If some race condition causes the graphical view to try and paint when
the data hasn't been filled in yet, JVM hangs or crashes. It seems which one it does depends on the AffineTransform being used at the time. A transform of
[-1,-1] results in a crash; [1,1], a hang.

The program below (CrashVM2.java) takes an argument of either "-crash" or "-hang":


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import java.awt.Color;
import java.awt.Dimension;
import java.awt.Graphics2D;
import java.awt.Graphics;
import java.awt.RenderingHints;
import java.awt.geom.*;
import java.awt.image.BufferedImage;
import java.util.Date;
import javax.swing.JFrame;
import javax.swing.JPanel;

public class CrashVM2 extends JPanel {

    CubicCurve2D.Double s1 = null;
    static boolean crash = false;

    public static void main(String[] args) {
        if (args.length != 1) {
            usage();
        }
        if (args[0].equals("-crash")) {
            crash = true;
        } else if (args[0].equals("-hang")) {
            crash = false;
        } else {
            usage();
        }
        JFrame f = new JFrame();
        f.getContentPane().add(new CrashVM2());
        f.setSize(640, 480);
        f.setVisible(true);
    }

    public static void usage() {
        System.out.println("Usage: CrashVM2 [-crash | -hang ]");
        System.exit(1);
    }
    
    
    public CrashVM2() {
        s1 = new CubicCurve2D.Double();
        s1.setCurve(1.0, 1.0,
                   Double.NaN, Double.NaN,
                   Double.NaN, Double.NaN,
                   0.0, 0.0);
    }
    
    public void paintComponent(Graphics g) {
        Graphics2D g2 = (Graphics2D) g;
        g2.setRenderingHint(RenderingHints.KEY_ANTIALIASING,
                             RenderingHints.VALUE_ANTIALIAS_ON);
        System.out.println("About to draw...");
        AffineTransform oldTransform = g2.getTransform();
        AffineTransform downRight = (AffineTransform) oldTransform.clone();
        AffineTransform upLeft = (AffineTransform) oldTransform.clone();
        downRight.translate(1.0,1.0);
        upLeft.translate(-1.0,-1.0);
        g2.setTransform(crash ? upLeft : downRight);
        g2.draw(s1);
        g2.setTransform(oldTransform);
        System.out.println("Done --> " + new Date().toString());
    }

}

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