public BackingBean() {
        persistentFacesState = PersistentFacesState.getInstance();
    }

    public String asyncStuff() {
        // Remeber the viewID so we can use it later to restore the view.
        final String viewID = persistentFacesState.getFacesContext().getViewRoot().getViewId();

        Runnable r = new Runnable() {
            public void run() {


                // Here goes my code which must be executed asynchronously



                // Begin of the workaround
                //
                FacesContext facesContext = persistentFacesState.getFacesContext();
                // Create a ViewRoot if it's null
                if (facesContext.getViewRoot() == null) {
                    UIViewRoot viewRoot = facesContext.getApplication().getViewHandler().restoreView(facesContext,
                        viewID);
                    if (viewRoot != null) {
                        facesContext.setViewRoot(viewRoot);
                    }
                }
                // End of the workaround

                try {
                    persistentFacesState.render();
                } catch (RenderingException e) {
                    // TODO Auto-generated catch block
                    e.printStackTrace();
                }

            }
        };

        Thread t = new Thread(r);
        t.start();

        return null;
    }