java.lang.NullPointerException: This exception has no message.

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at javax.swing.RepaintManager.currentManager(
at javax.swing.JComponent.repaint(
at java.awt.Component.repaint(
at javax.swing.JComponent.setFont(
at javax.swing.LookAndFeel.installColorsAndFont(
at javax.swing.plaf.basic.BasicPanelUI.installDefaults(
at javax.swing.plaf.basic.BasicPanelUI.installUI(
at javax.swing.JComponent.setUI(
at javax.swing.JPanel.setUI(
at javax.swing.JPanel.updateUI(
at javax.swing.JPanel.(
at javax.swing.JPanel.(
at javax.swing.JPanel.(
at lukemoll.MyClass.(

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