title: No transaction when using Spring websocket
body: <p>I have configured a websocket with @MessageMapping annotation as usual. It works perfectly but when I call to some method surrounded with @Transactional and I try to executed some updated over the database I get an error:  </p>
  
  <pre><code>javax.persistence.TransactionRequiredException: Executing an update/delete query.
  </code></pre>
  
  <p>It seems the transactional manager it is not working in this case. However, when this same method is invoked from a Rest controller everything goes well. Anybody knows what is happening? </p>
  
  <p>Thanks   </p>