Question

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I was evaluating Multi-Tenancy feature present in Hibernate 4(4.1.0) along with Spring 3(3.1.0), but was not able to get it working with HibernateTransaction setting. I have defined settings as follows.

LocalSessionFactoryBean :

@org.springframework.context.annotation.Configuration
public class Configuration {

    @Inject private DataSource dataSource;
    @Inject private MultiTenantConnectionProvider multiTenantConnectionProvider;

    @Bean
    public LocalSessionFactoryBean sessionFactory() throws IOException{
        LocalSessionFactoryBean bean = new LocalSessionFactoryBean();
        bean.setDataSource(dataSource);
        bean.setPackagesToScan("com");
        bean.getHibernateProperties().put("hibernate.multi_tenant_connection_provider", multiTenantConnectionProvider);
        bean.getHibernateProperties().put("hibernate.multiTenancy", "SCHEMA");
        bean.getHibernateProperties().put("hibernate.tenant_identifier_resolver", new CurrentTenantIdentifierResolverImpl());
        bean.setConfigLocation(new ClassPathResource("/hibernate.cfg.xml"));
        return bean;
    }

}

Configuration.xml :

<context:component-scan base-package="com.green" />


    <context:annotation-config />

    <!-- Enable annotation style of managing transactions -->
    <tx:annotation-driven transaction-manager="transactionManager" />

    <!-- Declare a datasource that has pooling capabilities -->
    <bean id="dataSource" class="com.mchange.v2.c3p0.ComboPooledDataSource"
        destroy-method="close" p:driverClass="${app.jdbc.driverClassName}"
        p:jdbcUrl="${app.jdbc.url}" p:user="${app.jdbc.username}" p:password="${app.jdbc.password}"
        p:acquireIncrement="5" p:idleConnectionTestPeriod="60" p:maxPoolSize="100"
        p:maxStatements="50" p:minPoolSize="10" />

    <!-- Declare a transaction manager -->
    <bean id="transactionManager"
        class="com.green.saas.hibernate.SaasHibernateTransactionManager"
        depends-on="sessionFactory" >
          <property name="sessionFactory" ref="sessionFactory"></property>
          <property name="dataSource" ref="dataSource"></property>
    </bean>

If I use plain HibernateTransactionManager provided by spring 3 I get error tenant identifier not set, reason for this being, it opens a session as follows

1. Session newSession = SessionFactoryUtils.openSession(getSessionFactory( ));
2. (Session) ReflectionUtils.invokeMethod(openSessionMethod, sessionFactory) in openSession method
3. Method openSessionMethod = ClassUtils.getMethod(SessionFactory.class, "openSession") above openSessionMethod argument is defined as.

we can see that there is no hook where you can provide tenant-identifier as expected while opening a session with tenant-identifier e.g

Session newSession = getSessionFactory().withOptions().tenantIdentifier ( "abc" ).openSession();

or

class instance provided by hibernate property "hibernate.tenant_identifier_resolver" is called by which session is provided with tenant identifier.

To overcome this I extended class HibernateTransactionManager and override method doBegin and where new session is opened I opened it

getSessionFactory().withOptions().tenantIdentifier ( "abc" ).openSession();    

this makes thing click and work.

I just wanted to know, is this above approach fine or there is some setting that I am not aware of that makes it work out of the box.

Thanks in advance.

Hibernate – 4.1.0
Spring – 3.1.0

Answer 1

It looks like this feature was buggy on Hibernate side with the version you used: SPR-9222, HHH-7306.

Starting from Hibernate version 4.1.4 You should use CurrentTenantIdentifierResolver to pass the current tenant ID to SessionFactory.