title: An SQLException was provoked, java.lang.InterruptedException, am I running out of db connections?
body: <p>So we run a Hibernate, Spring, Spring Webflow stack. From what I've read so far it might also be important to know we use c3p0-0.9.1.2.</p>
  
  <p>Over the last couple of days we've noticed the server suddenly stop. Users cannot log into the website, nothing appears to happen, the browser simply sits loading the page forever. The server logs also simply halt.</p>
  
  <p>When we notice this we shutdown the tomcat instance and all of a sudden quite a few of the following errors get logged;</p>
  
  <pre><code>13:05:57.492 [TP-Processor7]   WARN  o.h.util.JDBCExceptionReporter - SQL Error: 0, SQLState: null
  13:05:57.492 [TP-Processor7]   ERROR o.h.util.JDBCExceptionReporter - An SQLException was provoked by the following failure: java.lang.InterruptedException
  </code></pre>
  
  <p>Any ideas what these mean? Google hasn't been too helpful. Are we leaking db connections somewhere and the pool cannot gain a new session?</p>
  
  <p>We have just put in a couple new Spring Webflow flows and are experiencing a slightly increased amount of website traffic but we haven't seen this behaviour before.</p>