background - 为什么这个脚本在后台运行时会失败？

Question

我的代码：

@Keyword    //### upload file from windows explorer     def uploadFile (TestObject to, String filePath) {       WebUI.click(to)         StringSelection ss = new StringSelection(filePath);

    Toolkit.getDefaultToolkit().getSystemClipboard().setContents(ss, null);

    Robot robot = new Robot();      robot.delay(1000)       Thread.sleep(3000)      robot.keyPress(KeyEvent.VK_ENTER);      robot.keyRelease(KeyEvent.VK_ENTER);        robot.autoDelay;        robot.keyPress(KeyEvent.VK_CONTROL);        robot.keyPress(KeyEvent.VK_V);      robot.keyRelease(KeyEvent.VK_V);        robot.keyRelease(KeyEvent.VK_CONTROL);      robot.autoDelay;        robot.keyPress(KeyEvent.VK_ENTER);      robot.keyRelease(KeyEvent.VK_ENTER);    }

如果它不在前台，它将失败。如何让它从后台工作？