SFTP to REST using Camel - rest

Question

I am very new to camel. I want to pull some xml file from a sftp location and feed the content to existing REST endpoint. Below is my configuration,
<route id="xml.FOEBRE">
<from uri="<sftp server uri>"/>
<marshal>
<string/>
</marshal>
<setHeader headerName="Content-Type">
<constant>application/xml</constant>
</setHeader>
<doTry>
<to uri="<REST URI>?httpMethod=POST"/>
<bean ref="myListener" method="onPushSuccess"/>
<doCatch>
<exception>java.lang.Exception</exception>
<!--<log message="error : ${exception.message}" loggingLevel="ERROR"/>-->
<process ref="globalExceptionListener"/>
</doCatch>
</doTry>
</route>
I am able to call it, but I want to capture the response status and body of the REST call. In my success processor I have written,
Message message = exchange.getIn();
int status = message.getHeader(Exchange.HTTP_RESPONSE_CODE, Integer.class);
LOG.debug("Response status : {}", status);
LOG.debug("Payload successfully sent to securecargo");
String body = message.getBody(String.class);
LOG.debug("Response Body : {}", body);
This code is returning me the proper response body. But the same code (in catch listener) is not working when the status code is 400. I have two question,
How to catch this response body when status code is 400? My processor in catch block is never invoked.
Why I getting this body in exchange.getIn(), not in exchange.getOut()?
Note: My REST service returns two status, 201 for success and 400 for failure. I know my service returns a JSON payload both in success and failre scenario.

Answer 1

You'll get the response code from headers inside getIn() method instead. By facing any issue (I mean, HTTP-call errors) other than the expected response, an exception will be thrown and set into the exchange properties (Exchange.EXCEPTION_CAUGHT).

Answer 2

Finally I got the answer
My processor was getting invoked, but encounters a NPE while excuting the processor body and that exception was internally consumed by camel
During an exception, all exception related information can be retrieved from exception object itself rather than In/Out
Below is my exception handler (processor) code,
HttpOperationFailedException cause = exchange.getProperty(Exchange.EXCEPTION_CAUGHT, HttpOperationFailedException.class);
LOG.error(cause.getMessage());
final String responseBody = cause.getResponseBody();
LOG.error(responseBody);