<bean id="entityManagerFactory"
  class="org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean"
  p:dataSource-ref="dataSource"
  p:persistenceUnitName="pu">

  <property name="packagesToScan" value="..."/>
  <property name="jpaVendorAdapter">
    <bean class="org.springframework.orm.jpa.vendor.HibernateJpaVendorAdapter" />
  </property>

  <property name="jpaPropertyMap">
    <map>
      ...
      <entry key="hibernate.jdbc.fetch_size" value="200"/>
      ...
    </map>
  </property>
</bean>