Strange behavior when returning ObjectNode from IntegrationFlows - spring-integration

Question

When an ObjectNode is passed from the extractFramesFlow() and reaches the httpCallbackFlow(), HTTP request is successfully performed and JSON formatted payload is 'POST'ed to the "call_back" uri specified.
#Bean
public IntegrationFlow extractFramesFlow() {
return IntegrationFlows.from(extractFramesChannel())
.handle(ObjectNode.class, (payload, headers) -> {
payload = validateFields(payload);
String path = payload.get("path").asText();
try {
File moviePath = new File(path);
ArrayNode arrayNode = mapper.createArrayNode();
String imageType = payload.path("image_type").asText("JPG");
String prefix = payload.path("prefix").asText();
Tools.thumbnails(moviePath, payload.get("slice").asInt(), payload.get("scale").asInt(),
imageType, prefix, file -> arrayNode.add(file.toString()));
payload.set("files", arrayNode);
} catch (IOException e) {
e.printStackTrace();
}
return payload;
}).enrichHeaders(h-> h.header("errorChannel", "asyncErrorChannel", true))
.<ObjectNode, Boolean>route(p-> !p.hasNonNull("id"),
m->m.channelMapping("true","httpCallbackFlow.input")
.channelMapping("false","uploadToS3Channel")).get();
}
#Bean
public IntegrationFlow httpCallbackFlow() {
return f->f.handle(Http.<JsonNode>outboundChannelAdapter(m->m.getPayload().get("call_back").asText()));
}
However, when an ObjectNode is chained from the handleAsyncErrors() flow and reaches the same httpCallbackFlow(), we get an Exception which is caused by
org.springframework.web.client.RestClientException: Could not write request: no suitable HttpMessageConverter found for request type [com.fasterxml.jackson.databind.node.ObjectNode] and content type [application/x-java-serialized-object]
at org.springframework.web.client.RestTemplate$HttpEntityRequestCallback.doWithRequest(RestTemplate.java:811)
at org.springframework.web.client.RestTemplate.doExecute(RestTemplate.java:594)
at org.springframework.web.client.RestTemplate.execute(RestTemplate.java:572)
at org.springframework.web.client.RestTemplate.exchange(RestTemplate.java:493)
at org.springframework.integration.http.outbound.HttpRequestExecutingMessageHandler.handleRequestMessage(HttpRequestExecutingMessageHandler.java:382)
... 24 more
#Bean
public IntegrationFlow handleAsyncErrors() {
return IntegrationFlows.from(asyncErrorChannel())
.<MessagingException>handle((p, h) -> {
ObjectNode objectNode = mapper.createObjectNode();
objectNode.put("call_back", "http://some.test.uri");
return objectNode;
}).channel("httpCallbackFlow.input").get();
}
I don't know why we get this Exception handled by the same exact IntegrationFlow notwithstanding.

Answer 1

The message on the error flow has no contentType header.
It is an error message with the MessagingException payload; which has 2 properties; the cause and failedMessage.
Presumably you have a content type on the main flow message. You can set the content type with a header enricher, or add
.<MessagingException, Message<?>>transform(p -> p.getFailedMessage())
before your existing error handler, to restore the headers from the failed message.