CXF endpoint does not return response?

[mail4bvn]

Hello.

I have a route which may be simplyfied into

from(KAFKA_TOPIC)
   .process(...some-processors...)
   .to(SUB_ROUTE)
   .process(...next-logic...);


from(SUB_ROUTE)
   .process(...prepare...)
   .to("cxf:url?params");

my "next-logic" expects the message will be the result of CXF
conversation. But it seems CXF endpoint does not put the response of
SOAP back. It leads to my route receives my CXF request instead of CXF
response.

I've tried to 
.process(exchange ->
exchange.getIn().setBody(exchange.getOut().getBody()))

but it did not bring any effect.

My question is how to precess the CXF response in the route?


PS. Camel 3.10-3.11