public String appMapString() {
        if (hasGroup()) {
            String appMap = Optional.ofNullable(this.fields.get(TracingConstants.APP_MAP)).orElse("");
            log.debug("App map: {}", appMap);
            return appMap;
        }
        raiseNonGroupException();
        return "{}";
    }
public String appMapString() {
        if (hasGroup()) {
            String appMap = Optional.ofNullable(this.fields.get(TracingConstants.APP_MAP)).orElse("");
            log.debug("App map: {}", appMap);
            return appMap;
        }
        raiseNonGroupException();
        return "{}";
    }
public String appMapString ( ) { if ( hasGroup ( ) ) { String appMap = Optional . ofNullable ( this . fields . get ( TracingConstants . APP_MAP ) ) . orElse ( "" ) ; log . debug ( "App map: {}" , appMap ) ; return appMap ; } raiseNonGroupException ( ) ; return "{}" ; }
String Type App map.

@return appMap
String Type App map .