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POHow to shutdown connection pool on context unload?
 

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    <p>after developing several webapps that all had a similar setup with spring, hibernate and c3p0 as connectionpool I wanted to investigate a problem that i noticed everytime: Connectionpool keeps the connections until you shutdown tomcat (or your application server).</p> <p>Today i create the most basic project I could with these four dependencies:</p> <pre><code>org.springframework:spring-web org.springframework:spring-orm org.hibernate:hibernate-core c3p0:c3p0 </code></pre> <p>(plus the specific JDBC driver).</p> <p>My web.xml only creates a ContextLoaderListener that sets up the application context.</p> <pre><code>&lt;context-param&gt; &lt;param-name&gt;contextConfigLocation&lt;/param-name&gt; &lt;param-value&gt; /WEB-INF/applicationContext.xml &lt;/param-value&gt; &lt;/context-param&gt; &lt;listener&gt; &lt;listener-class&gt; org.springframework.web.context.ContextLoaderListener &lt;/listener-class&gt; &lt;/listener&gt; </code></pre> <p>application context consists of two beans - datasource and session factory:</p> <pre><code>&lt;bean id="sessionFactory" class="org.springframework.orm.hibernate4.LocalSessionFactoryBean"&gt; &lt;property name="dataSource" ref="dataSource" /&gt; &lt;/bean&gt; &lt;bean id="dataSource" class="com.mchange.v2.c3p0.ComboPooledDataSource"&gt; &lt;property name="driverClass"&gt; &lt;value&gt;org.postgresql.Driver&lt;/value&gt; &lt;/property&gt; &lt;property name="jdbcUrl"&gt; &lt;value&gt;jdbc:postgresql://localhost/mydb&lt;/value&gt; &lt;/property&gt; &lt;property name="user"&gt; &lt;value&gt;usr&lt;/value&gt; &lt;/property&gt; &lt;property name="password"&gt; &lt;value&gt;pwd&lt;/value&gt; &lt;/property&gt; &lt;/bean&gt; </code></pre> <p>When i start the webapp and either look into jconsole's MBeans or check my DBMS for open connections i notice the three initial connections made by c3p0.</p> <p>PROBLEM: When i tell tomcat to stop the webapp, they still remain!</p> <p>I created another ServletContextListener that only has the contextDestroyed method implemented and programatically shuts down the sessionFactory (and also deregisters the JDBC drivers which is also not done automatically). Code is:</p> <pre><code>@Override public void contextDestroyed(ServletContextEvent sce) { ... sessionFactory().close(); // deregister sql driver(s) Enumeration&lt;Driver&gt; drivers = DriverManager.getDrivers(); while (drivers.hasMoreElements()) { Driver driver = drivers.nextElement(); try { DriverManager.deregisterDriver(driver); log.info("deregistering jdbc driver: " + driver); } catch (SQLException e) { log.error("error deregistering jdbc driver: " + driver, e); } } } </code></pre> <p>But is that really it? Is there no built-in mechanism that I am not aware of?</p>
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