Getting java.awt.HeadlessException in Java code-CodePudding

Trying to run the code below and I am getting java.awt.HeadlessException. Not getting where is the issue.

public void uploadFile(String filename) throws Exception {
        clickOnAddFilesAndComment();
        WaitActions.waitForElementToBeClickable(driver, uploadButton, Utils.EXPLICIT_WAIT_VALUE_LONG);
        uploadButton.click();

        WaitActions.wait(4000);
        String testDataPath = "\\src\\test\\resources\\testFiles\\";
        String uploadPath = System.getProperty("user.dir")   testDataPath   filename;
        System.out.println(uploadPath);

        StringSelection str = new StringSelection(uploadPath);
        Toolkit.getDefaultToolkit().getSystemClipboard().setContents(str, null);

        // uploadButton.sendKeys(uploadPath);
        Robot r = new Robot();
        // pressing enter
        r.keyPress(KeyEvent.VK_CONTROL);
        // releasing enter
        r.keyPress(KeyEvent.VK_V);
        // pressing ctrl v
        r.keyRelease(KeyEvent.VK_V);
        r.keyPress(KeyEvent.VK_CONTROL);
        // releasing ctrl v
        r.keyRelease(KeyEvent.VK_CONTROL);
        // pressing enter
        r.keyPress(KeyEvent.VK_ENTER);

        WaitActions.wait(Utils.LONG_WAIT_DEFAULT_MILLS);

        commentTextArea.sendKeys("test_"   filename);
        WaitActions.waitForElementToBeClickable(driver, commentButton, Utils.EXPLICIT_WAIT_VALUE_LONG);
        commentButton.click();
        WaitActions.wait(Utils.LONG_WAIT_DEFAULT_MILLS);
    }

I am getting the following error:

java.awt.HeadlessException
    at java.desktop/sun.awt.HeadlessToolkit.getSystemClipboard(HeadlessToolkit.java:216)
    at pageObjects.ShareHolderInputScreenPage.uploadFile(ShareHolderInputScreenPage.java:725)
    at stepDefinitions.ShareHolderInputScreenStepDefinitions.uploadFileAndComments(ShareHolderInputScreenStepDefinitions.java:338)
    at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
    at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)

Not getting what headless toolkit is been passed. I tried to debug the upload path but it is taking proper value. Tested that manually as well as whether that upload path is working or not.

CodePudding user response：

according to documentation

A HeadlessException is thrown when code that depends on a display device, keyboard, or mouse is called in an environment that does not support any of these

try to execute when headless mode is False