WSO2 ESB:聚合后聚合节点丢弃消息

我正在代理内部实现扇出扇入拆分器EIP，其中：

                |-----> shoe store-(1-M)-------------
productSearchRq --                                     |-->Rs
                |-----> ack clothes store-(0-1)------

鞋店=数据服务，服装店=Axis 2服务

总之，我实现了上面的模式；我克隆请求，发送请求，获取响应，使用payloadFactory设置格式：

<productDetails>
   <productID>$1</productID>
   <productName>$2</productName>
   <productSize>$3</productSize>
   <productColour>$4</productColour>
   <productType>$5</productType>
   <sourceID>$6</sourceID>
</productDetails>

在鞋产品上的响应和迭代[//productDetails，iterate id=iT]，因为这是一对多。然后在下面的响应处理程序中，我尝试聚合所有这些productDetails

<sequence xmlns="http://ws.apache.org/ns/synapse" name="productSearchHandler">
   <log level="custom">
      <property name="pocSearchRsHandlerSeq reached" value="++++++++++++++=========Aggregating now========+++++++++++++++++=="></property>
   </log>
   <aggregate id="iT">
      <completeCondition>
         <messageCount min="-1" max="-1"></messageCount>
      </completeCondition>
      <onComplete xmlns:ns="http://org.apache.synapse/xsd" expression="//productDetails">
         <log level="custom" separator=",">
            <property name="::::" value="======================= Formatting the Aggregated Responses. ==============="></property>
         </log>
         <log level="full"></log>
      </onComplete>
   </aggregate>
   <aggregate>
      <completeCondition>
         <messageCount min="-1" max="-1"></messageCount>
      </completeCondition>
      <onComplete xmlns:ns="http://org.apache.synapse/xsd" expression="//productDetails">
         <payloadFactory media-type="xml">
            <format>
               <soapenv:Envelope xmlns:soapenv="http://schemas.xmlsoap.org/soap/envelope/" xmlns:prod="http://za.co.pepkor/product_service/">
                  <soapenv:Body>
                     <prod:productSearchResp> $1                                                                                                </prod:productSearchResp>
                  </soapenv:Body>
               </soapenv:Envelope>
            </format>
            <args>
               <arg expression="//productDetails" evaluator="xml"></arg>
            </args>
         </payloadFactory>
         <switch source="get-property('CallType')">
            <case regex="SOAP">
               <send></send>
            </case>
            <case regex="REST">
               <property name="messageType" value="application/json" scope="axis2" type="STRING"></property>
               <send></send>
            </case>
            <default></default>
         </switch>
      </onComplete>
   </aggregate>
</sequence>

