WSO2 ESB：未解析 WSO2 REST API 调用中的 XML 响应

Question

我在 WSO2 ESB (4.8.1) 代理服务中处理来自我的 REST API 的纯 XML 响应时遇到问题。我的 outSequence 显然期望 API 调用结果有效负载是一个 SOAP 消息，它不是（纯 XML）在进一步处理它时导致错误。我使用 HTTP 端点，但使用地址端点时会出现同样的错误。我必须使用 GET 作为请求方法，因为 API 不允许 POX。 （这个问题似乎类似于WSO2 ESB: log and convert response from the RDF REST service back to SOAP 中已经提到的问题，但它似乎在 ESB 4.8.1 中没有得到修复，我无法使用那里提到的解决方法）

这是我的终点：

<endpoint xmlns="http://ws.apache.org/ns/synapse" name="Alfresco_login">
   <http uri-template="http://localhost:8080/alfresco/service/api/login?u={query.param.name}&pw={query.param.password}" method="get"></http>
</endpoint>

这是代理：

<proxy xmlns="http://ws.apache.org/ns/synapse"
       name="Alfresco_proxy"
       transports="https,http">
   <target endpoint="Alfresco_login">
      <inSequence>
         <property name="query.param.name" value="XXX"/>
         <property name="query.param.password" value="XXX"/>
      </inSequence>
      <outSequence>
         <log/>
         <send/>
      </outSequence>`enter code here`
   </target>
   <description/>
</proxy>

这是我从 API 得到的响应：

<?xml version="1.0" encoding="UTF-8"?>
<ticket>TICKET_605cbf0977db895db9bbc6e5eb6d4dba75454cc4</ticket>

这是我尝试记录响应时遇到的错误：

ERROR_EXCEPTION : org.apache.synapse.SynapseException: Error while building message
ERROR_DETAIL : org.apache.synapse.SynapseException: Error while building message at org.apache.synapse.mediators.AbstractMediator.handleException(AbstractMediator.java:313) at org.apache.synapse.mediators.AbstractListMediator.mediate(AbstractListMediator.java:70) at org.apache.synapse.mediators.AbstractListMediator.mediate(AbstractListMediator.java:47) at org.apache.synapse.mediators.base.SequenceMediator.mediate(SequenceMediator.java:131) at org.apache.synapse.core.axis2.Axis2SynapseEnvironment.injectMessage(Axis2SynapseEnvironment.java:268) at org.apache.synapse.core.axis2.SynapseCallbackReceiver.handleMessage(SynapseCallbackReceiver.java:488) at org.apache.synapse.core.axis2.SynapseCallbackReceiver.receive(SynapseCallbackReceiver.java:170) at org.apache.axis2.engine.AxisEngine.receive(AxisEngine.java:180) at org.apache.synapse.transport.passthru.ClientWorker.run(ClientWorker.java:225) at org.apache.axis2.transport.base.threads.NativeWorkerPool$1.run(NativeWorkerPool.java:172) at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145) at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615) at java.lang.Thread.run(Thread.java:745) Caused by: org.apache.axis2.AxisFault: Error while building Passthrough stream at org.apache.synapse.transport.passthru.util.RelayUtils.handleException(RelayUtils.java:236) at org.apache.synapse.transport.passthru.util.RelayUtils.builldMessage(RelayUtils.java:111) at org.apache.synapse.transport.passthru.util.RelayUtils.buildMessage(RelayUtils.java:82) at org.apache.synapse.mediators.AbstractListMediator.mediate(AbstractListMediator.java:68) ... 11 more Caused by: org.apache.axiom.soap.SOAPProcessingException: First Element must contain the local name, Envelope , but found ticket at org.apache.axiom.soap.impl.builder.StAXSOAPModelBuilder.constructNode(StAXSOAPModelBuilder.java:305) at org.apache.axiom.soap.impl.builder.StAXSOAPModelBuilder.createOMElement(StAXSOAPModelBuilder.java:252) at org.apache.axiom.soap.impl.builder.StAXSOAPModelBuilder.createNextOMElement(StAXSOAPModelBuilder.java:234) at org.apache.axiom.om.impl.builder.StAXOMBuilder.next(StAXOMBuilder.java:249) at org.apache.axiom.soap.impl.builder.StAXSOAPModelBuilder.getSOAPEnvelope(StAXSOAPModelBuilder.java:204) at org.apache.axiom.soap.impl.builder.StAXSOAPModelBuilder.<init>(StAXSOAPModelBuilder.java:154) at org.apache.axiom.om.impl.AbstractOMMetaFactory.createStAXSOAPModelBuilder(AbstractOMMetaFactory.java:73) at org.apache.axiom.om.impl.AbstractOMMetaFactory.createSOAPModelBuilder(AbstractOMMetaFactory.java:79) at org.apache.axiom.om.OMXMLBuilderFactory.createSOAPModelBuilder(OMXMLBuilderFactory.java:196) at org.apache.axis2.builder.SOAPBuilder.processDocument(SOAPBuilder.java:55) at org.apache.synapse.transport.passthru.util.DeferredMessageBuilder.getDocument(DeferredMessageBuilder.java:118) at org.apache.synapse.transport.passthru.util.RelayUtils.builldMessage(RelayUtils.java:107) ... 13 more

这里有人找到解决方法吗？

Answer 1

最后，主要问题出现在正确的 MessageBuilder 配置中。只要服务响应是一个简单的 XML 并且因此在响应标头中进行了标记，WSO2 就可以很好地将其传递给客户端。一旦响应被标记为不同 - 在我的情况下它是 application/atom+xml，默认的 MessageBuilder 没有应用，因此 WSO2 期望内容是 SOAP。我在 \repository\conf\axis2\axis2.xml 中添加了一个构建器配置：

<messageBuilder class="org.apache.axis2.builder.ApplicationXMLBuilder" contentType="application/atom+xml"/>

现在工作正常。

见https://docs.wso2.com/display/ESB480/Working+with+Message+Builders+and+Formatters和https://docs.wso2.com/display/ESB402/Message+Relay+Building+Blocks