订阅 MailChimp 列表：不支持内容类型“”答案

【问题标题】：Subscribing to MailChimp list: Content Type '' not supported订阅 MailChimp 列表：不支持内容类型“”
【发布时间】：2019-11-11 11:35:12
【问题描述】：

我正在尝试通过 Java SpringBoot 订阅，但我遇到了一个问题，我很难弄清楚为什么会这样。

public class MailChimpLogic implements ISubscribeLogic {
    private final WebClient.Builder builder = WebClient.builder();

    public ResponseEntity subscribe(MailChimpModelRequest request) {
        String baseUri = "https://us7.api.mailchimp.com/3.0/lists/***";
        String username = "***";
        String token = "****-us7";

        MailChimpResponse userSubscribed = builder.build()
                .post()
                .uri(baseUri)
                .header("Authorization", "Basic " + Base64Utils
                        .encodeToString((username + ":" + token).getBytes(UTF_8)))
                .body(BodyInserters.fromObject(request))
                .retrieve()
                .bodyToMono(MailChimpResponse.class)
                .doOnError( e -> {
                    e.printStackTrace();
                    System.out.println("something happend" + e);
                })
                .block();


        return new ResponseEntity(userSubscribed, HttpStatus.OK);
    }
}

我尝试添加

.contentType(MediaType.APPLICATION_JSON)
.accept( MediaType.ALL ) // I tried to use this one by one

我什至尝试使用APPLICATION_JSON_UTF8 作为内容类型，但没有成功。

这是堆栈跟踪：

2019-06-30 14:59:26.070  INFO 28120 --- [           main] ros.config.Application                   : Started Application in 7.696 seconds (JVM running for 8.956)
2019-06-30 14:59:37.567  INFO 28120 --- [nio-8090-exec-2] o.a.c.c.C.[Tomcat].[localhost].[/api]    : Initializing Spring FrameworkServlet 'dispatcherServlet'
2019-06-30 14:59:37.567  INFO 28120 --- [nio-8090-exec-2] o.s.web.servlet.DispatcherServlet        : FrameworkServlet 'dispatcherServlet': initialization started
2019-06-30 14:59:37.588  INFO 28120 --- [nio-8090-exec-2] o.s.web.servlet.DispatcherServlet        : FrameworkServlet 'dispatcherServlet': initialization completed in 21 ms
org.springframework.web.reactive.function.UnsupportedMediaTypeException: Content type '' not supported
    at org.springframework.web.reactive.function.BodyInserters.lambda$null$11(BodyInserters.java:329)
    at java.util.Optional.orElseGet(Optional.java:267)
    at org.springframework.web.reactive.function.BodyInserters.lambda$bodyInserterFor$12(BodyInserters.java:325)
    at org.springframework.web.reactive.function.client.DefaultClientRequestBuilder$BodyInserterRequest.writeTo(DefaultClientRequestBuilder.java:243)
    at org.springframework.web.reactive.function.client.ExchangeFunctions$DefaultExchangeFunction.lambda$exchange$0(ExchangeFunctions.java:80)
    at org.springframework.http.client.reactive.ReactorClientHttpConnector.lambda$connect$1(ReactorClientHttpConnector.java:74)
    at reactor.ipc.netty.http.client.HttpClient.lambda$handler$4(HttpClient.java:429)
    at reactor.ipc.netty.http.client.MonoHttpClientResponse$HttpClientHandler.apply(MonoHttpClientResponse.java:121)
    at reactor.ipc.netty.http.client.MonoHttpClientResponse$HttpClientHandler.apply(MonoHttpClientResponse.java:84)
    at reactor.ipc.netty.channel.ChannelOperations.applyHandler(ChannelOperations.java:380)
    at reactor.ipc.netty.http.client.HttpClientOperations.onHandlerStart(HttpClientOperations.java:505)
    at io.netty.util.concurrent.AbstractEventExecutor.safeExecute$$$capture(AbstractEventExecutor.java:163)
    at io.netty.util.concurrent.AbstractEventExecutor.safeExecute(AbstractEventExecutor.java)
    at io.netty.util.concurrent.SingleThreadEventExecutor.runAllTasks(SingleThreadEventExecutor.java:404)
    at io.netty.channel.nio.NioEventLoop.run(NioEventLoop.java:446)
    at io.netty.util.concurrent.SingleThreadEventExecutor$5.run(SingleThreadEventExecutor.java:884)
    at java.lang.Thread.run(Thread.java:748)
something happendorg.springframework.web.reactive.function.UnsupportedMediaTypeException: Content type '' not supported
2019-06-30 14:59:45.829 ERROR 28120 --- [nio-8090-exec-2] o.a.c.c.C.[.[.[.[dispatcherServlet]      : Servlet.service() for servlet [dispatcherServlet] in context with path [/api] threw exception [Request processing failed; nested exception is org.springframework.web.reactive.function.UnsupportedMediaTypeException: Content type '' not supported] with root cause

