test/jdk/javax/swing/JTree/8003830/bug8003830.java

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 * version 2 for more details (a copy is included in the LICENSE file that
 * accompanied this code).
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 * 2 along with this work; if not, write to the Free Software Foundation,
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import java.awt.EventQueue;
import java.awt.Rectangle;
import java.awt.event.ActionEvent;
import javax.swing.JTree;
import javax.swing.plaf.basic.BasicTreeUI;
import javax.swing.tree.TreePath;


/* Originally reported as NetBeans bug 222081.
 *
 * @test
 * @bug 8003830
 * @summary NullPointerException in BasicTreeUI.Actions when getPathBounds returns null
 * @author Jaroslav Tulach
 * @run main bug8003830
 */

public class bug8003830 implements Runnable {
    public static void main(String[] args) throws Exception {
        EventQueue.invokeAndWait(new bug8003830());
    }
    @Override
    public void run() {
        testNPEAtActionsPage();
    }

    public void testNPEAtActionsPage() {
        JTree tree = new JTree();
        BasicTreeUI ui = new NullReturningTreeUI();
        tree.setUI(ui);
        BasicTreeUI.TreePageAction tpa = ui.new TreePageAction(0, "down");
        tpa.actionPerformed(new ActionEvent(tree, 0, ""));
    }

    private static final class NullReturningTreeUI extends BasicTreeUI {
        @Override
        public Rectangle getPathBounds(JTree tree, TreePath path) {
            // the method can return null and callers have to be ready for
            // that. Simulate the case by returning null for unknown reason.
            return null;
        }
    }
}