WSO2 Amazonsns connector issues publishing json message - json

Question

I am trying to publish a json message using the Amazonsns connector in WSO2 ESB 4.9. I am able to successfully publish a simple string message however when I set the messagestructure to json in order to send different messages to different platforms and attempting to send json as the value of message it will not work. I am using a simple transaction that looks almost exactly like the documentation sample. My Transaction:
content-type: application/json;charset=UTF-8
{
"region":"us-west-2",
"accessKeyId":"MyAccessKey",
"secretAccessKey":"MySecretAccessKey",
"version":"",
"messageStructure":"json",
"subject":"Test",
"message": {"default":"mess","email":"message"},
"targetArn":"arn:aws:sns:us-west-2:977102061874:endpoint/APNS_SANDBOX/mobile_iOS_Sandbox/34ed4324e6-1119-67sd-b7dd-f413c88e4e25",
"topicArn":""
}
My result is an unexpected error sending message out.
Caused by: javax.xml.stream.XMLStreamException: ParseError at [row,col]:[1,73]Message: Illegal character: <d>
My service is also like the example:
<amazonsns.init>
<region>{$ctx:region}</region>
<accessKeyId>{$ctx:accessKeyId}</accessKeyId>
<secretAccessKey>{$ctx:secretAccessKey}</secretAccessKey>
<version>{$ctx:version}</version>
</amazonsns.init>
<amazonsns.publish>
<message>{$ctx:message}</message>
<subject>{$ctx:subject}</subject>
<messageStructure>{$ctx:messageStructure}</messageStructure>
<topicArn>{$ctx:topicArn}</topicArn>
<targetArn>{$ctx:targetArn}</targetArn>
</amazonsns.publish>
I did not expect much success but just started trying different things....I attempted xml encoding the json message and get the same message on '&'. Using wire logs I found the content type of the successful messages going to Amazon were application/x-www-form-urlencoded so I also tried url encoding and get same message on the '%'.
I'm running out of ideas. I double checked the connector documentation to make sure I did not miss anything. It does say you can use a JSON transaction for Publish and gives a sample transaction however it does not discuss anything special/different that you would need to set up in order to make this work. Is there something I am missing?
UPDATE: Can see it is using the Builder for application/x-www-form-urlencoded which is stumbling on the json. Have tried setting messageType and ContentType properties to application/json. JSON Builder is enabled. It just seems the connector wants to send it out as application/x-www-form-urlencoded, is there something I am not setting properly to tell the connector this is JSON?
UPDATE: The publish template that comes with the connector is setting the messagetype to applicaiton/x-www-form-urlencoded which is overriding any of the settings I am making in my proxy service. Going to look at changing the template in the connector to use a different messagetype and/or allow me to set it in the proxy dynamically then will be trying again.
Joe

Answer 1

We have created a public JIRA for this issue. Please follow that.

Answer 2

You need to enable message builders for the content types you are sending. make sure following is done.
Enable relevent Message builder for each content-type.
< messageBuilder contentType="application/json"
class="org.apache.synapse.commons.json.JsonStreamBuilder"/>
Make sure Content-Type header property is parsing with the message.
Make sure your Json is wellformed.