org.springframework.web.reactive.function.UnsupportedMediaTypeException: Content type '' not supported
    at org.springframework.web.reactive.function.BodyInserters.lambda$null$11(BodyInserters.java:329) ~[spring-webflux-5.0.9.RELEASE.jar:5.0.9.RELEASE]
    at java.util.Optional.orElseGet(Optional.java:267) ~[na:1.8.0_201]
    at org.springframework.web.reactive.function.BodyInserters.lambda$bodyInserterFor$12(BodyInserters.java:325) ~[spring-webflux-5.0.9.RELEASE.jar:5.0.9.RELEASE]
    at org.springframework.web.reactive.function.client.DefaultClientRequestBuilder$BodyInserterRequest.writeTo(DefaultClientRequestBuilder.java:243) ~[spring-webflux-5.0.9.RELEASE.jar:5.0.9.RELEASE]
    at org.springframework.web.reactive.function.client.ExchangeFunctions$DefaultExchangeFunction.lambda$exchange$0(ExchangeFunctions.java:80) ~[spring-webflux-5.0.9.RELEASE.jar:5.0.9.RELEASE]
    at org.springframework.http.client.reactive.ReactorClientHttpConnector.lambda$connect$1(ReactorClientHttpConnector.java:74) ~[spring-web-5.0.9.RELEASE.jar:5.0.9.RELEASE]
    at reactor.ipc.netty.http.client.HttpClient.lambda$handler$4(HttpClient.java:429) ~[reactor-netty-0.7.9.RELEASE.jar:0.7.9.RELEASE]
    at reactor.ipc.netty.http.client.MonoHttpClientResponse$HttpClientHandler.apply(MonoHttpClientResponse.java:121) ~[reactor-netty-0.7.9.RELEASE.jar:0.7.9.RELEASE]
    at reactor.ipc.netty.http.client.MonoHttpClientResponse$HttpClientHandler.apply(MonoHttpClientResponse.java:84) ~[reactor-netty-0.7.9.RELEASE.jar:0.7.9.RELEASE]
    at reactor.ipc.netty.channel.ChannelOperations.applyHandler(ChannelOperations.java:380) ~[reactor-netty-0.7.9.RELEASE.jar:0.7.9.RELEASE]
    at reactor.ipc.netty.http.client.HttpClientOperations.onHandlerStart(HttpClientOperations.java:505) ~[reactor-netty-0.7.9.RELEASE.jar:0.7.9.RELEASE]
    at io.netty.util.concurrent.AbstractEventExecutor.safeExecute$$$capture(AbstractEventExecutor.java:163) ~[netty-common-4.1.29.Final.jar:4.1.29.Final]
    at io.netty.util.concurrent.AbstractEventExecutor.safeExecute(AbstractEventExecutor.java) ~[netty-common-4.1.29.Final.jar:4.1.29.Final]
    at io.netty.util.concurrent.SingleThreadEventExecutor.runAllTasks(SingleThreadEventExecutor.java:404) ~[netty-common-4.1.29.Final.jar:4.1.29.Final]
    at io.netty.channel.nio.NioEventLoop.run(NioEventLoop.java:446) ~[netty-transport-4.1.29.Final.jar:4.1.29.Final]
    at io.netty.util.concurrent.SingleThreadEventExecutor$5.run(SingleThreadEventExecutor.java:884) ~[netty-common-4.1.29.Final.jar:4.1.29.Final]
    at java.lang.Thread.run(Thread.java:748) [na:1.8.0_201]
    Suppressed: java.lang.Exception: #block terminated with an error
        at reactor.core.publisher.BlockingSingleSubscriber.blockingGet(BlockingSingleSubscriber.java:93) ~[reactor-core-3.1.9.RELEASE.jar:3.1.9.RELEASE]
        at reactor.core.publisher.Mono.block(Mono.java:1183) ~[reactor-core-3.1.9.RELEASE.jar:3.1.9.RELEASE]
        at ros.logic.MailChimpLogic.subscribe(MailChimpLogic.java:38) ~[classes/:na]
        at ros.controllers.SubscribeController.MailSubscribe(SubscribeController.java:20) ~[classes/:na]
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[na:1.8.0_201]
        at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) ~[na:1.8.0_201]
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[na:1.8.0_201]
        at java.lang.reflect.Method.invoke(Method.java:498) ~[na:1.8.0_201]
        at org.springframework.web.method.support.InvocableHandlerMethod.doInvoke(InvocableHandlerMethod.java:209) ~[spring-web-5.0.9.RELEASE.jar:5.0.9.RELEASE]
        at org.springframework.web.method.support.InvocableHandlerMethod.invokeForRequest(InvocableHandlerMethod.java:136) ~[spring-web-5.0.9.RELEASE.jar:5.0.9.RELEASE]
        at org.springframework.web.servlet.mvc.method.annotation.ServletInvocableHandlerMethod.invokeAndHandle(ServletInvocableHandlerMethod.java:102) ~[spring-webmvc-5.0.9.RELEASE.jar:5.0.9.RELEASE]
        at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.invokeHandlerMethod(RequestMappingHandlerAdapter.java:891) ~[spring-webmvc-5.0.9.RELEASE.jar:5.0.9.RELEASE]
        at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.handleInternal(RequestMappingHandlerAdapter.java:797) ~[spring-webmvc-5.0.9.RELEASE.jar:5.0.9.RELEASE]
        at org.springframework.web.servlet.mvc.method.AbstractHandlerMethodAdapter.handle(AbstractHandlerMethodAdapter.java:87) ~[spring-webmvc-5.0.9.RELEASE.jar:5.0.9.RELEASE]
        at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:991) ~[spring-webmvc-5.0.9.RELEASE.jar:5.0.9.RELEASE]
