Appendix C. Frequently asked questions
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Appendix C. Frequently asked questions

C.1. Common

C.1.1.

I'd like to get more detailed logging information on what methods are called inside JpaRepository, e.g. How can I gain them?

You can make use of CustomizableTraceInterceptor provided by Spring:

<bean id="customizableTraceInterceptor" class="
  org.springframework.aop.interceptor.CustomizableTraceInterceptor">
  <property name="enterMessage" value="Entering $[methodName]($[arguments])"/>
  <property name="exitMessage" value="Leaving $[methodName](): $[returnValue]"/>
</bean>

<aop:config>
  <aop:advisor advice-ref="customizableTraceInterceptor"
    pointcut="execution(public * org.springframework.data.jpa.repository.JpaRepository+.*(..))"/>
</aop:config>

C.2. Infrastructure

C.2.1.

Currently I have implemented a repository layer based on HibernateDaoSupport. I create a SessionFactory by using Spring's AnnotationSessionFactoryBean. How do I get Spring Data repositories working in this environment?

You have to replace AnnotationSessionFactoryBean with the LocalContainerEntityManagerFactoryBean. Supposed you have registered it under entityManagerFactory you can reference it in you repositories based on HibernateDaoSupport as follows:

Example C.1. Looking up a SessionFactory from an HibernateEntityManagerFactory

<bean class="com.acme.YourDaoBasedOnHibernateDaoSupport">
  <property name="sessionFactory">
    <bean factory-bean="entityManagerFactory" factory-method="getSessionFactory" />
  </property>
</bean>

C.3. Auditing

C.3.1.

I want to use Spring Data JPA auditing capabilities but have my database already set up to set modification and creation date on entities. How to prevent Spring Data from setting the date programmatically.

Just use the set-dates attribute of the auditing namespace element to false.

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