improved integration with view-controller

@ExceptionHandler
public class ErrorViewAwareExceptionHandler {
    @Inject
    private ViewConfigResolver viewConfigResolver;

    public void onIllegalStateException(@Handles ExceptionEvent<IllegalStateException> e)
    {
        FacesContext facesContext = FacesContext.getCurrentInstance();

        String viewId = viewConfigResolver.getDefaultErrorViewConfigDescriptor().getViewId();
        UIViewRoot viewRoot = facesContext.getApplication().getViewHandler().createView(facesContext, viewId);
        facesContext.setViewRoot(viewRoot);
        //... - e.g.: store the exception in a page-bean for the default-error-view
    }
}

    @ErrorView(forException = {IllegalStateException.class})
    class Error extends DefaultErrorView {}