#vulnerable code 
                                private Long getRequestStartTime() {
        RequestAttributes requestAttributes = RequestContextHolder.getRequestAttributes();
        return (Long) requestAttributes.getAttribute(REQUEST_START_TIME, SCOPE_REQUEST);
    } 
                            #location 3 
                            #vulnerability type NULL_DEREFERENCE
#fixed code
                                private Long getRequestStartTime() {
        final RequestContext ctx = RequestContext.getCurrentContext();
        final HttpServletRequest request = ctx.getRequest();
        return (Long) request.getAttribute(REQUEST_START_TIME);
    }