at javax.swing.text.BoxView.setSize(BoxView.java:380)
at javax.swing.plaf.basic.BasicTextUI$RootView.setSiz e(BasicTextUI.java:1701)
at javax.swing.plaf.basic.BasicTextUI$RootView.paint( BasicTextUI.java:1420)
at javax.swing.plaf.basic.BasicTextUI.paintSafely(Bas icTextUI.java:725)
at javax.swing.plaf.basic.BasicTextUI.paint(BasicText UI.java:868)
at javax.swing.plaf.basic.BasicTextUI.update(BasicTex tUI.java:847)
at javax.swing.JComponent.paintComponent(JComponent.j ava:763)
at javax.swing.JComponent.paint(JComponent.java:1027)
at javax.swing.JComponent.paintToOffscreen(JComponent .java:5122)
at javax.swing.BufferStrategyPaintManager.paint(Buffe rStrategyPaintManager.java:285)
at javax.swing.RepaintManager.paint(RepaintManager.ja va:1128)
at javax.swing.JComponent._paintImmediately(JComponen t.java:5070)
at javax.swing.JComponent.paintImmediately(JComponent .java:4880)
at javax.swing.RepaintManager.paintDirtyRegions(Repai ntManager.java:723)
at javax.swing.RepaintManager.paintDirtyRegions(Repai ntManager.java:679)
at javax.swing.RepaintManager.seqPaintDirtyRegions(Re paintManager.java:659)
at javax.swing.SystemEventQueueUtilities$ComponentWor kRequest.run(SystemEventQueueUtilities.java:128)
at java.awt.event.InvocationEvent.dispatch(Invocation Event.java:209)
at java.awt.EventQueue.dispatchEvent(EventQueue.java: 597)
at java.awt.EventDispatchThread.pumpOneEventForFilter s(EventDispatchThread.java:273)
at java.awt.EventDispatchThread.pumpEventsForFilter(E ventDispatchThread.java:183)
at java.awt.EventDispatchThread.pumpEventsForHierarch y(EventDispatchThread.java:173)
at java.awt.EventDispatchThread.pumpEvents(EventDispa tchThread.java:168)
at java.awt.EventDispatchThread.pumpEvents(EventDispa tchThread.java:160)
at java.awt.EventDispatchThread.run(EventDispatchThre ad.java:121)
L'applicazione continua a funzionare regolarmente, ma non ho capito perchè sbuca fuori questo messaggio!