WSO2 PayloadFactory is sending json wrapped with jsonObject - api

Question

I am using WSO2 API Manager 1.7.0 and am doing a simple payloadfactory attempting to convert a call from a GET to a POST passing in a json payload.
However when I look at the log files it appears that WSO2 is sending the json wrapped with {"jsonObject": [myjson] }
I am new to WSO2 and am not sure what cofiguration setting I need to use to stop this. I assume it is a config setting since in no examples or documentation that I have found does anyone else mention this.
My api looks like this:
"POST http://localhost:81/Service/ProcessRequest HTTP/1.1[\r][\n]"
"Authorization: Basic asdfadfadfadfadfadfadfa=[\r][\n]"
"Accept-Encoding: gzip,deflate[\r][\n]"
"Content-Type: application/json[\r][\n]"
"activityID: 2342342342342342342342342[\r][\n]"
"Transfer-Encoding: chunked[\r][\n]"
"Host: localhost:81[\r][\n]"
"Connection: Keep-Alive[\r][\n]"
"User-Agent: Synapse-PT-HttpComponents-NIO[\r][\n]"
"[\r][\n]"
I/O session http-outgoing-2-3 11.11.11.11:12345<->192.168.1.1:8080[ACTIVE][rw:w]: 0 bytes written
http-outgoing-2: Produce output
I/O session http-outgoing-2-3 11.11.11.11:12345<->192.168.1.1:8080[ACTIVE][rw:w]: 230 bytes written
"db[\r][\n]"
"{"jsonObject":{"UserType":"User"}}[\r][\n]"
"0[\r][\n]"
"[\r][\n]"
The log file part that seems to apply to the service call looks like this:
<api name="admin--JJJJJ" context="/jjjjj" version="v1.0" version-type="url">
<resource methods="GET" url-mapping="/documents">
<inSequence>
<payloadFactory media-type="json">
<format>{"UserType":"User"}</format>
<args/>
</payloadFactory>
<property name="Authorization" expression="fn:concat('Basic ', base64Encode('user:password'))" scope="transport"/>
<property name="HTTP_METHOD" value="POST" scope="axis2" type="STRING"/>
<property name="messageType" value="application/json" scope="axis2"/>
<property name="REST_URL_POSTFIX" scope="axis2" action="remove"/>
<log>
<property name="JSON-Payload" expression="json-eval($.)"/>
</log>
<send>
<endpoint name="admin--JJJJJ_APIproductionEndpoint_0">
<http trace="enable" method="post" uri-template="http://localhost:81/Service/ProcessRequest"></http>
</endpoint>
</send>
</inSequence>
<outSequence>
<send/>
</outSequence>
</resource>
<handlers>
...
</handlers>
</api>
I'm not sure where the db and 0 come from in the transmission but the error I get back from my service appears to be caused by the wrapping jsonObject.
Does anyone have any hints or ideas on how I can either prevent this wrapping or modify the payload just prior to sending it to remove it. Or I guess a better or even different way of transforming a GET request to a POST with a json payload.
Thank you for any hints on what I'm doing wrong.

Answer 1

change the messageformater in axi2.xml (/repository/conf/axis2/axis2.xml)file as
<messageFormatter contentType="application/json" class="org.apache.synapse.commons.json.JsonStreamFormatter"/>
and comment the default message formatter for json
<!--messageFormatter contentType="application/json" class="org.apache.axis2.json.JSONMessageFormatter"/-->
learn more on json support here[1]
https://docs.wso2.com/display/ESB480/JSON+Support

Answer 2

You can add an enrich mediator to api before send mediator to remove jsonObject wrapper from body like below.
<enrich>
<source clone="true" xpath="$body//jsonObject//UserType"/>
<target type="body"/>
</enrich>
You can add a log mediator after enrich mediator and check the changed body.
Hope this will help you.