title: How create an PostgreSQL connection pool using Java?
body: <p>I'm trying to use a Connection Pool, but I don't understand it right. Who implements it? The software, the driver or the database?</p>
  
  <p>How I do to have my program running using a Connection Pool? I'm using the native PostgreSQL driver.</p>
  
  <p>I need an code example. I'm doing an webcrawler and it has many connections to the database.</p>