NPE in FlatSpinnerUI with button-less JSpinner

[ebourg]

Hi,

I use a custom JSpinner with the buttons removed (the value is increased/decreased with the mousewheel instead). In this situation with FlatLaf 0.42 I get a NullPointerException in FlatSpinnerUI:

Exception in thread "AWT-EventQueue-0" java.lang.NullPointerException
	at com.formdev.flatlaf.ui.FlatSpinnerUI.update(FlatSpinnerUI.java:272)
	at javax.swing.JComponent.paintComponent(JComponent.java:780)
	at javax.swing.JComponent.paint(JComponent.java:1056)

Here is a minimal test case to reproduce the issue:

public static void main(String[] args) {
    SwingUtilities.invokeLater(() -> {
        FlatDarkLaf.install();
        JFrame frame = new JFrame("FlatLaf SpinnerUI Test");
        frame.setDefaultCloseOperation(WindowConstants.DISPOSE_ON_CLOSE);
        frame.setSize(800, 600);
        frame.setLocation(100, 100);
        frame.setVisible(true);
        frame.getContentPane().setLayout(new FlowLayout());

        JSpinner spinner = new JSpinner();
        for (Component component : spinner.getComponents()) {
            if (component.getName() != null && component.getName().endsWith("Button")) {
                spinner.remove(component);
            }
        }

        frame.getContentPane().add(spinner);
    });
}

[DevCharly]

Interesting use case 👍

Thx for reporting. Fixed in master branch.