java - com.fasterxml.jackson.databind.exc.InvalidDefinitionException

Question

我正在尝试使用 spring-boot 和 webclient 调用 Web API。 web api 是 graph ql 的。所以我使用 JsonObject 传递参数，如下所示。

JSONObject variables = new JSONObject();
JSONObject docParam = new JSONObject();
try {
    docParam.put("id", 0);
    docParam.put("name", metadata.get("resourceName"));
    docParam.put("type", metadata.get("Content-Type"));
    docParam.put("datasourceId", 5);

    variables.put("document", docParam);
} catch (Exception e) {
}

LinkedMultiValueMap<String, Object> formData = new LinkedMultiValueMap<String, Object>();
formData.add("query", "mutation ($document: Document, $projectId: Int!) { addDocument { id } }");
formData.add("variables", variables);

WebClient webClient = WebClient.builder().baseUrl("https://localhost:44375/api/graph")
                                    .clientConnector(new ReactorClientHttpConnector(httpClient)).build();

webClient.post().contentType(MediaType.APPLICATION_JSON_UTF8).syncBody(formData).retrieve()
                                    .bodyToMono(String.class).subscribe(response -> {
                                        Extract.saveProcessedFile(response);
                                    });

发送网络客户端调用时出现以下错误。

com.fasterxml.jackson.databind.exc.InvalidDefinitionException: No serializer found for class org.json.JSONObject and no properties discovered to create BeanSerializer (to avoid exception, disable SerializationFeature.FAIL_ON_EMPTY_BEANS) (through reference chain: org.springframework.util.LinkedMultiValueMap["variables"]->java.util.LinkedList[0])

Answer 1

如果您查看以下与您的场景完全匹配的讨论，这看起来像是一个问题。

https://github.com/lukas-krecan/JsonUnit/issues/41

引用如下，

Exception in thread "main" java.lang.IllegalArgumentException: No serializer found for class org.json.JSONObject and no properties discovered to create BeanSerializer (to avoid exception, disable SerializationFeature.FAIL_ON_EMPTY_BEANS)

When using like

JSONObject object = new JSONObject(); object.put("abx","xyz"); JSONObject object1 = new JSONObject(); object1.put("qwe","rty"); CustomMatcher.assertThat(object, JsonMatchers.jsonEquals(object1));

卢卡斯提到应该按照以下声明修复它。

Thanks for feedback. Should be fixed in 1.14.1

我知道这可能无法解决您的问题，仅供您引用。希望您可以使用更高版本进行试用。