        at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:925) ~[spring-webmvc-5.0.9.RELEASE.jar:5.0.9.RELEASE]
        at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:974) ~[spring-webmvc-5.0.9.RELEASE.jar:5.0.9.RELEASE]
        at org.springframework.web.servlet.FrameworkServlet.doPost(FrameworkServlet.java:877) ~[spring-webmvc-5.0.9.RELEASE.jar:5.0.9.RELEASE]
        at javax.servlet.http.HttpServlet.service(HttpServlet.java:661) ~[tomcat-embed-core-8.5.34.jar:8.5.34]
        at org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:851) ~[spring-webmvc-5.0.9.RELEASE.jar:5.0.9.RELEASE]
        at javax.servlet.http.HttpServlet.service(HttpServlet.java:742) ~[tomcat-embed-core-8.5.34.jar:8.5.34]
        at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:231) ~[tomcat-embed-core-8.5.34.jar:8.5.34]
        at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) ~[tomcat-embed-core-8.5.34.jar:8.5.34]
        at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52) ~[tomcat-embed-websocket-8.5.34.jar:8.5.34]
        at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193) ~[tomcat-embed-core-8.5.34.jar:8.5.34]
        at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) ~[tomcat-embed-core-8.5.34.jar:8.5.34]
        at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:320) ~[spring-security-web-5.0.8.RELEASE.jar:5.0.8.RELEASE]
        at org.springframework.security.web.access.intercept.FilterSecurityInterceptor.invoke(FilterSecurityInterceptor.java:127) ~[spring-security-web-5.0.8.RELEASE.jar:5.0.8.RELEASE]
        at org.springframework.security.web.access.intercept.FilterSecurityInterceptor.doFilter(FilterSecurityInterceptor.java:91) ~[spring-security-web-5.0.8.RELEASE.jar:5.0.8.RELEASE]
        at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:334) ~[spring-security-web-5.0.8.RELEASE.jar:5.0.8.RELEASE]
        at org.springframework.security.web.access.ExceptionTranslationFilter.doFilter(ExceptionTranslationFilter.java:119) ~[spring-security-web-5.0.8.RELEASE.jar:5.0.8.RELEASE]
        at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:334) ~[spring-security-web-5.0.8.RELEASE.jar:5.0.8.RELEASE]
        at org.springframework.security.web.session.SessionManagementFilter.doFilter(SessionManagementFilter.java:137) ~[spring-security-web-5.0.8.RELEASE.jar:5.0.8.RELEASE]
        at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:334) ~[spring-security-web-5.0.8.RELEASE.jar:5.0.8.RELEASE]
        at org.springframework.security.web.authentication.AnonymousAuthenticationFilter.doFilter(AnonymousAuthenticationFilter.java:111) ~[spring-security-web-5.0.8.RELEASE.jar:5.0.8.RELEASE]
        at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:334) ~[spring-security-web-5.0.8.RELEASE.jar:5.0.8.RELEASE]
        at org.springframework.security.web.servletapi.SecurityContextHolderAwareRequestFilter.doFilter(SecurityContextHolderAwareRequestFilter.java:170) ~[spring-security-web-5.0.8.RELEASE.jar:5.0.8.RELEASE]
        at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:334) ~[spring-security-web-5.0.8.RELEASE.jar:5.0.8.RELEASE]
        at org.springframework.security.web.savedrequest.RequestCacheAwareFilter.doFilter(RequestCacheAwareFilter.java:63) ~[spring-security-web-5.0.8.RELEASE.jar:5.0.8.RELEASE]
        at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:334) ~[spring-security-web-5.0.8.RELEASE.jar:5.0.8.RELEASE]
        at org.springframework.security.web.authentication.logout.LogoutFilter.doFilter(LogoutFilter.java:116) ~[spring-security-web-5.0.8.RELEASE.jar:5.0.8.RELEASE]
        at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:334) ~[spring-security-web-5.0.8.RELEASE.jar:5.0.8.RELEASE]
        at org.springframework.security.web.header.HeaderWriterFilter.doFilterInternal(HeaderWriterFilter.java:66) ~[spring-security-web-5.0.8.RELEASE.jar:5.0.8.RELEASE]
        at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107) ~[spring-web-5.0.9.RELEASE.jar:5.0.9.RELEASE]
        at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:334) ~[spring-security-web-5.0.8.RELEASE.jar:5.0.8.RELEASE]
        at org.springframework.security.web.context.SecurityContextPersistenceFilter.doFilter(SecurityContextPersistenceFilter.java:105) ~[spring-security-web-5.0.8.RELEASE.jar:5.0.8.RELEASE]
        at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:334) ~[spring-security-web-5.0.8.RELEASE.jar:5.0.8.RELEASE]
        at org.springframework.security.web.context.request.async.WebAsyncManagerIntegrationFilter.doFilterInternal(WebAsyncManagerIntegrationFilter.java:56) ~[spring-security-web-5.0.8.RELEASE.jar:5.0.8.RELEASE]
