Headless environment error in java.awt.Robot class with MAC OS

Question

I am trying to capture screen shots in my JavaFX application using Robot class,

this is the code which I used in my application:

Rectangle screenBounds = new Rectangle(Screen.getPrimary().getBounds().getWidth(),
           Screen.getPrimary().getBounds().getHeight());

Robot robot = new Robot();

BufferedImage img = robot.createScreenCapture(new java.awt.Rectangle(
     (int) screenBounds.getX(), (int) screenBounds.getY(), (int) 
             screenBounds.getWidth(), (int) screenBounds.getHeight()));

It is working perfectly in windows operating system, but showing an error of headless environment in MAC OS at Robot robot = new Robot();

java.awt.AWTException: headless environment at Robot robot = new Robot(); — Shreyas Dave, Nov 21 '12 at 06:00
java version "1.6.0_37" Java(TM) SE Runtime Environment (build 1.6.0_37-b06-434-11M3909) Java HotSpot(TM) 64-Bit Server VM (build 20.12-b01-434, mixed mode) — Shreyas Dave, Nov 24 '12 at 05:32

score 32 · Accepted Answer · answered Nov 26 '12 at 06:03

32

This is to answer my own question, after searching many resources.

I have used following code to disable headless environment, and the problem is solved.

static {

        System.setProperty("java.awt.headless", "false");
}

Thanks.

answered Nov 26 '12 at 06:03

Shreyas Dave

3,815
3
28
57

did this work in headless environment ? – Phani Kiran Gutha Dec 16 '21 at 12:51

score 3 · Answer 2 · answered Nov 21 '12 at 07:19

From their API I can see the following:

The constructors of Applet and all heavyweight components (*) are changed to throw HeadlessException if a display, keyboard, and mouse are not supported by the toolkit implementation
The Robot constructor throws an AWTException if a display, keyboard, and mouse are not supported by the toolkit implementation
Many of the methods in Toolkit and GraphicsEnvironment, with the exception of fonts, imaging, and printing, are changed to throw HeadlessException if a display, keyboard, and mouse are not supported
Other methods that may be affected by lack of display, keyboard, or mouse support, are changed to throw HeadlessException
It should be worth noting that the HeadlessException is thrown if and only if isHeadless returns true, and that all javadoc comments should specify this

So you need to check your hardware and their drivers.

score 2 · Answer 3 · answered May 04 '21 at 07:38

2

You can simply add this line of code System.setProperty("java.awt.headless", "false"); before the Robot robot = new Robot();.

answered May 04 '21 at 07:38

Anass Ibrahimi

31
1

Headless environment error in java.awt.Robot class with MAC OS

3 Answers3

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