java - ヘッドレスで new JPanel() を呼び出すときの NPE (RepaintManager.currentManager)

Question

ヘッドレス Linux ボックスopenjdk-8-jdk-armhfを実行しています。アプリケーションを実行すると、次の行が表示されます。

METRICS = new JPanel().getFontMetrics(FONT);

に戻る NullPointerException をスローしますRepaintManager.currentManager(RepaintManager.java:262)。これは次のようになります。

    public static RepaintManager currentManager(Component c) {
       // Note: DisplayChangedRunnable passes in null as the component, so if
       // component is ever used to determine the current
       // RepaintManager, DisplayChangedRunnable will need to be modified
       // accordingly.
       return currentManager(AppContext.getAppContext());
    }

完全なトレースは次のとおりです。

java.lang.NullPointerException
    at javax.swing.RepaintManager.currentManager(RepaintManager.java:262)
    at javax.swing.JComponent.repaint(JComponent.java:4799)
    at java.awt.Component.repaint(Component.java:3303)
    at javax.swing.JComponent.setFont(JComponent.java:2756)
    at javax.swing.LookAndFeel.installColorsAndFont(LookAndFeel.java:208)
    at javax.swing.plaf.basic.BasicPanelUI.installDefaults(BasicPanelUI.java:66)
    at javax.swing.plaf.basic.BasicPanelUI.installUI(BasicPanelUI.java:56)
    at javax.swing.JComponent.setUI(JComponent.java:664)
    at javax.swing.JPanel.setUI(JPanel.java:153)
    at javax.swing.JPanel.updateUI(JPanel.java:126)
    at javax.swing.JPanel.<init>(JPanel.java:86)
    at javax.swing.JPanel.<init>(JPanel.java:109)
    at javax.swing.JPanel.<init>(JPanel.java:117)
    at lukemoll.MyClass.<init>(MyClass.java:15)

jsvcコマンドとコマンドの両方を使用して、このエラーを再現できjavaます。