HowToAddHibernate

Background

This page describes how to add Hibernate support to your project. The recommended practice is to add Hibernate support in its own module. Reloading a Hibernate SessionFactory can be a relatively time-consuming part of the overall project reload, so it's a good idea to separate the module which contains the SessionFactory from the one which contains the application DAOs.

Setup

1) Add a new module

Add a new 'empty' module to your project, as described in AddingModules.

You will want to give the module a name which clearly identifies it as a 'Hibernate' module.

2) Add the Hibernate libraries to your project

You can bring these into your project using an entry such as the following in dependencies.txt. Note that you will also need to add these to your host project's class path.

compile from antlr:antlr:2.7.6
compile from cglib:cglib-nodep:2.1_3
compile from commons-collections:commons-collections:2.1.1
compile from dom4j:dom4j:1.6.1
compile from net.sf.ehcache:ehcache:1.3.0
compile from org.hibernate:hibernate:3.2.3.ga
compile from hsqldb:hsqldb:1.8.0.7

3) Add the Hibernate Spring beans to your module's Spring configuration file

For example, the petclinic-hibernate module in the Petclinic Sample contains the following entry.

<bean id="propertyConfigurer"
    class="org.springframework.beans.factory.config.PropertyPlaceholderConfigurer">
    <property name="locations">
        <list>
            <value>classpath:mysql.properties</value>
        </list>
    </property>
</bean>

<bean id="dataSource"
    class="org.springframework.jdbc.datasource.DriverManagerDataSource">
    <property name="driverClassName"
        value="${jdbc.driverClassName}" />
    <property name="url" value="${jdbc.url}" />
    <property name="username" value="${jdbc.username}" />
    <property name="password" value="${jdbc.password}" />
</bean>

<bean id="sessionFactory" class="org.springframework.orm.hibernate3.LocalSessionFactoryBean">
    <property name="dataSource"><ref local="dataSource"/></property>
    <property name="mappingResources">
        <value>petclinic.hbm.xml</value>
    </property>
    <property name="hibernateProperties">
        <props>
            <prop key="hibernate.dialect">${hibernate.dialect}</prop>
            <prop key="hibernate.show_sql">true</prop>      
        </props>
    </property>
    <property name="eventListeners">
        <map>
            <entry key="merge">
                <bean class="org.springframework.orm.hibernate3.support.IdTransferringMergeEventListener"/>
            </entry>
        </map>
    </property>
</bean>

<bean id="transactionManager" class="org.springframework.orm.hibernate3.HibernateTransactionManager">
    <property name="sessionFactory"><ref local="sessionFactory"/></property>
</bean>

4) Export the relevant beans

Typically, you will want to export the DataSource, SessionFactory and PlatformTransactionManager beans, using one of the Impala service namespace. For example.

<service:export-array beanNames="dataSource,sessionFactory,transactionManager"/>

5) Import the exported beans where needed

Use one of the Impala service namespace import beans to bring these into other modules in your application, using entries such as the following:

<service:import id="dataSource" exportName = "dataSource" proxyTypes = "javax.sql.DataSource"/>

<service:import id="sessionFactory" exportName = "sessionFactory" proxyTypes = "org.hibernate.SessionFactory"/>

<service:import id="transactionManager" exportName = "transactionManager" proxyTypes = "org.springframework.transaction.PlatformTransactionManager"/>

This creates proxies which can be injected into other beans in your application.

[Anonymous]

Originally posted by: homer13....@gmail.com

Bean 'dataSource'; nested exception is java.lang.ClassNotFoundException?: Unable to find class org.springframework.jdbc.datasource.DriverManagerDataSource?