过滤器的存在是为了满足这个代理的API实现。我确实需要2个聚合器，因为我使用克隆和迭代器中介

所以我想知道为什么在我的第二个聚合器之前，消息被重置为一个空soap消息，因此第二个agg无法找到//productDetails。请参阅以下日志条目：

第一次agg后，聚集鞋钉：

TID: [0] [ESB] [2015-02-27 09:46:24,520] DEBUG {org.apache.synapse.mediators.eip.aggregator.AggregateMediator} -  Merging message : <?xml version="1.0" encoding="utf-8"?><soapenv:Envelope xmlns:soapenv="http://schemas.xmlsoap.org/soap/envelope/"><soapenv:Body><productDetails><productID>1124596</productID><productName>REEBOK_SNEAKERS</productName><productSize>7</productSize><productColour>BROWN</productColour><productType>SHOES</productType><sourceID>SHC</sourceID></productDetails></soapenv:Body></soapenv:Envelope> using XPath : //productDetails {org.apache.synapse.mediators.eip.aggregator.AggregateMediator}
TID: [0] [ESB] [2015-02-27 09:46:24,522] DEBUG {org.apache.synapse.mediators.eip.aggregator.AggregateMediator} -  Merged result : <?xml version="1.0" encoding="utf-8"?><soapenv:Envelope xmlns:soapenv="http://schemas.xmlsoap.org/soap/envelope/"><soapenv:Body><productDetails><productID>1452168</productID><productName>PUMPS</productName><productSize>7</productSize><productColour>ORANGE</productColour><productType>SHOE</productType><sourceID>SHC</sourceID></productDetails><productDetails><productID>1124596</productID><productName>REEBOK_SNEAKERS</productName><productSize>7</productSize><productColour>BROWN</productColour><productType>SHOES</productType><sourceID>SHC</sourceID></productDetails></soapenv:Body></soapenv:Envelope> {org.apache.synapse.mediators.eip.aggregator.AggregateMediator}
TID: [0] [ESB] [2015-02-27 09:46:24,523] DEBUG {org.apache.synapse.mediators.eip.aggregator.AggregateMediator} -  Merging message : <?xml version="1.0" encoding="utf-8"?><soapenv:Envelope xmlns:soapenv="http://schemas.xmlsoap.org/soap/envelope/"><soapenv:Body><productDetails><productID>1123456</productID><productName>NIKE_SHIRTS</productName><productSize>7</productSize><productColour>RED</productColour><productType>SHIRT</productType><sourceID>SHC</sourceID></productDetails></soapenv:Body></soapenv:Envelope> using XPath : //productDetails {org.apache.synapse.mediators.eip.aggregator.AggregateMediator}
TID: [0] [ESB] [2015-02-27 09:46:24,525] DEBUG {org.apache.synapse.mediators.eip.aggregator.AggregateMediator} -  Merged result : <?xml version="1.0" encoding="utf-8"?><soapenv:Envelope xmlns:soapenv="http://schemas.xmlsoap.org/soap/envelope/"><soapenv:Body><productDetails><productID>1452168</productID><productName>PUMPS</productName><productSize>7</productSize><productColour>ORANGE</productColour><productType>SHOE</productType><sourceID>SHC</sourceID></productDetails><productDetails><productID>1124596</productID><productName>REEBOK_SNEAKERS</productName><productSize>7</productSize><productColour>BROWN</productColour><productType>SHOES</productType><sourceID>SHC</sourceID></productDetails><productDetails><productID>1123456</productID><productName>NIKE_SHIRTS</productName><productSize>7</productSize><productColour>RED</productColour><productType>SHIRT</productType><sourceID>SHC</sourceID></productDetails></soapenv:Body></soapenv:Envelope> {org.apache.synapse.mediators.eip.aggregator.AggregateMediator}

然后，当我们进入第二次agg时：

TID: [0] [ESB] [2015-02-27 09:46:24,545] DEBUG {org.apache.synapse.mediators.eip.aggregator.AggregateMediator} -  Generating Aggregated message from : <?xml version="1.0" encoding="utf-8"?><soapenv:Envelope xmlns:soapenv="http://schemas.xmlsoap.org/soap/envelope/"><soapenv:Body><productDetails><noItemFound>No item in Ackerman's</noItemFound></productDetails></soapenv:Body></soapenv:Envelope> {org.apache.synapse.mediators.eip.aggregator.AggregateMediator}
TID: [0] [ESB] [2015-02-27 09:46:24,547] DEBUG {org.apache.synapse.mediators.eip.aggregator.AggregateMediator} -  Merging message : <?xml version="1.0" encoding="utf-8"?><soapenv:Envelope xmlns:soapenv="http://schemas.xmlsoap.org/soap/envelope/"><soapenv:Body></soapenv:Body></soapenv:Envelope> using XPath : //productDetails {org.apache.synapse.mediators.eip.aggregator.AggregateMediator}
TID: [0] [ESB] [2015-02-27 09:46:24,550] ERROR {org.apache.synapse.mediators.eip.aggregator.AggregateMediator} -  Error evaluating expression: //productDetails {org.apache.synapse.mediators.eip.aggregator.AggregateMediator}

我想要的是合并

<?xml version="1.0" encoding="utf-8"?><soapenv:Envelope xmlns:soapenv="http://schemas.xmlsoap.org/soap/envelope/"><soapenv:Body><productDetails><productID>1452168</productID><productName>PUMPS</productName><productSize>7</productSize><productColour>ORANGE</productColour><productType>SHOE</productType><sourceID>SHC</sourceID></productDetails><productDetails><productID>1124596</productID><productName>REEBOK_SNEAKERS</productName><productSize>7</productSize><productColour>BROWN</productColour><productType>SHOES</productType><sourceID>SHC</sourceID></productDetails><productDetails><productID>1123456</productID><productName>NIKE_SHIRTS</productName><productSize>7</productSize><productColour>RED</productColour><productType>SHIRT</productType><sourceID>SHC</sourceID></productDetails></soapenv:Body></soapenv:Envelope>

与

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您好，如果将克隆中介器与一个聚合中介器一起使用，则可以聚合来自两个不同服务的响应。查看本教程，了解其工作原理

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任何其他的设计建议都是欢迎的。谢谢你的尝试，伙计，但那不行。我把它分离出来，再加上另一个序列，使它工作起来。只是奇怪和意外的行为，如q中所述。

<soapenv:Envelope xmlns:soapenv="http://schemas.xmlsoap.org/soap/envelope/"><soapenv:Body><productDetails><noItemFound>No item in Ackerman's</noItemFound></productDetails></soapenv:Body></soapenv:Envelope>