Question

我在wso2中相对较新，并且遇到一些小问题。我已经在这里问过，如何进行这种转换，并且能够在另一个时刻完成。但是现在我试着对堆栈溢出传递的代码做同样的事情：

<?xml version="1.0" encoding="UTF-8"?>
<api context="/Test" name="JsonToXmlApi" xmlns="http://ws.apache.org/ns/synapse">
    <resource methods="POST" uri-template="/xml/">
        <inSequence>
            <property name="messageType" scope="axis2" type="STRING" value="text/xml"/>
            <header action="remove" name="To" scope="default"/>
            <property name="RESPONSE" scope="default" type="STRING" value="true"/>
            <send/>
        </inSequence>
        <outSequence/>
        <faultSequence/>
    </resource>
</api>

通过发送平等请求，以前所教的内容：

但现在我收到了这个错误：

ERROR - PassThroughHttpSender Failed to submit the response
org.apache.axis2.AxisFault: Can not output XML declaration, after other output has already been done.
        at org.apache.axis2.AxisFault.makeFault(AxisFault.java:430)
        at org.apache.axis2.transport.http.SOAPMessageFormatter.writeTo(SOAPMessageFormatter.java:78)
        at org.apache.synapse.transport.passthru.PassThroughHttpSender.submitResponse(PassThroughHttpSender.java:555)
        at org.apache.synapse.transport.passthru.PassThroughHttpSender.invoke(PassThroughHttpSender.java:264)
        at org.apache.axis2.engine.AxisEngine.send(AxisEngine.java:442)
        at org.apache.synapse.core.axis2.Axis2Sender.sendBack(Axis2Sender.java:222)
        at org.apache.synapse.core.axis2.Axis2SynapseEnvironment.send(Axis2SynapseEnvironment.java:531)
        at org.apache.synapse.mediators.builtin.SendMediator.mediate(SendMediator.java:118)
        at org.apache.synapse.mediators.AbstractListMediator.mediate(AbstractListMediator.java:97)
        at org.apache.synapse.mediators.AbstractListMediator.mediate(AbstractListMediator.java:59)
        at org.apache.synapse.mediators.base.SequenceMediator.mediate(SequenceMediator.java:158)
        at org.apache.synapse.rest.Resource.process(Resource.java:343)
        at org.apache.synapse.rest.API.process(API.java:399)
        at org.apache.synapse.rest.RESTRequestHandler.apiProcess(RESTRequestHandler.java:123)
        at org.apache.synapse.rest.RESTRequestHandler.dispatchToAPI(RESTRequestHandler.java:101)
        at org.apache.synapse.rest.RESTRequestHandler.process(RESTRequestHandler.java:69)
        at org.apache.synapse.core.axis2.Axis2SynapseEnvironment.injectMessage(Axis2SynapseEnvironment.java:304)
        at org.apache.synapse.core.axis2.SynapseMessageReceiver.receive(SynapseMessageReceiver.java:75)
        at org.apache.axis2.engine.AxisEngine.receive(AxisEngine.java:180)
        at org.apache.synapse.transport.passthru.ServerWorker.processNonEntityEnclosingRESTHandler(ServerWorker.java:325)
        at org.apache.synapse.transport.passthru.ServerWorker.processEntityEnclosingRequest(ServerWorker.java:371)
        at org.apache.synapse.transport.passthru.ServerWorker.run(ServerWorker.java:151)
        at org.apache.axis2.transport.base.threads.NativeWorkerPool$1.run(NativeWorkerPool.java:172)
        at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
        at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
        at java.lang.Thread.run(Thread.java:745)
Caused by: javax.xml.stream.XMLStreamException: Can not output XML declaration, after other output has already been done.
