On Thu, 7 Jul 2022 11:11:27 GMT, Prasanta Sadhukhan <psadhuk...@openjdk.org> wrote:
> When we call JDesktopPane.setDesktopManager(new DefaultDesktopManager()) and > try to iconify an internalframe, it results in NPE > > Exception in thread "AWT-EventQueue-0" java.lang.NullPointerException > at > javax.swing.RepaintManager.getVolatileOffscreenBuffer(RepaintManager.java:1030) > at javax.swing.RepaintManager$PaintManager.paint(RepaintManager.java:1489) > at javax.swing.RepaintManager.paint(RepaintManager.java:1272) > at javax.swing.JComponent.paint(JComponent.java:1042) > at javax.swing.JComponent.paintChildren(JComponent.java:889) > at javax.swing.JComponent.paint(JComponent.java:1065) > at > com.apple.laf.AquaInternalFrameDockIconUI$ScaledImageLabel.updateIcon(AquaInternalFrameDockIconUI.java:193) > at > com.apple.laf.AquaInternalFrameDockIconUI$ScaledImageLabel.paint(AquaInternalFrameDockIconUI.java:204) > at javax.swing.JComponent.paintChildren(JComponent.java:889) > at javax.swing.JComponent.paint(JComponent.java:1065) > at javax.swing.JComponent.paintChildren(JComponent.java:889) > at javax.swing.JComponent.paint(JComponent.java:1065) > at javax.swing.JLayeredPane.paint(JLayeredPane.java:586) > > > it seems the RepaintManager.getVolatileOffscreenBuffer() is called with > JRootPane component for AquaLookAndFeel because of which > SwingUtilities.getWindowAncestor(JRootPane) returns null causing NPE. > > Fixed by adding a null check. The JInternalFrame can be successfully iconized > now after setting DesktopManager. Marked as reviewed by prr (Reviewer). ------------- PR: https://git.openjdk.org/jdk/pull/9408
