awt - Is there a way to get screenshot of the windows when it is locked using java? -

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i'm using below code take screenshot of window, returns blank image when computer locked (alt + ctrl + del & lock)

is there anyway can take screenshot on locked computer using java.. appreciated 

 public void takeascreenshot() throws awtexception, ioexception   {               dimension screendimn = toolkit.getdefaulttoolkit().getscreensize();         rectangle screenboundary = new rectangle(0, 0, screendimn.width, screendimn.height);          robot robot = new robot();         bufferedimage image =  robot.createscreencapture(screenboundary);          file printscreenfile = new file("image" + system.currenttimemillis() + ".png");         imageio.write(image, "png", printscreenfile);     }

there no way capture using java (at least not know of). reason being when computer locked nothing being rendered robot capture.

there might way using c / c++ same glitchy.

what did use caffeine keep screen locking when executing long runs on remote machine.


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