title: Spring message TTL does not work
body: <p>I am using spring-amqp 1.5.2 and would like to publish message which can reside in the queue for at most 10 seconds:</p>
  
  <p>I am setting the expiration to 10000 (10 seconds) for all my messages but the messages are still in the queue after 10 seconds. Here is my code snippet:       </p>
  
  <pre><code>MessageProperties props = new MessageProperties();
  
  props.setExpiration("10000");
  
  Message message = new Message(event.toByteArray(), props); 
  this.rabbitTemplate.convertAndSend("my-exchange", "my-routing-key", message);
  </code></pre>