The flow starts with the payload "Hello-" from the POST request. Since the VM-Publish processor is asynchronous, the Set Payload in the flow oneJmsQueueListener does not change the payload at this moment. Continuing to the Request processor, a "HTTP-" is being appended to the payload. Next is the VM-Publish consume processor which is synchronous and "JMS2-" is being appended to the payload. At the end of the flow, the Set Payload processor appends "Three" to the payload.
Yes exactly. Publish = Asynchronous, because message is sent and does not wait for response. Publish consume = Synchronous, because flow is waiting for response, hence changing the payload (in this specific case).
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