v2.20.1 bug or a feature?

[Artur Jablonski]

Hey,

I bumped into this one today and not sure if this is a bug or a feature :).

The example is in SpringBoot application, if that makes any difference

Given this route:

from("direct:bugOrFeature")
    .to("bean:mybean?method=transform");

and the bean method:

public String transform(@Body String in)
{
    return "I want to change the body!";
}

if I call it like this:

String result =
    template.request("direct:bugOrFeature",
                     e -> e.getIn().setBody("Some input"))
            .getIn()
            .getBody(String.class);

logger.info("result: {}", result);

Then it prints out the old value:
> result: Some input

However if I stick a dummy processor at the end of the route

from("direct:bugOrFeature")
    .to("bean:camelMaintenanceRoutes?method=transform")
    .process(e -> {});

then suddenly the same call gives me the new value
> result: I want to change the body!

Is this a bug or am I missing something?

Note that if I request for a body like this:

template
    .requestBody("direct:bugOrFeature", "some input", String.class)

then it get's the 'new' value without the dummy processor.
The thing is that I need to get out some headers from response, so I need
Exchange object and not just the body.

Best,
Artur