about Spring integration reference's JMS part

[Twitch Xi]

Hi all,
On page 142 of Spring integration reference(2.0.3),before the subtitle 'JMS Backed Message Channels' ,I found that 'it will still be wrapped within the HeaderMappingMessageConverter',is that right?Because I found in the source code:

org.springframework.integration.jms.ChannelPublishingJmsMessageListener
private volatile MessageConverter messageConverter = new SimpleMessageConverter();

thanks.