Reset exchange properties modification when i call unmarshall in my route

[Joël Guelluy <jg...@skynet.be>]

Hello,
There is something i don't understand around conversion and loosing 
modifications on my exchange (Camel 2.25.4)

NOTE : At the end of this mail, i put a simplified version of my code 
and the traces.

My route basically does this :
1) from email with copyTo=outFolder&delete=true
2) process(myProcessor) : Inside this, i do some work, including some 
modifications, eventually an override of copyTo, and finish with a call 
of a RestWS (return (String)response).
3) .unmarshal(new JacksonDataFormat(Reply.class))
4) remaining steps (not important)

All the process is OK except 1 thing : in the traces, i see the 
modifications on the exchange before the unmarshal, and the original 
values are back after the unmarshall.

I want to keep the modified properties in the following steps of my 
route.
Do you know how i can to it ?

Joël


---------------------------------------

from(imap://server?username=xxx&password=xxx©To=ACC/out&delete=true&unseen=false&folderName=ACC/in&mapMailMessage=false)
	.routeId("mail-Reply")
	.process(myProcessor)
	.unmarshal(new JacksonDataFormat(Reply.class))
	.choice()
		.when(simple("${body.status} != 'OK'"))
		.throwException(new MyException("Error"))
	.end()
	.transform(simple("${body.file.content}"))
	.unmarshal().base64()
	...
		

public class MyProcessor implements Processor {
     @Override
     public void process(Exchange exchange) {
		IMAPMessage mainMessage = exchange.getIn().getBody(IMAPMessage.class);
		String htmlCode = extractHTML(mainMessage.getContent());
		Map<String, String> extractedData = extractData(htmlCode);
			exchange.getIn().setHeader("copyTo", "ACC/toCheck");
             exchange.getIn().setHeader("subject", "body");
		exchange.getProperties().putAll(extractedData);

		String subject = (String) exchange.getIn().getHeader("subject");
		String jsResponse = callOfA_REST_WebService()

		exchange.getIn().setBody(jsResponse);
     }
}

logs
You can see subject and copyTo in the 1st line, they disapears in the 
next line.

12:17:21.768 [Camel (camel-1) thread #3 - imap://mail.nuvem.intra] INFO 
org.apache.camel.processor.interceptor.Tracer - 
ID-PCP48141-1664187007789-0-6 >>> (mail-Reply) Processor@0x432f2970 --> 
unmarshal[org.apache.camel.component.jackson.JacksonDataFormat@207dd1b7] 
<<< Pattern:InOnly, Headers:{Accept-Language=en-US, en-AU, 
breadcrumbId=ID-PCP48141-1664187007789-0-6, Content-Language=en-US, 
Content-Type=multipart/alternative;
	boundary="...", copyTo=ACC/toCheck, Date=Fri, 26 Aug 2022 09:51:32 
+0200, From="no-reply@xxx.be" <no...@xxx.be>, Message-ID=<6be3>, 
MIME-Version=1.0, Received=[...], Subject=body, 
Thread-Index=AdjRh0ZWl+D/M9njSGaY14JVfSU0xA==, Thread-Topic=mail 
25/08/2022 14:05:03
, To="yyy@yyy.be" <yy...@yyy.be>, BodyType:String, 
Body:{"id":"Corresp_Rest:064c","status":"OK","taskStatus":null,"messages":[""],"data":{"request_id":"Corresp_Rest:2","file":{"content":"JVBER... 
[Body clipped after 1000 chars, total length is 109290]

12:17:21.786 [Camel (camel-1) thread #3 - imap://mail.nuvem.intra] INFO 
org.apache.camel.processor.interceptor.Tracer - 
ID-PCP48141-1664187007789-0-6 >>> (mail-Reply) 
unmarshal[org.apache.camel.component.jackson.JacksonDataFormat@207dd1b7] 
--> choice <<< Pattern:InOnly, Headers:{Accept-Language=en-US, en-AU, 
Content-Language=en-US, Content-Type=multipart/alternative;
	boundary="...", Date=Fri, 26 Aug 2022 09:51:32 +0200, 
From="no-reply@xxx.be" <no...@xxx.be>, Message-ID=<6be3>, 
MIME-Version=1.0, Received=[...
...], Subject=mail 25/08/2022 14:05:03, 
Thread-Index=AdjRh0ZWl+D/M9njSGaY14JVfSU0xA==, Thread-Topic=mail 
25/08/2022 14:05:03
, To="yyy@yyy.be" <yy...@yyy.be>, BodyType:be.myws.Reply, 
Body:be.myws.Reply@6e6f51d7