I was wondering how Camel's breadcrumbId is generated?
I've POSTed a message to queue1 using the REST API and this generates a message with messageId value "X".
I've then tested the following very simple routes consuming from one queue and sending to another.
queue1 --> queue2
queue2 --> queue3
queue3 --> queue4
queue4 --> queue5
A breadcrumbId is generated in the first route with value "X".
In each route each message gets a new MessageId as per the JMS spec but the breadcrumbId remains the same.
The word "breadcrumb" gives me the impression it should change each route/exchange to allow you to trace back through the messages?
But it seems to be the MessageId of the very first message?
I can't find a description of how it is actually generated.
From Camel doc
breadcrumbId - An unique id used for tracking messages across transports
I think the value for the message is generated during the first camel processing from MessageId, and then the existing one is used.