        at com.ctc.wstx.sw.BaseStreamWriter.throwOutputError(BaseStreamWriter.java:1522)
        at com.ctc.wstx.sw.BaseStreamWriter.reportNwfStructure(BaseStreamWriter.java:1551)
        at com.ctc.wstx.sw.BaseStreamWriter.doWriteStartDocument(BaseStreamWriter.java:650)
        at com.ctc.wstx.sw.BaseStreamWriter.writeStartDocument(BaseStreamWriter.java:638)
        at com.ctc.wstx.sw.BaseStreamWriter.writeStartDocument(BaseStreamWriter.java:626)
        at org.apache.axiom.om.impl.MTOMXMLStreamWriter.writeStartDocument(MTOMXMLStreamWriter.java:277)
        at org.apache.synapse.commons.json.JsonDataSource.serialize(JsonDataSource.java:88)
        at org.apache.axiom.om.impl.llom.OMSourcedElementImpl.internalSerialize(OMSourcedElementImpl.java:691)
        at org.apache.axiom.om.impl.util.OMSerializerUtil.serializeChildren(OMSerializerUtil.java:562)
        at org.apache.axiom.om.impl.llom.OMElementImpl.internalSerialize(OMElementImpl.java:875)
        at org.apache.axiom.soap.impl.llom.SOAPEnvelopeImpl.serializeInternally(SOAPEnvelopeImpl.java:283)
        at org.apache.axiom.soap.impl.llom.SOAPEnvelopeImpl.internalSerialize(SOAPEnvelopeImpl.java:245)
        at org.apache.axiom.om.impl.llom.OMSerializableImpl.serializeAndConsume(OMSerializableImpl.java:193)
        at org.apache.axis2.transport.http.SOAPMessageFormatter.writeTo(SOAPMessageFormatter.java:74)
        ... 24 more
[2017-07-25 15:35:50,646] ERROR - Axis2Sender Accept:*/*,Accept-Encoding:gzip, deflate, br,Accept-Language:pt-BR,pt;q=0.8,en-US;q=0.6,en;q=0.4,Cache-Control:no-cache,Content-Type:application/soap+xml,Host:localhost:8280,Origin:chrome-extension://fhbjgbiflinjbdggehcddcbncdddomop,Postman-Token:89253418-6c05-c959-5e21-2ce7555e0cb6,<?xml version='1.0' encoding='utf-8'?><soapenv:Envelope xmlns:soapenv="http://schemas.xmlsoap.org/soap/envelope/"><soapenv:Body><jsonObject><location_response><name>cafe</name><tags>dsdsd</tags></location_response></jsonObject></soapenv:Body></soapenv:Envelope> Unexpected error sending message back
org.apache.axis2.AxisFault: Failed to submit the response
        at org.apache.synapse.transport.passthru.PassThroughHttpSender.handleException(PassThroughHttpSender.java:613)
        at org.apache.synapse.transport.passthru.PassThroughHttpSender.invoke(PassThroughHttpSender.java:266)
        at org.apache.axis2.engine.AxisEngine.send(AxisEngine.java:442)
        at org.apache.synapse.core.axis2.Axis2Sender.sendBack(Axis2Sender.java:222)
        at org.apache.synapse.core.axis2.Axis2SynapseEnvironment.send(Axis2SynapseEnvironment.java:531)
        at org.apache.synapse.mediators.builtin.SendMediator.mediate(SendMediator.java:118)
        at org.apache.synapse.mediators.AbstractListMediator.mediate(AbstractListMediator.java:97)
        at org.apache.synapse.mediators.AbstractListMediator.mediate(AbstractListMediator.java:59)
        at org.apache.synapse.mediators.base.SequenceMediator.mediate(SequenceMediator.java:158)
        at org.apache.synapse.rest.Resource.process(Resource.java:343)
        at org.apache.synapse.rest.API.process(API.java:399)
        at org.apache.synapse.rest.RESTRequestHandler.apiProcess(RESTRequestHandler.java:123)
        at org.apache.synapse.rest.RESTRequestHandler.dispatchToAPI(RESTRequestHandler.java:101)
        at org.apache.synapse.rest.RESTRequestHandler.process(RESTRequestHandler.java:69)
