Possible Apple JVM bug: java.lang.OutOfMemoryError: Java heap space at apple.awt.CRobot.getRGBPixels(CRobot.java:204)

Question

I'm having issues when I take screenshots. This is my test code.

import java.awt.Robot;
import java.awt.AWTException;
import java.awt.image.BufferedImage;
import java.awt.Rectangle;
import java.awt.Toolkit;
import java.awt.Dimension;

public class Test {
        public static void main(String[] args) throws AWTException {
            Dimension screenSize = Toolkit.getDefaultToolkit().getScreenSize();
            int[] pixels = new int[(int) (screenSize.getWidth() * screenSize.getHeight()) * 3];
            Robot robot = new Robot();
            int i = 0;

            while (true) {
                robot.createScreenCapture(new Rectangle(screenSize))
                     .getRaster().getPixels(0, 0, (int) screenSize.getWidth(), (int) screenSize.getHeight(), pixels);
                System.out.println(++i);
            }
        }
}

On my Mac*s* with OS X 10.6.4 and Java 1.6.0_20-b02-279-10M3065 it fails after two iterations. It seems to work fine on Windows. Can you reproduce this behaviour?

Exception in thread "main" java.lang.OutOfMemoryError: Java heap space at apple.awt.CRobot.getRGBPixels(CRobot.java:204) at java.awt.Robot.createScreenCapture(Robot.java:329) at Test.main(Test.java:16)

Answer 1

OutOfMemory means you need to give the program more memory. This tends to happen on Macs more often these days, since Java is 64bit there now, and needs a bigger heap.