Examples of java.awt.HeadlessException

java.awt.HeadlessException
Thrown when code that is dependent on a keyboard, display, or mouse is called in an environment that does not support a keyboard, display, or mouse. @since 1.4 @author Michael Martak

                           PrintRequestAttributeSet dialogAttrs, 
                           Window owner) 
    {
        if (GraphicsEnvironment.isHeadless()) {
            dialogResult = SETUP_ERROR;
            throw new HeadlessException();
        }
    
        if (owner instanceof Frame) {
            printDialog = new JDialog((Frame)owner, "Print", true, gc);
        } else if(owner instanceof Dialog) {

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        dialogType = PAGE_DIALOG;
    
        if (GraphicsEnvironment.isHeadless()) {
            dialogResult = SETUP_ERROR;
            throw new HeadlessException();
        }
    
        if (owner instanceof Frame) {
            printDialog = new JDialog((Frame)owner, "Print", true, gc);
        } else if (owner instanceof Dialog) {

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        return expandsSelectedPaths;
    }


    public void setDragEnabled(boolean enabled) {
        if (enabled && GraphicsEnvironment.isHeadless()) {
            throw new HeadlessException();
        }
        dragEnabled = enabled;
    }

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        }
    }


    public Applet() throws HeadlessException {
        if (GraphicsEnvironment.isHeadless()) {
            throw new HeadlessException();
        }
    }

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     * 
     * Throws HeadlessException if Graphics Environment is headless.
    */
    public boolean printDialog() throws HeadlessException {
        if (GraphicsEnvironment.isHeadless()) {
            throw new HeadlessException();
        }


        if (os.startsWith("Windows")) {         /* Windows OS */
            
            /* call Windows native dialog */

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            throws HeadlessException {


        if (dialogAttrs == null) {
            throw new NullPointerException();
        } else if (GraphicsEnvironment.isHeadless()) {
            throw new HeadlessException();
        }


        /* Combine this PrinterJob attrs attribute set and printerAttrs set
           and resolve MediaPrintableArea/MediaMargins conflict if it is 
           needed */

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    */
    public PageFormat pageDialog(PrintRequestAttributeSet arg_attrs)
            throws HeadlessException {


        if (GraphicsEnvironment.isHeadless()) {
            throw new HeadlessException();
        } else if (arg_attrs == null) {
            throw new NullPointerException();
        } else if (getPrintService() == null) {
            JOptionPane.showMessageDialog(KeyboardFocusManager
                    .getCurrentKeyboardFocusManager().getActiveWindow(),

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        }
    }


    public void setDragEnabled(final boolean b) {
        if (GraphicsEnvironment.isHeadless()) {
            throw new HeadlessException();
        }
        isDragEnabled = b; //TODO it may be no enought(some L&F)
        //TODO Really it will not work, because javax.swing.Transfer doesn't
        //provide enough functionality. Appropriate TransferHandler sets by
        // BasicTextUI. But I don't know now, what should I do, if it

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        }
    }


    public static DragSource getDefaultDragSource() {
        if (GraphicsEnvironment.isHeadless()) {
            throw new HeadlessException();
        }


        if (defaultSource == null) {
            defaultSource = new DragSource();
        }

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        return threshold;
    }


    public DragSource() throws HeadlessException {
        if (GraphicsEnvironment.isHeadless()) {
            throw new HeadlessException();
        }


        dragSourceListeners = new ListenerList<DragSourceListener>();
        dragSourceMotionListeners = new ListenerList<DragSourceMotionListener>();
    }

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