Spring数据源+ JPA + Hibernate + c3p0 + ehCache

Question

I want to connect to my MySQL database using the folliowing libraries:

• spring: because my webapp use the spring-mvc framework
• hibernate (JPA): because it is a standard
• c3p0: for performance
• ehCache: for performance

Here is my applicationContext.xml:

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:context="http://www.springframework.org/schema/context"
    xmlns:tx="http://www.springframework.org/schema/tx"
    xsi:schemaLocation="http://www.springframework.org/schema/beans
        http://www.springframework.org/schema/beans/spring-beans.xsd
        http://www.springframework.org/schema/tx
        http://www.springframework.org/schema/tx/spring-tx.xsd
        http://www.springframework.org/schema/context
        http://www.springframework.org/schema/context/spring-context.xsd">

    <context:component-scan base-package="dao,service" />

    <!-- Configuration du transaction manager -->
    <bean id="entityManagerFactory" class="org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean">
        <property name="dataSource" ref="dataSource" />
        <property name="packagesToScan" value="entity" />

        <property name="jpaVendorAdapter">
            <bean class="org.springframework.orm.jpa.vendor.HibernateJpaVendorAdapter"/>
        </property>
        <property name="jpaProperties">
            <props>
                <prop key="hibernate.hbm2ddl.auto">validate</prop>
                <prop key="hibernate.dialect">org.hibernate.dialect.MySQL5Dialect</prop>
                <prop key="current_session_context_class">thread</prop>
                <prop key="hibernate.cache.provider_class">org.hibernate.cache.internal.NoCacheProvider</prop>
                <!-- used for debug -->
                <prop key="hibernate.show_sql">true</prop>
                <!-- EhCache -->
                <prop key="hibernate.cache.provider_configuration_file_resource_path">classpath:ehcache.xml</prop>
                <prop key="hibernate.cache.region.factory_class">org.hibernate.cache.ehcache.EhCacheRegionFactory</prop>
                <prop key="hibernate.cache.provider_class">org.hibernate.cache.SingletonEhCacheProvider</prop>
                <prop key="hibernate.cache.use_second_level_cache">true</prop>
                <prop key="hibernate.cache.use_query_cache">true</prop>
                <prop key="hibernate.generate_statistics">true</prop>
                <!-- configuration pool via c3p0, see https://community.jboss.org/wiki/HowToConfigureTheC3P0ConnectionPool -->
                <prop key="hibernate.connection.provider_class">org.hibernate.service.jdbc.connections.internal.C3P0ConnectionProvider</prop> 
                    <prop key="hibernate.c3p0.acquire_increment">1</prop> <prop key="hibernate.c3p0.max_size">5</prop> 
                    <prop key="hibernate.c3p0.max_statements">100</prop> <prop key="hibernate.c3p0.min_size">1</prop> 
                    <prop key="hibernate.c3p0.timeout">100</prop> <prop key="hibernate.checkoutTimeout">1000</prop> 
                    <prop key="hibernate.c3p0.idleConnectionTestPeriod">30</prop> <prop key="hibernate.c3p0.preferredTestQuery">SELECT 1
                </prop>
            </props>
        </property>
    </bean>

    <!-- Configuration de la BDD -->
    <bean id="dataSource" class="org.springframework.jdbc.datasource.DriverManagerDataSource">
        <property name="driverClassName" value="com.mysql.jdbc.Driver" />
        <property name="url" value="jdbc:mysql://localhost:3306/mydb?autoReconnect=true" />
        <property name="username" value="user" />
        <property name="password" value="password" />
    </bean>

    <bean id="transactionManager" class="org.springframework.orm.jpa.JpaTransactionManager">
        <property name="entityManagerFactory" ref="entityManagerFactory" />
    </bean>

    <tx:annotation-driven />

    <bean class="org.springframework.orm.jpa.support.PersistenceAnnotationBeanPostProcessor" />
</beans>

I dont get any error but I'm not sure that c3p0 and ehCache are working :/

Answer 1

It is a bit late, but anyway.

One mistake in your XML is that you tried to configure both datasource and hibernate.c3p0 in entityManagerFactory bean. When you do this way, hibernate will not take into account any hibernate.c3p0 properties (because it will not instantiate DataSource in that case).

So, if you set datasource to EntityManagerFactory (or SessionFactory), you should consider configuring connection-pooling at Datasource side, like this (C3P0):

<bean name="dataSource" class="com.mchange.v2.c3p0.ComboPooledDataSource">
    <property name="driverClass" value="com.mysql.jdbc.Driver" />
    <property name="jdbcUrl" value="jdbc:mysql://localhost:3306/mydb?autoReconnect=true" />
    <property name="user" value="user" />
    <property name="password" value="password" />
    <property name="maxPoolSize" value="2"/>
    <property name="minPoolSize" value="1"/>
    <property name="idleConnectionTestPeriod" value="3000"/>
</bean>

or any other way you like.

This behaviour is barely documented in Spring documentation, here is what I have found .

For ComboPooledDataSource, see c3p0 documentation

As related to hibernate caching, it should work properly.