WSO2 DataMapper Error converting XML to SOAP - wso2

Question

I've to convert my backend soap response to json. For this i use a datamapper XML to JSON. The datamapper failed at runtime with this error:
[2019-11-01 14:58:29,805] [micro-integrator] ERROR - DataMapperMediator DataMapper mediator : mapping failed
Error while parsing XML input stream. Current context not Object but root
at org.wso2.carbon.mediator.datamapper.engine.input.readers.XMLInputReader.read(XMLInputReader.java:124)
at org.wso2.carbon.mediator.datamapper.engine.input.InputBuilder.buildInputModel(InputBuilder.java:59)
at org.wso2.carbon.mediator.datamapper.engine.core.mapper.MappingHandler.doMap(MappingHandler.java:90)
at org.wso2.carbon.mediator.datamapper.DataMapperMediator.transform(DataMapperMediator.java:390)
at org.wso2.carbon.mediator.datamapper.DataMapperMediator.mediate(DataMapperMediator.java:301)
at org.apache.synapse.mediators.AbstractListMediator.mediate(AbstractListMediator.java:109)
at org.apache.synapse.mediators.AbstractListMediator.mediate(AbstractListMediator.java:71)
at org.apache.synapse.mediators.base.SequenceMediator.mediate(SequenceMediator.java:158)
at org.apache.synapse.rest.Resource.process(Resource.java:363)
at org.apache.synapse.rest.API.process(API.java:370)
at org.apache.synapse.rest.RESTRequestHandler.apiProcess(RESTRequestHandler.java:135)
at org.apache.synapse.rest.RESTRequestHandler.dispatchToAPI(RESTRequestHandler.java:113)
at org.apache.synapse.rest.RESTRequestHandler.process(RESTRequestHandler.java:58)
at org.apache.synapse.core.axis2.Axis2SynapseEnvironment.injectMessage(Axis2SynapseEnvironment.java:325)
at org.apache.synapse.core.axis2.SynapseCallbackReceiver.handleMessage(SynapseCallbackReceiver.java:578)
at org.apache.synapse.core.axis2.SynapseCallbackReceiver.receive(SynapseCallbackReceiver.java:195)
at org.apache.axis2.engine.AxisEngine.receive(AxisEngine.java:180)
at org.apache.synapse.transport.passthru.ClientWorker.run(ClientWorker.java:265)
at org.apache.axis2.transport.base.threads.NativeWorkerPool$1.run(NativeWorkerPool.java:172)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
at java.lang.Thread.run(Thread.java:748)
[2019-11-01 14:58:29,807] [micro-integrator] ERROR - AgendaRestApi DataMapper mediator : mapping failed
Error while parsing XML input stream. Current context not Object but root
at org.wso2.carbon.mediator.datamapper.engine.input.readers.XMLInputReader.read(XMLInputReader.java:124)
at org.wso2.carbon.mediator.datamapper.engine.input.InputBuilder.buildInputModel(InputBuilder.java:59)
at org.wso2.carbon.mediator.datamapper.engine.core.mapper.MappingHandler.doMap(MappingHandler.java:90)
at org.wso2.carbon.mediator.datamapper.DataMapperMediator.transform(DataMapperMediator.java:390)
at org.wso2.carbon.mediator.datamapper.DataMapperMediator.mediate(DataMapperMediator.java:301)
at org.apache.synapse.mediators.AbstractListMediator.mediate(AbstractListMediator.java:109)
at org.apache.synapse.mediators.AbstractListMediator.mediate(AbstractListMediator.java:71)
at org.apache.synapse.mediators.base.SequenceMediator.mediate(SequenceMediator.java:158)
at org.apache.synapse.rest.Resource.process(Resource.java:363)
at org.apache.synapse.rest.API.process(API.java:370)
at org.apache.synapse.rest.RESTRequestHandler.apiProcess(RESTRequestHandler.java:135)