        at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107) ~[spring-web-5.0.9.RELEASE.jar:5.0.9.RELEASE]
        at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:334) ~[spring-security-web-5.0.8.RELEASE.jar:5.0.8.RELEASE]
        at org.springframework.security.web.FilterChainProxy.doFilterInternal(FilterChainProxy.java:215) ~[spring-security-web-5.0.8.RELEASE.jar:5.0.8.RELEASE]
        at org.springframework.security.web.FilterChainProxy.doFilter(FilterChainProxy.java:178) ~[spring-security-web-5.0.8.RELEASE.jar:5.0.8.RELEASE]
        at org.springframework.web.filter.DelegatingFilterProxy.invokeDelegate(DelegatingFilterProxy.java:357) ~[spring-web-5.0.9.RELEASE.jar:5.0.9.RELEASE]
        at org.springframework.web.filter.DelegatingFilterProxy.doFilter(DelegatingFilterProxy.java:270) ~[spring-web-5.0.9.RELEASE.jar:5.0.9.RELEASE]
        at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193) ~[tomcat-embed-core-8.5.34.jar:8.5.34]
        at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) ~[tomcat-embed-core-8.5.34.jar:8.5.34]
        at org.springframework.web.filter.RequestContextFilter.doFilterInternal(RequestContextFilter.java:99) ~[spring-web-5.0.9.RELEASE.jar:5.0.9.RELEASE]
        at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107) ~[spring-web-5.0.9.RELEASE.jar:5.0.9.RELEASE]
        at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193) ~[tomcat-embed-core-8.5.34.jar:8.5.34]
        at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) ~[tomcat-embed-core-8.5.34.jar:8.5.34]
        at org.springframework.web.filter.HttpPutFormContentFilter.doFilterInternal(HttpPutFormContentFilter.java:109) ~[spring-web-5.0.9.RELEASE.jar:5.0.9.RELEASE]
        at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107) ~[spring-web-5.0.9.RELEASE.jar:5.0.9.RELEASE]
        at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193) ~[tomcat-embed-core-8.5.34.jar:8.5.34]
        at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) ~[tomcat-embed-core-8.5.34.jar:8.5.34]
        at org.springframework.web.filter.HiddenHttpMethodFilter.doFilterInternal(HiddenHttpMethodFilter.java:93) ~[spring-web-5.0.9.RELEASE.jar:5.0.9.RELEASE]
        at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107) ~[spring-web-5.0.9.RELEASE.jar:5.0.9.RELEASE]
        at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193) ~[tomcat-embed-core-8.5.34.jar:8.5.34]
        at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) ~[tomcat-embed-core-8.5.34.jar:8.5.34]
        at org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:200) ~[spring-web-5.0.9.RELEASE.jar:5.0.9.RELEASE]
        at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107) ~[spring-web-5.0.9.RELEASE.jar:5.0.9.RELEASE]
        at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193) ~[tomcat-embed-core-8.5.34.jar:8.5.34]
        at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) ~[tomcat-embed-core-8.5.34.jar:8.5.34]
        at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:198) ~[tomcat-embed-core-8.5.34.jar:8.5.34]
        at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:96) [tomcat-embed-core-8.5.34.jar:8.5.34]
        at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:493) [tomcat-embed-core-8.5.34.jar:8.5.34]
        at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:140) [tomcat-embed-core-8.5.34.jar:8.5.34]
        at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:81) [tomcat-embed-core-8.5.34.jar:8.5.34]
        at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:87) [tomcat-embed-core-8.5.34.jar:8.5.34]
        at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:342) [tomcat-embed-core-8.5.34.jar:8.5.34]
        at org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:800) [tomcat-embed-core-8.5.34.jar:8.5.34]
        at org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:66) [tomcat-embed-core-8.5.34.jar:8.5.34]
        at org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:806) [tomcat-embed-core-8.5.34.jar:8.5.34]
        at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1498) [tomcat-embed-core-8.5.34.jar:8.5.34]
        at org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:49) [tomcat-embed-core-8.5.34.jar:8.5.34]
        at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149) [na:1.8.0_201]
        at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624) [na:1.8.0_201]
        at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61) [tomcat-embed-core-8.5.34.jar:8.5.34]
        ... 1 common frames omitted

