带有嵌套投影的 UriBuilder 失败，java.lang.IllegalArgumentException map has no value for “,shares{id,link”

如何解决带有嵌套投影的 UriBuilder 失败，java.lang.IllegalArgumentException map has no value for “,shares{id,link”

我有一个用例来从 FB 图形 API 中获取消息的现有 share 元数据，并且我正在使用字段 fields=updated_time,messages{message,id,created_time,from,to,tags,attachments,shares{id,link}

现有实施： 对于此网址 https://graph.facebook.com/v5.0/me/conversations?fields=updated_time,sticker} 我们将值插入到 BuilderMap 中，如下所示，工作正常

builderMap.put("message,sticker","{message,sticker}");

UriBuilder builder =  new DefaultUriBuilderFactory(baseURL).builder();
uri = builder.build(builderMap);

webClient.get()
    .uri(uri)
    .retrieve()
    .onStatus(HttpStatus::isError,(clientResponse) -> {
            return this.handleError(clientResponse,errorType,exceptionTransformer);
    }).bodyToMono(responseType).block();

新实施：

uriBuilderMap.put("message,sticker,link}",link}}");

uriBuilderMap.put("id,link","{id,link}");
UriBuilder builder =  new DefaultUriBuilderFactory(baseURL).builder();
uri = builder.build(builderMap);

webClient.get()
    .uri(uri)
    .retrieve()
    .onStatus(HttpStatus::isError,exceptionTransformer);
    }).bodyToMono(responseType).block();

例外：

java.lang.IllegalArgumentException: Map has no value for 'message,link'
    at org.springframework.web.util.UriComponents$MapTemplateVariables.getValue(UriComponents.java:345)
    at org.springframework.web.util.HierarchicalUriComponents$QueryUriTemplateVariables.getValue(HierarchicalUriComponents.java:1055)
    at org.springframework.web.util.UriComponents.expandUriComponent(UriComponents.java:262)
    at org.springframework.web.util.HierarchicalUriComponents.lambda$expandQueryParams$5(HierarchicalUriComponents.java:443)
    at java.util.Map.forEach(Map.java:630)

如何处理这个嵌套的投影https://graph.facebook.com/v5.0/me/conversations?fields=updated_time,link},sticker}？