@Componentpublic class BeetlErrorViewResolver implements ErrorViewResolver {	private static final Map
     
       SERIES_VIEWS;	@Value("${beetl.templatesPath:templates}")	String templatesPath;	@Value("${beetl.suffix:btl}")	String suffix;	private static ArrayList
      
        errorFiles = new ArrayList
       
        ();	public void getErrorFiles() {		if (errorFiles.isEmpty()) {			String path = BeetlErrorViewResolver.class.getClassLoader().getResource("").getFile();			File templates = new File(path + templatesPath + "/error");			File[] files = templates.listFiles();			for (File file : files) {				if (file.isFile())					errorFiles.add(file.getName());			}		}	}	static {		Map
        
          views = new EnumMap<>(Series.class);		views.put(Series.CLIENT_ERROR, "4xx");		views.put(Series.SERVER_ERROR, "5xx");		SERIES_VIEWS = Collections.unmodifiableMap(views);	}	@Override	public ModelAndView resolveErrorView(HttpServletRequest request, HttpStatus status, Map
         
           model) {		ModelAndView modelAndView = resolve(String.valueOf(status), model);		if (modelAndView == null && SERIES_VIEWS.containsKey(status.series())) {			modelAndView = resolve(SERIES_VIEWS.get(status.series()), model);		}		return modelAndView;	}	private ModelAndView resolve(String viewName, Map
          
            model) { viewName = viewName + "." + suffix; getErrorFiles(); try { for (String error : errorFiles) { if (error.equals(viewName)) return new ModelAndView("/error/" + viewName, model); } } catch (Exception ex) { } return null; }}