private AnnotationBo findAnnotation(List<AnnotationBo> annotationBoList, int key) {
        for (AnnotationBo annotationBo : annotationBoList) {
            if (key == annotationBo.getKey()) {
                return annotationBo;
            }
        }
        return null;
    }
@author emeroad
@author jaehong.kim
@author minwoo.jung
web/src/main/java/com/navercorp/pinpoint/web/service/SpanServiceImpl.java