title: Lot of SHOW TRANSACTION ISOLATION LEVEL queries in postgres
body: <p>I am using Hibernate 4, PostgreSQL and C3P0. </p>
  
  <p>In my web application, after sometime I am getting multiple <code>SHOW TRANSACTION ISOLATION LEVEL</code> queries in database due to which my server gets hang. In my code all my connections are properly closed.</p>
  
  <p>Is it due to a connection leak?</p>