WSO2 ESB:WSO2 REST API调用中的XML响应未解析

Question

我在WSO2 ESB(4.8.1)代理服务中处理来自REST API的纯XML响应时遇到了麻烦。显然，我的outSequence将API调用结果有效负载导出为SOAP消息，而它不是SOAP消息（纯XML)，在进一步处理它时导致错误。我使用HTTPendpoint，但使用Addressendpoint时也会出现同样的错误。我必须使用GET作为请求方法，因为API不允许POX。（这个问题似乎与WSO2 ESB中已经提到的问题类似：将响应从RDF REST服务记录并转换回SOAP，但ESB 4.8.1中似乎没有解决这个问题，我无法使用这里提到的解决方法）

这里是我的终结点：

<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>

下面是代理：

<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>

当我尝试记录响应时,会出现以下错误：

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

这里有人想办法解决吗？

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并且在响应头中标记，那么WSO2就可以很好地将其传递给客户机。一旦响应标记不同--在我的例子中是Application/Atom+XML，默认的MessageBuilder就没有应用，因此WSO2期望内容是SOAP。我向\repository\conf\axis2\axis2.xml添加了一个构建器配置：

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

现在很好。

请参阅https://docs.wso2.com/display/esb480/working+with+message+builders+and+formatters和https://docs.wso2.com/display/esb402/message+relay+building+blocks