<!-- Hibernate properties for building SessionFactory. -->
   <bean id="hibernateProperties"
      class="org.springframework.beans.factory.config.PropertiesFactoryBean">
      <property name="properties">
         <props>
             <!-- Enable Hibernate's automatic session context management -->
                <prop key="current_session_context_class">thread</prop>         
            <prop key="hibernate.jdbc.batch_size">${hibernate.jdbc.batch_size}</prop>
            <prop key="hibernate.connection.driver_class">${hibernate.connection.driver_class}</prop>
            <prop key="hibernate.dialect">${hibernate.dialect}</prop>
            <prop key="hibernate.show_sql">${hibernate.show_sql}</prop>
            <prop key="hibernate.hbm2ddl.auto">${hibernate.hbm2ddl.auto}</prop>
            <prop key="hibernate.format_sql">${hibernate.format_sql}</prop>
            <prop key="hibernate.use_sql_comments">${hibernate.use_sql_comments}</prop>
            <prop key="hibernate.generate_statistics">${hibernate.generate_statistics}</prop>
            <prop key="hibernate.transaction.factory_class">${hibernate.transaction.factory_class}</prop>
            <prop key="hibernate.search.analyzer">${hibernate.search.analyzer}</prop>
            <prop key="hibernate.search.default.directory_provider">${hibernate.search.default.directory_provider}</prop>
            <!--  prop key="hibernate.search.default.indexBase">${hibernate.search.default.indexBase}</prop --> <!-- Un-comment this when using a FSDirectoryProvider (in jdbc.properties) -->
            <prop key="hibernate.search.default.optimizer.operation_limit.max">${hibernate.search.default.optimizer.operation_limit.max}</prop>
            <prop key="hibernate.search.default.optimizer.transaction_limit.max">${hibernate.search.default.optimizer.transaction_limit.max}
            </prop>
         </props>
      </property>
   </bean>

hibernate.search.default.directory_provider=org.hibernate.search.store.RAMDirectoryProvider