title: Not using @Transactional and calling persistence layer methods
body: <p>I have my services like this annotated with <code>@Transactional</code></p>
  
  <pre><code>@Transactional
  @Service
  public class Contact_Service {
     ....
  </code></pre>
  
  <p>In my Controller i don't have <code>@Transactional</code> and sometimes i use some persistence layer methods directely to search and persist my object and everything is okey :</p>
  
  <pre><code>@Controller
  public class GestionAO {
  
      ....
  
      @RequestMapping(...) 
      public String alerte() {
  
                  contact_respository.findOne(...) ;
                  ...
                  contact_respository.save(...) ;
  </code></pre>
  
  <p>My question since my controller is not in a transaction will i got some problems ?<br>
  Can my object don't get saved in some cases ?<br>
  Will i got concurrence problem ?  </p>