Can't parse JSON response in the OutSequence wso2 esb? - wso2

Question

At the start of the Outsequence I am using this:
<property name="messageType" value="application/JSON" scope="axis2"/>
but still I get the error message Content not allowed in prolog.
If I directly send the response to the client without using any mediators I don't get any error.
Below is the full stack trace:
[2015-07-07 12:11:35,747] ERROR - RelayUtils Error while building Passthrough stream
org.apache.axiom.om.OMException: javax.xml.stream.XMLStreamException: ParseError at [row,col]:[1,1]
Message: Content is not allowed in prolog.
at org.apache.axiom.om.impl.builder.StAXOMBuilder.next(StAXOMBuilder.java:296)
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:138)
at org.apache.synapse.transport.passthru.util.RelayUtils.builldMessage(RelayUtils.java:107)
at org.apache.synapse.transport.passthru.util.RelayUtils.buildMessage(RelayUtils.java:82)
at org.apache.synapse.mediators.AbstractListMediator.mediate(AbstractListMediator.java:68)
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)

Answer 1

I am able to parse JSON response.
WSO2 ESB version used- 4.8.1
Below is the proxy code.
<?xml version="1.0" encoding="UTF-8"?><proxy xmlns="http://ws.apache.org/ns/synapse" name="JsonProxy" transports="https,http" statistics="disable" trace="disable" startOnLoad="true">
<target>
<inSequence>
<log level="full">
<property name="################ REQUEST ###################" expression="$body"/>
</log>
<send>
<endpoint>
<address uri="http://ip.jsontest.com/"/>
</endpoint>
</send>
</inSequence>
<outSequence>
<property name="messageType" value="application/json" scope="axis2" type="STRING"/>
<log level="full">
<property name="################ RESPONSE###################" expression="$body"/>
</log>
<log>
<property name="::::::::::::::::::::::::::::: JSON :::::::::::::::::::::::::::" expression="json-eval($.)"/>
</log>
<send/>
</outSequence>
</target>
<description/>
</proxy>
Please cross check that below lines are only uncommented in axis2.xml
<messageFormatter contentType="application/json"
class="org.apache.synapse.commons.json.JsonStreamFormatter"/>
<messageFormatter contentType="application/json/badgerfish"
class="org.apache.axis2.json.JSONBadgerfishMessageFormatter"/>
<messageBuilder contentType="application/json"
class="org.apache.synapse.commons.json.JsonStreamBuilder"/>
<messageBuilder contentType="application/json/badgerfish"
class="org.apache.axis2.json.JSONBadgerfishOMBuilder"/>