RabbitAutoConfiguration does not have properties for channel transacted

Spring Boot version: 1.5.9.RELEASE

Spring Boot autoconfiguration for RabbitMQ does not have properties to make the channels of the underlying RabbitTemplate transactional. A workaround is needed to enable it anyway. We did this by implementing a custom BeanPostProcessor

private static class RabbitTransactedBeanPostProcessor implements BeanPostProcessor {

    /**
     * Make RabitTemplate channel transacted because RabbitAutoConfiguration does not allow to set this
     */
    @Override
    public Object postProcessBeforeInitialization(Object bean, String beanName) throws BeansException {
      if (bean instanceof RabbitTemplate) {
        RabbitTemplate rabbitTemplate = (RabbitTemplate) bean;
        rabbitTemplate.setChannelTransacted(true);
      }

      return bean;
    }

    @Override
    public Object postProcessAfterInitialization(Object bean, String beanName) throws BeansException {
      return bean;
    }
  }

It is of course also possible to override the RabbitTemplate bean definition, but this would require duplication of the property handling logic. Could you add support for making the Rabbit channel transacted in RabbitAutoConfiguration and RabbitProperties?

Start with RabbitAutoConfiguration and RabbitProperties to trace how RabbitMQ settings reach the auto-configured RabbitTemplate. Add support for configuring transactional channels through those components, then verify that the resulting RabbitTemplate honors the setting and that existing property handling remains intact.