Developing a mod with 1.15.2, am getting

java.awt.HeadlessException

from 

PointerInfo pointerInfo = MouseInfo.getPointerInfo();

Have been looking at this excellent example: motecraft, although it is out of date, so for 1.15.2 am using the following:

DistExecutor.runWhenOn(Dist.CLIENT, () -> () -> {
    initRobot();
});

void initRobot() {

    try {
        this.robot = new Robot();
    } catch (AWTException e){
        e.printStackTrace();
    }

    PointerInfo pointerInfo = MouseInfo.getPointerInfo();

	DisplayMode mode = pointerInfo.getDevice().getDisplayMode();

	int width = mode.getWidth();
    int height = mode.getHeight();

    this.displayPixels = height < width ? height : width;
}

Have tried many, many variations, but no way to avoid the exception. 

Can anyone indicate whether the Minecraft 1.15.2 client is headless? Or is there something obvious I've missed.

Any info greatly appreciated.

Finally cracked it. In case useful to anyone else, in the client you have to manually clear the headless state:

MyClassConstructor() {

    // ....

    DistExecutor.runWhenOn(Dist.CLIENT, () -> () -> {
        initRobot();
    });
}

void initRobot() {

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

    try {
        this.robot = new Robot();
    } catch (AWTException e){
        e.printStackTrace();
    }

    PointerInfo pointerInfo = MouseInfo.getPointerInfo();

    // you can now use all the usual Robot class methods

}

 

I still get the headless environment error message on forge 1.16.5

any ideas?