FacesContext facesContext = FacesContext.getCurrentInstance();
ViewHandler viewHandler = facesContext.getApplication().getViewHandler();
String actionUrl = viewHandler.getActionURL(facesContext, viewId);
String javaScriptText = "window.open('"+actionUrl+"', '_blank');";
JavascriptContext.addJavascriptCall(FacesContext.getCurrentInstance(), javaScriptText);
Muy util Adriana Gracias.
ResponderEliminarSalu2.