title: Nested @Transactional
body: <p>Is it possible to nest @Transactional annotated methods in spring? Consider something like this:</p>
  
  <pre><code>@Transactional
  public void a() {
      obj.b();
  }
  
  @Transactional
  public void b() {
      // ... 
  }
  </code></pre>
  
  <p>What happens in such a case if I rollback in b() and rollback in a() ?</p>