Using Hibernate with Tomcat
If you use Hibernate on Tomcat you don't have to use Tomcat's JNDI-bound JDBC connections. You can let Hibernate manage the JDBC connection pool. This works on all versions of Tomcat and is very easy to configure.
First, create a hibernate.cfg.xml or hibernate.propertiesfile, as per documentation (no, property names in cfg.xml don't have to be prefixed with "hibernate.xxx"):
<!DOCTYPE hibernate-configuration PUBLIC
"-//Hibernate/Hibernate Configuration DTD//EN"
"http://hibernate.sourceforge.net/hibernate-configuration-3.0.dtd">
<hibernate-configuration>
<session-factory>
<!-- Settings for a local HSQL (testing) database. -->
<property name="dialect">org.hibernate.dialect.HSQLDialect</property>
<property name="connection.driver_class">org.hsqldb.jdbcDriver</property>
<property name="connection.url">jdbc:hsqldb:hsql://localhost</property>
<property name="connection.username">sa</property>
<property name="connection.password"></property>
<!-- Use the C3P0 connection pool. -->
<property name="c3p0.min_size">3</property>
<property name="c3p0.max_size">5</property>
<property name="c3p0.timeout">1800</property>
<!-- Disable second-level cache. -->
<property name="cache.provider_class">org.hibernate.cache.NoCacheProvider</property>
<property name="cache.use_query_cache">false</property>
<property name="cache.use_minimal_puts">false</property>
<property name="max_fetch_depth">3</property>
<!-- Print SQL to stdout. -->
<property name="show_sql">true</property>
<property name="format_sql">true</property>
<!-- Drop and then re-create schema on SessionFactory build, for testing. -->
<property name="hbm2ddl.auto">create</property>
<!-- Bind the getCurrentSession() method to the thread. -->
<property name="current_session_context_class">thread</property>
<!-- Hibernate XML mapping files -->
<mapping resource="org/MyClass.hbm.xml"/>
<!-- Hibernate Annotations (and package-info.java)
<mapping package="org.mypackage"/>
<mapping class="org.MyClass/>
-->
</session-factory>
</hibernate-configuration>
Now copy this file into your WEB-INF/classes directory of your web application. Copy hibernate3.jar into your WEB-INF/libdirectory and with it all required 3rd party libraries (see lib/README.txt in the Hibernate distribution). Don't forget to also copy your JDBC driver to common/libor WEB-INF/lib. Never ever copy anything in Tomcat into a global directory outside of your web application or you are in classloader hell!
Start Hibernate by building a
SessionFactory, as shown
here with
HibernateUtil.
This listener initializes and closes Hibernate on deployment and undeployment, instead of the first user request hitting the application:
public class HibernateListener implements ServletContextListener {
public void contextInitialized(ServletContextEvent event) {
HibernateUtil.getSessionFactory(); // Just call the static initializer of that class
}
public void contextDestroyed(ServletContextEvent event) {
HibernateUtil.getSessionFactory().close(); // Free all resources
}
}
Add it to your web.xml:
<listener>
<listener-class>org.mypackage.HibernateListener</listener-class>
</listener>
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