MailChimpResponse.class

public class MailChimpResponse { // here is the response
    List<MailChimpNewMember> new_members;
    int total_created;
    int total_updated;
    int error_count;
}

MailChimpNewMember.class

public class MailChimpNewMember {
    String id;
    String email_address;
    String unique_email_id;
    String email_type;
    String status;
    MailChimpMergeFields merge_fields;
    MailChimpStats stats;
    String ip_signup;
    String timestamp_signup;
    String ip_opt;
    Date timestamp_opt;
    int member_rating;
    Date last_changed;
    String language;
    boolean vip;
    String email_client;
    MailChimpLocation location;
    int tags_count;
    String list_id;
}

MailChimpStats.class

public class MailChimpStats {
    int avg_open_rate;
    int avg_click_rate;
}

MailChimpLocation.class

public class MailChimpLocation {
    int latitude;
    int longitude;
    int gmtoff;
    int dstoff;
    String country_code;
    String timezone;
}

MailChimpModelRequest.class

public class MailChimpModelRequest {// here is the request
    private List<MailChimpMember> members;
}

MailChimpMergeFields.class

public class MailChimpMergeFields {
    private String FNAME;
    private String LNAME;
}

MailChimpMember.class

public class MailChimpMember {
    private String email_address;
    private String status;
    private MailChimpMergeFields merge_fields;
}

【问题讨论】：

你能把MailChimpModelRequest和MailChimpResponse的代码贴出来吗？我的猜测是 Spring 在序列化 MailChimpModelRequest 时遇到问题。
我无法发布更多代码，stackoverflow 给了我帖子包含太多代码的错误，我需要提供有关代码的更多信息。
检查 pastebin 中的模型：pastebin.com/u9TuN385 我删除了几个属性，因为它们不需要并且大部分是空的。有人在回答中告诉我，我需要使用媒体类型 application_json_value 但因此我不能使用对象，或者我可以吗？这是我尝试时它给我的 linting 错误：prntscr.com/o8m9yg
是否可以将对象用作单声道的主体？这能解决问题吗？
你找到对我有用的东西了吗？ @Trein

标签： java spring mailchimp spring-webflux mailchimp-api-v3.0

【解决方案1】：

在 SO 成员 @Trein 的帮助下，我发现了 2 个主要问题。

第一个问题是我的请求是空的，这是因为模型缺少 getter、setter 和构造函数。

接下来我用了

       .contentType(MediaType.APPLICATION_JSON)
       .syncBody(request)

这是为了确保应用程序类型已设置并且正文已自动同步。

在最后一部分，我检查了我的请求，它错误地命名了 json 属性。 Spring Boot 需要 Camel Cased Json 名称，为了改变这一点，我使用了注释 @JsonProperty("New-Value")

一切都像魅力一样发挥作用！

【讨论】：