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


  public VersionEditor() throws HeadlessException {
    super();


    if(CurrentVersion.fromJar())
      throw new HeadlessException("You may not run the version editor from a JAR");


    setTitle("BNU-Bot Version Editor");


    initializeGui();

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        }
        // Declaring the argument as Object rather than Component avoids class not
        // found errors on phoneME foundation profile.
        static long getComponentID(Object o) throws HeadlessException {
            if (GraphicsEnvironment.isHeadless()) {
                throw new HeadlessException("No native windows when headless");
            }
            Component c = (Component)o;
            if (c.isLightweight()) {
                throw new IllegalArgumentException("Component must be heavyweight");
            }

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        }
        // Declaring the argument as Object rather than Component avoids class not
        // found errors on phoneME foundation profile.
        static long getComponentID(Object o) throws HeadlessException {
            if (GraphicsEnvironment.isHeadless()) {
                throw new HeadlessException("No native windows when headless");
            }
            Component c = (Component)o;
            if (c.isLightweight()) {
                throw new IllegalArgumentException("Component must be heavyweight");
            }

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        setColor(new Color(c));
    }
    
    public void setDragEnabled(final boolean b) {
        if (b && GraphicsEnvironment.isHeadless()) {
            throw new HeadlessException();
        }
        dragEnabled = b;
    }

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    DropTargetAutoScroller autoScroller;


    public DropTarget(Component c, int ops, DropTargetListener dtl, 
            boolean act, FlavorMap fm) throws HeadlessException {
        if (GraphicsEnvironment.isHeadless()) {
            throw new HeadlessException();
        }
        context = createDropTargetContext();
        setDefaultActionsImpl(ops);
        active = (c != null) ? act : true;
        dropTargetListener = dtl;

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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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        }
    }


    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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        return (TableCellEditor)getClosestClass(columnClass, defaultEditorsByColumnClass);
    }


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

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        return cellRenderer;
    }


    public void setDragEnabled(final boolean dragEnabled) {
        if (dragEnabled && GraphicsEnvironment.isHeadless()) {
            throw new HeadlessException("DnD could not be used in headless environment");
        }


        this.dragEnabled = dragEnabled;
    }

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