Question

I’m using Hibernate 3.3.1GA and Spring 3.0.2 (and Maven from eclipse). I added c3p0-0.9.1 jar to classpath, and first tried this approach (configuring c3p0 within datasource bean):

<bean id="dataSource2" class="com.mchange.v2.c3p0.ComboPooledDataSource" destroy-method="close">
    <property name="driverClass" value="${ora.driverClassName}" />
    <property name="jdbcUrl" value="${ora.url}" />
    <property name="user" value="${ora.username}" />
    <property name="password" value="${ora.password}" />

    <property name="minPoolSize" value="${minPoolSize}" />
    <property name="maxPoolSize" value="${maxPoolSize}" />
    <property name="maxIdleTime" value="${maxIdleTime}" />
    <property name="maxStatements" value="${maxStatements}" />
    <property name="acquireIncrement" value="${acquireIncrement}" />
</bean>

This seems to work, as I can see c3p0 log in the eclipse console.
However, when I tried configuring it within hibernate sessionFactory properties, like this:

<bean id="sessionFactory2" class="org.springframework.orm.hibernate3.LocalSessionFactoryBean" name="sessionFactory2">
    <property name="dataSource" ref="dataSource2" />
    <property name="hibernateProperties">
        <props>
            <prop key="hibernate.dialect">org.hibernate.dialect.Oracle10gDialect</prop>
            <prop key="hibernate.show_sql">true</prop>
            <prop key="hibernate.format_sql">true</prop>
            <prop key="hibernate.query.substitutions">true 1, false 0</prop>

            <!-- C3P0 properties (hibernate.c3p0.idle_test_period)  -->
            <prop key="hibernate.connection.provider_class">org.hibernate.connection.C3P0ConnectionProvider</prop>
            <prop key="hibernate.c3p0.min_size">1</prop>
            <prop key="hibernate.c3p0.max_size">20</prop>
            <prop key="hibernate.c3p0.timeout">600</prop>
            <prop key="hibernate.c3p0.acquire_increment">1</prop>
            <prop key="hibernate.c3p0.max_statements">50</prop>

        </props>
    </property>
    <property name="mappingResources">
        <list>
                     ...
        </list>
    </property>
</bean>

this doesn’t work, c3p0 just won’t start, no output, no error, nothing…
Actually, I don’t find it so strange , because when I opened hibernate-core-3.3.1.GA jar from Maven repository, I couldn’t find org.hibernate.connection.C3P0ConnectionProvider class. I tried some other versions of hibernate (3.3.2, 3.6.0), and still same thing was happening (no C3P0ConnectionProvider class was in jar file). I treid removing connection.providerclass property, no difference.

I read a ton of related questions here and on other forums, and I can’t really understand what’s the problem. This is basically my problem, but I didn’t find it useful. Am I missing something in the properties configuration, did I name them wrong or something?

Thanks.

Answer 1

Since you are using spring data source configuration (you refer dataSource2 bean), I think, session factory bean just sets data source and Hibernate is ignoring it’s own connection configuration.

If first approach works, why would you want the second one?