import javax.swing.*;
import javax.swing.plaf.*;
import javax.swing.plaf.nimbus.*;

public class NimbusPropertiesDoNotImplUIResource {
    private static final String[] defPropertyKeys = new String[] {
        "Tree.leafIcon", "Tree.closedIcon",
        "Tree.openIcon", "Tree.selectionForeground",
        "Tree.textForeground", "Tree.selectionBackground",
        "Tree.textBackground", "Tree.selectionBorderColor"};

    public static void main(String[] args) throws Exception {
        UIManager.setLookAndFeel(new NimbusLookAndFeel());
        for (String propertyKey : defPropertyKeys) {
            verifyProperty(propertyKey);
        }
    }

    private static void verifyProperty(String propertyKey) {
        Object property = UIManager.get(propertyKey);
        if (property == null) {
            throw new NullPointerException(String.format("UIManager.get('%s') returned null.", propertyKey));
        }
        if (!(property instanceof UIResource)) {
            throw new RuntimeException(String.format("Property '%s' is instance of '%s' instead of UIResource.",
                propertyKey, property.getClass()));
        }
    }
}