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java.lang.NullPointerException at javax.swing.MultiUIDefaults.getUIError(MultiUIDefaults.java:117) at javax.swing.UIDefaults.getUI(UIDefaults.java:721) at javax.swing.UIManager.getUI(UIManager.java:860) at javax.swing.JPanel.updateUI(JPanel.java:104) at javax.swing.JPanel.<init>(JPanel.java:64) at javax.swing.JPanel.<init>(JPanel.java:87) at javax.swing.JPanel.<init>(JPanel.java:95) at javax.swing.JRootPane.createGlassPane(JRootPane.java:482) at javax.swing.JRootPane.<init>(JRootPane.java:313) at javax.swing.JFrame.createRootPane(JFrame.java:247) at javax.swing.JFrame.frameInit(JFrame.java:228) at javax.swing.JFrame.<init>(JFrame.java:195) at oracle.ide.IdeCore$StartupWindow.<init>(IdeCore.java:1458) at oracle.ide.IdeCore.startupImpl(IdeCore.java:1084) at oracle.ide.Ide.startup(Ide.java:672) at oracle.ideimpl.Main.start(Main.java:49) at oracle.ideimpl.Main.main(Main.java:25)