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https://issues.apache.org/jira/browse/CAMEL-12520?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16479632#comment-16479632
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Steve Storck commented on CAMEL-12520:
--------------------------------------

It appears that DefaultFluentProducerTemplate does not care about the exchange 
that was set by .withExchange() when request() is called.  Instead, if I use 
.send(), the proper response is in the incoming message body.  Is this by 
design?  If so, then the documentation should be updated, but it seems like it 
is odd behavior for an otherwise very nice API.

> FluentProducerTemplate.withExchange() does not seem to send exchange
> --------------------------------------------------------------------
>
>                 Key: CAMEL-12520
>                 URL: https://issues.apache.org/jira/browse/CAMEL-12520
>             Project: Camel
>          Issue Type: Bug
>          Components: camel-core
>    Affects Versions: 2.19.2, 2.19.3, 2.19.4, 2.19.5, 2.20.0, 2.20.1, 2.20.2, 
> 2.20.3, 2.21.0
>         Environment: Linux and Java 8 or Java 9
>            Reporter: Steve Storck
>            Priority: Major
>         Attachments: MessageApplication.java
>
>
> When I use the following simple but complete code example:
> {code:java}
> public static void main(String[] args) throws Exception {
>     CamelContext camelContext = new DefaultCamelContext();
>     camelContext.start();
>     camelContext.addRoutes(new RouteBuilder() {
>         @Override
>         public void configure() {
>             from("direct-vm:start").process(exchange -> {
>                 String incoming = exchange.getIn().getBody(String.class);
>                 exchange.getIn().setBody("Message received: " + incoming, 
> String.class);
>             });
>         }
>     });
>     Exchange exchange = ExchangeBuilder.anExchange(camelContext)
>             .withBody("Hello!")
>             .withPattern(ExchangePattern.InOut)
>             .build();
>     System.out.println(
>             camelContext.createFluentProducerTemplate()
>             .withExchange(exchange)
>             .to("direct-vm:start")
>             .request(String.class)
>     );
> }{code}
> The message body appears to be missing, as indicated in the program output:
> {code:java}
> Message received: null{code}
> I have tried this with java 1.8 and 1.9, and with camel 2.19.2 and 2.21.1, 
> and both camel versions exhibit the same behavior when run with both java 
> versions.



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