No suitable HttpMessageConverter found error while executing rest service that takes multipart parameters - spring-integration

Question

I am using Spring Integration in my project. I am trying to execute a rest service which takes multipart/formdata input parameters. I am using int-http:outbound-gateway to execute rest service. The following is the code:
<int:channel id="PQcreateAttachment-Rest-Channel" />
<int:chain input-channel="PQcreateAttachment-Rest-Channel" output-channel="PQcreateAttachment-StoredProcedure-Router" >
<int:header-filter header-names="accept-encoding"/>
<int:service-activator ref="httpOutboundGatewayHandler" method="buildMultipartHttpOutboundGatewayRequest" />
<int-http:outbound-gateway url-expression="headers.restResourceUrl"
http-method-expression="headers.httpMethod"
extract-request-payload="true"
>
</int-http:outbound-gateway>
<int:service-activator ref="msgHandler" method="buildMessageFromExtSysResponse" />
</int:chain>
But I am getting the following error when I execute the above code.
Caused by: org.springframework.web.client.RestClientException: Could not write request: no suitable HttpMessageConverter found for request type [org.springframework.integration.message.GenericMessage] and content type [application/x-java-serialized-object]
at org.springframework.web.client.RestTemplate$HttpEntityRequestCallback.doWithRequest(RestTemplate.java:665)
at org.springframework.web.client.RestTemplate.doExecute(RestTemplate.java:481)
at org.springframework.web.client.RestTemplate.execute(RestTemplate.java:460)
at org.springframework.web.client.RestTemplate.exchange(RestTemplate.java:409)
at org.springframework.integration.http.outbound.HttpRequestExecutingMessageHandler.handleRequestMessage(HttpRequestExecutingMessageHandler.java:372)
... 121 more
Here is the java code that prepares my multipart request:
public Message<?> buildMultipartHttpOutboundGatewayRequest(Message<?> inMessage) throws Exception{
logger.debug(" ************** buildMultipartHttpOutboundGatewayRequest Start *************************");
String inMsgPayload = (String)inMessage.getPayload();
SOAXml soaXml = parseSOAXml(inMsgPayload);
String restURL = null;
String contentType = null;
String acceptHdr = null;
String userId = null;
String password = null;
String businessAreaName = null;
String typeName = null;
String attachmentLocation = null;
String httpMethod = null;
Message<?> outMessage = null;
MessageHeaders inMsgHdrs = null;
MessageBuilder<?> msgBuild = null;
String authorization = null;
//TODO: File location needs to be changed to standard one
String fileLocation = "C:\\source.xml";
//if we reach here means, it is AWD system
restURL = getAwdSOAService(soaXml);
Document document = XmlParserUtil.convertString2Document(inMsgPayload);
userId = XmlParserUtil.getNodeValue(document,"//userId");
password = XmlParserUtil.getNodeValue(document,"//PQcreateAttachment/password");
businessAreaName = XmlParserUtil.getNodeValue(document,"//businessAreaName");
typeName = XmlParserUtil.getNodeValue(document,"//typeName");
httpMethod = XmlParserUtil.getNodeValue(document,"//METHOD");
attachmentLocation = XmlParserUtil.getNodeValue(document,"//attachmentLocation");
//Construct source xml
//Creating document
Document sourceDocument = DocumentHelper.createDocument();
Element sourceInstance = sourceDocument.addElement("createSourceInstance");
sourceInstance.addAttribute("xmlns", "http://www.dsttechnologies.com/awd/rest/v1");
Element orderItem=sourceInstance.addElement("businessAreaName");
orderItem.setText("SAMPLEBA");
Element orderItemDesc=sourceInstance.addElement("typeName");
orderItemDesc.setText("SAMPLEST");
// create source xml file
XmlParserUtil.createXMLFileUsingDOM4J(sourceDocument, fileLocation);
authorization = getBasicAuthorization(userId,password);
Resource source = new ClassPathResource(fileLocation);
Resource attachment = new ClassPathResource(attachmentLocation);
Map<String, Object> multipartMap = new HashMap<String, Object>();
multipartMap.put("source", source);
multipartMap.put("attachment", attachment);
logger.info("Created multipart request: " + multipartMap);
inMessage = buildMessageForMultipart(multipartMap);
// contentType = csProps.getHttpAwdContentTypeValue();
acceptHdr = csProps.getHttpAwdAcceptTypeValue() ;
// authorization = getBasicAuthorization(soaXml.getUserid(),decriptPassword(soaXml.getPassword()));
inMsgHdrs = inMessage.getHeaders();
msgBuild = MessageBuilder.withPayload(inMessage).copyHeaders(inMsgHdrs);
msgBuild.removeHeader("Content-Encoding");
msgBuild.removeHeader("accept-encoding");
msgBuild.setHeader(csProps.getHttpUrlHdr(), restURL);
msgBuild.setHeader(csProps.getHttpMethodHdr(), httpMethod);
msgBuild.setHeader(csProps.getHttpAuthorizatonHdr(),authorization );
// msgBuild.setHeader(csProps.getHttpContentTypeHdr(), contentType);
// msgBuild.setHeader(csProps.getHttpAcceptTypeHdr(),acceptHdr);
outMessage = msgBuild.build();
logger.debug(" ************** buildHttpOutboundGatewayRequest End*************************");
logger.debug(outMessage);
logger.debug(" ************************************************************************");
return outMessage;
}
Any ideas on what's wrong here?

Answer 1

Your problem is because you wrap one message to another.
What your buildMessageForMultipart(multipartMap); does?
I'm sure the simple map as payload and those header would be enough.
Not sure what is the point to wrap one message to another.