        at org.apache.synapse.core.axis2.Axis2SynapseEnvironment.injectMessage(Axis2SynapseEnvironment.java:304)
        at org.apache.synapse.core.axis2.SynapseMessageReceiver.receive(SynapseMessageReceiver.java:75)
        at org.apache.axis2.engine.AxisEngine.receive(AxisEngine.java:180)
        at org.apache.synapse.transport.passthru.ServerWorker.processNonEntityEnclosingRESTHandler(ServerWorker.java:325)
        at org.apache.synapse.transport.passthru.ServerWorker.processEntityEnclosingRequest(ServerWorker.java:371)
        at org.apache.synapse.transport.passthru.ServerWorker.run(ServerWorker.java:151)
        at org.apache.axis2.transport.base.threads.NativeWorkerPool$1.run(NativeWorkerPool.java:172)
        at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
        at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
        at java.lang.Thread.run(Thread.java:745)
Caused by: org.apache.axis2.AxisFault: Can not output XML declaration, after other output has already been done.
        at org.apache.axis2.AxisFault.makeFault(AxisFault.java:430)
        at org.apache.axis2.transport.http.SOAPMessageFormatter.writeTo(SOAPMessageFormatter.java:78)
        at org.apache.synapse.transport.passthru.PassThroughHttpSender.submitResponse(PassThroughHttpSender.java:555)
        at org.apache.synapse.transport.passthru.PassThroughHttpSender.invoke(PassThroughHttpSender.java:264)
        ... 22 more
Caused by: javax.xml.stream.XMLStreamException: Can not output XML declaration, after other output has already been done.
        at com.ctc.wstx.sw.BaseStreamWriter.throwOutputError(BaseStreamWriter.java:1522)
        at com.ctc.wstx.sw.BaseStreamWriter.reportNwfStructure(BaseStreamWriter.java:1551)
        at com.ctc.wstx.sw.BaseStreamWriter.doWriteStartDocument(BaseStreamWriter.java:650)
        at com.ctc.wstx.sw.BaseStreamWriter.writeStartDocument(BaseStreamWriter.java:638)
        at com.ctc.wstx.sw.BaseStreamWriter.writeStartDocument(BaseStreamWriter.java:626)
        at org.apache.axiom.om.impl.MTOMXMLStreamWriter.writeStartDocument(MTOMXMLStreamWriter.java:277)
        at org.apache.synapse.commons.json.JsonDataSource.serialize(JsonDataSource.java:88)
        at org.apache.axiom.om.impl.llom.OMSourcedElementImpl.internalSerialize(OMSourcedElementImpl.java:691)
        at org.apache.axiom.om.impl.util.OMSerializerUtil.serializeChildren(OMSerializerUtil.java:562)
        at org.apache.axiom.om.impl.llom.OMElementImpl.internalSerialize(OMElementImpl.java:875)
        at org.apache.axiom.soap.impl.llom.SOAPEnvelopeImpl.serializeInternally(SOAPEnvelopeImpl.java:283)
        at org.apache.axiom.soap.impl.llom.SOAPEnvelopeImpl.internalSerialize(SOAPEnvelopeImpl.java:245)
        at org.apache.axiom.om.impl.llom.OMSerializableImpl.serializeAndConsume(OMSerializableImpl.java:193)
        at org.apache.axis2.transport.http.SOAPMessageFormatter.writeTo(SOAPMessageFormatter.java:74)
        ... 24 more

我已经在互联网和stackoverflow中搜索了，但是在我的情况下没有解决这个问题的解决方案。如果有人能帮助我，我会非常感激。

谢谢大家。

Answer 1

您分享的API工作正常。我曾尝试过邮差和高级休息客户端。

有关json支持的更多信息，请参阅https://docs.wso2.com/display/EI610/JSON+Support。

Answer 2

我可以毫无错误地获得api的响应。尝试在api中使用“application / xml”而不是“text / xml”。

<property name="messageType" value="application/xml" scope="axis2" type="STRING"/>

我无法在XML中转换json

2 个答案: