Mule Esb 3.2.1：收集分离器的结果并将结果输出为XML

Question

我一直在努力通过SO和Mule论坛，但找不到可行的解决方案。 esb接受一个包含id的单个请求，该请求创建一个由相关id列表组成的XML有效载荷。然后将这个XML有效载荷分离并发送到一个转换器，该转换器将每个相关的id获取一些元数据。然后结果应该结合在一起以形成XML响应。我遇到的问题是，无论我如何转换最终结果集，我总是使用封装字符串“?? sr）java.util.concurrent.CopyOnWriteArrayListx]取回文档....”“x

任何想法/意见将不胜感激

这里是我使用的骡子配置：。

---

<http:connector name="HttpConnector" doc:name="HTTP\HTTPS"/> 
<expression-transformer name="ExtractId" doc:name="Expression"> 
    <return-argument evaluator="xpath" expression="//string[1]"/> 
</expression-transformer> 
<flow name="myFlow1" doc:name="myFlow1"> 
    <http:inbound-endpoint exchange-pattern="request-response" host="localhost" port="8081" path="incoming/path/" connector-ref="HttpConnector" doc:name="HTTP"/> 
    <custom-transformer encoding="UTF-8" class="mycomponents.transformers.SubscriberRequestTransformer" doc:name="Create Hub Id Requests"/> 
    <mulexml:object-to-xml-transformer doc:name="Object to XML"/> 

    <splitter evaluator="xpath" expression="//entry/list/string" enableCorrelation="ALWAYS" doc:name="Splitter"/> 
    <transformer ref="ExtractId" doc:name="Transformer Reference"/> 
    <logger message="#[payload:]" level="INFO" doc:name="Logger"/> 
    <custom-transformer encoding="UTF-8" class="mycomponents.transformers.HubQueryProcessor" doc:name="Create Hub Id Requests"/> 
    <collection-aggregator /> 
    <component class="mycomponents.TopicResponseAggregatorComponent" doc:name="Collect requests" /> 
    <logger message="Aggregated Content (#[groovy:payload.size()] elements): \n#[payload:]" level="INFO" doc:name="Logger"/>   
    <logger message="#[payload:]" level="INFO" doc:name="Logger"/> 

</flow> 

---

我已经解决了问题。虽然我不太理解它为什么不同但我假设它与一些骡子的“魔法”有关。我把流量分成多个流量，这是我最终要做的。但是，通过这样做，问题就消失了。

FYI：这里是更新后的流程：

<flow name="myFlow1" doc:name="myFlow1"> 
    <http:inbound-endpoint exchange-pattern="request-response" host="localhost" port="8081" path="url/for/service/" connector-ref="HttpConnector" doc:name="HTTP"/> 
    <flow-ref name="createHubIdRequestsFlow" doc:name="Map To Hub Ids" doc:description="Takes in the situation id passed in by the client. Does the query lookup versus the content mapping tables. creates the correspondng requests for meta data information to the provider(s)"/> 
    <flow-ref name="getTopicRequests" doc:name="Process Provider Reponses" doc:description="For each JSON response returned from the provider, transform it into an XML representation of that data"/> 
    <flow-ref name="buildResponseFlow" doc:name="Build final response" doc:description="piece all the messages together into a single object as a string"/> 

    <response> 
     <message-properties-transformer> 
      <add-message-property value="text/xml" key="Content-Type" /> 
     </message-properties-transformer> 
    </response> 
</flow> 

Answer 1

默认情况下，邮件属性变压器卖场新的属性，在“调用”的范围。您需要在“出站”范围内设置内容类型，以便入站HTTP端点在响应阶段使用它。

试试这个：

<response> 
     <message-properties-transformer scope="outbound"> 
      <add-message-property value="text/xml" key="Content-Type" /> 
     </message-properties-transformer> 
    </response>