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    <blockquote> <p>If I stop and restart Tomcat, reinitializing my servlet and rebuilding my session factory, everything works fine. It is almost like the session factory itself is timing out? </p> </blockquote> <p>It's not the session factory but the connections used by the session factory (e.g. MySQL is well known to timeout connections after 8 hours of inactivity by default). Either:</p> <ul> <li>use a connection pool that is able to validate connections on borrow and to renew them ~or~</li> <li>increase the idle timeout on the database side</li> </ul> <hr> <blockquote> <p>OK. Suppose I use a c3P0 connection pool. How do I specify in the hibernate.cfg.xml file that I want to "validate connections on borrow" or does it do this by default?</p> </blockquote> <p>The various options when using C3P0 are documented in <a href="http://www.mchange.com/projects/c3p0/index.html#configuring_connection_testing" rel="nofollow">Configuring Connection Testing</a>. My advice would be to use the <a href="http://www.mchange.com/projects/c3p0/index.html#idleConnectionTestPeriod" rel="nofollow"><code>idleConnectionTestPeriod</code></a> parameter:</p> <blockquote> <p>The most reliable time to test Connections is on check-out. But this is also the most costly choice from a client-performance perspective. Most applications should work quite reliably using a combination of <code>idleConnectionTestPeriod</code> and <code>testConnectionsOnCheckIn</code>. Both the idle test and the check-in test are performed asynchronously, which leads to better performance, both perceived and actual.</p> <p>Note that for many applications, high performance is more important than the risk of an occasional database exception. <strong>In its default configuration, c3p0 does no Connection testing at all. Setting a fairly long <code>idleConnectionTestPeriod</code>, and not testing on checkout and check-in at all is an excellent, high-performance approach</strong>.</p> </blockquote> <p>To configure C3P0 with Hibernate, be sure to read <a href="http://www.mchange.com/projects/c3p0/index.html#hibernate-specific" rel="nofollow">the relevant instructions</a> (and to use the appropriate properties, and the appropriate files).</p>
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    1. COOK. Suppose I use a c3P0 connection pool. How do I specify in the hibernate.cfg.xml file that I want to "validate connections on borrow" or does it do this by default?
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    2. COGreat answer. Thanks!
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