title: Hibernate make joins on save cascade
body: <p>Let´s say I have an entity A that has a relationship oneToMany with B with cascade ALL type and by default lazy. 
  My question now is, what happend, if now I modify A, but B keep in session exactly the same, and I save A. Hibernate will do the join with B and he will update on database, or he will keep B as hibernate proxy?.</p>
  
  <p>We´re facing some problems on our application, since MySQL is complaining for the maximum number of joins when we save the top level entity.</p>
  
  <pre><code>  ERROR 1116 (HY000): Too many tables; MySQL can only use 61 tablesin a join
  </code></pre>
  
  <p>Regards.</p>