at org.apache.synapse.rest.RESTRequestHandler.dispatchToAPI(RESTRequestHandler.java:113)
at org.apache.synapse.rest.RESTRequestHandler.process(RESTRequestHandler.java:58)
at org.apache.synapse.core.axis2.Axis2SynapseEnvironment.injectMessage(Axis2SynapseEnvironment.java:325)
at org.apache.synapse.core.axis2.SynapseCallbackReceiver.handleMessage(SynapseCallbackReceiver.java:578)
at org.apache.synapse.core.axis2.SynapseCallbackReceiver.receive(SynapseCallbackReceiver.java:195)
at org.apache.axis2.engine.AxisEngine.receive(AxisEngine.java:180)
at org.apache.synapse.transport.passthru.ClientWorker.run(ClientWorker.java:265)
at org.apache.axis2.transport.base.threads.NativeWorkerPool$1.run(NativeWorkerPool.java:172)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
at java.lang.Thread.run(Thread.java:748)
The input and output sample files used to configure the datamapper are:
INPUT
<s:Envelope xmlns:s="http://schemas.xmlsoap.org/soap/envelope/">
<s:Body>
<GetSpecialtiesResponse xmlns="http://agenda/">
<GetSpecialtiesResult xmlns:a="http://schemas.datacontract.org/2004/07/WsAgenda.DataContracts" xmlns:i="http://www.w3.org/2001/XMLSchema-instance">
<a:Specialty>
<a:code>cardiology</a:code>
<a:name>Cardiologie</a:name>
</a:Specialty>
<a:Specialty>
<a:code>neurology</a:code>
<a:name>Neurologie</a:name>
</a:Specialty>
</GetSpecialtiesResult>
</GetSpecialtiesResponse>
</s:Body>
</s:Envelope>
OUTPUT:
{"Specialties": [
{
"id": "cardiology",
"description": "Cardiologie"
},
{
"id": "cardiology",
"description": "Cardiologie"
}
]}
In the datamapper designer all seems to working fine.
Here is the sequence code:
<?xml version="1.0" encoding="UTF-8"?>
<api context="/agenda" name="AgendaRestApi" xmlns="http://ws.apache.org/ns/synapse">
<resource methods="GET" url-mapping="/specialties">
<inSequence>
<log/>
<payloadFactory description="" media-type="xml">
<format>
<soapenv:Envelope xmlns:agen="http://agenda/" xmlns:soapenv="http://schemas.xmlsoap.org/soap/envelope/">
<soapenv:Header/>
<soapenv:Body>
<agen:GetSpecialties/>
</soapenv:Body>
</soapenv:Envelope>
</format>
<args/>
</payloadFactory>
<header name="soapAction" scope="transport" value="http://agenda/agenda/GetSpecialties"/>
<send>
<endpoint key="AgendaEP"/>
</send>
</inSequence>
<outSequence>
<datamapper config="gov:datamapper/GetSpecialtiesMapping.dmc" inputSchema="gov:datamapper/GetSpecialtiesMapping_inputSchema.json" inputType="XML" outputSchema="gov:datamapper/GetSpecialtiesMapping_outputSchema.json" outputType="JSON" xsltStyleSheet="gov:datamapper/GetSpecialtiesMapping_xsltStyleSheet.xml"/>
<property name="messageType" scope="axis2" type="STRING" value="application/json"/>
<respond/>
</outSequence>
<faultSequence>
<log level="full"/>
</faultSequence>
</resource>
</api>
All possible solutions are welcome :)

Answer 1

I had the same problem and solved adding this property before the datamapper mediator.
<property name="messageType" scope="axis2" type="STRING" value="text/xml"/>
<datamapper config="gov:datamapper/GetSpecialtiesMapping.dmc" inputSchema="gov:datamapper/GetSpecialtiesMapping_inputSchema.json" inputType="XML" outputSchema="gov:datamapper/GetSpecialtiesMapping_outputSchema.json" outputType="JSON" xsltStyleSheet="gov:datamapper/GetSpecialtiesMapping_xsltStyleSheet.xml"/>
Hope this helps,
JP