Blog: Migration Spring Integration 2.x to 3.x with Jackson2 (finally): http://www.knallisworld.de/blog/2014/02/05/expose-a-java-method-with-amqp-using-spring-integration/

ApiImpl_v1.java

@Service("api")
public class ApiImpl {
  public Response handle(Request request) {
    // Do some stuff and return a response object
  }
}

ApiImpl_v2.java

@Service("api")
public class ApiImpl {
  @ServiceActivator
  public Response handle(@Payload Request request) {
    // Do some stuff and return a response object
  }
}

config_amqp_v1.xml

<beans>
  <int-amqp:inbound-gateway
    connection-factory="connectionFactory" 
    request-channel="requestChannel"
    reply-channel="resultChannel" 
    error-channel="errorChannel"
    queue-names="queue"/>
</beans>

config_channels.xml

<beans>
    <int:channel id="requestChannel"/>
    <int:channel id="resultChannel"/>
</beans>

config_channels2.xml

<beans>
    <int:channel id="requestChannel"/>
    <int:channel id="requestChannelJson"/>
    <int:channel id="resultChannel"/>
    <int:channel id="resultChannelJson"/>
    
    <int:chain input-channel="requestChannelJson" output-channel="requestChannel">
        <int:json-to-object-transformer type="your.package.to.Request"/>
    </int:chain>

    <int:chain input-channel="resultChannel" output-channel="resultChannelJson">
        <int:object-to-json-transformer/>
    </int:chain>
</beans>

config_serviceactivator_v1.xml

<beans>
    <int:service-activator ref="api" input-channel="requestChannel" output-channel="resultChannel" />
</beans>