JpaRepository save flushes all entities

Question

I am using jpatransactionmanager in spring data jpa and provider is Hibernate.

<bean id="transactionManager" class="org.springframework.orm.jpa.JpaTransactionManager">
        <property name="entityManagerFactory" ref="entityManagerFactoryBean" />
</bean>

I have three entities say Aentity, Bentity. A and B has one to one relation. There is a third entity Centity. Persistence of Centity is independent of Aentity and Bentity. However, I have found whenever Centity is saved Aentity and Bentity are flushed automatically to db. I want to control this behaviour and want to ensure that they should be persisted when i call save using their repository.

Other Info: Aentity has cascase on for B. Transaction Info for Centity is : Propogation: requires new and isolation=default

I have looked in many forums but could not find hint/solution.

Answer 1

May be autocommit is enabled hence entities are flushing to database as soon you are calling save method. Try using this.

<tx:annotation-driven transaction-manager="transactionManager" proxy-target-class="true" />
<bean id="transactionManager"
class="org.springframework.orm.hibernate3.HibernateTransactionManager">
<property name="sessionFactory" ref="sessionFactory" />

Answer 2

If you do some modification in related objects which you do not want to store in database, you should detach them from entityManager like this:

    static void applyToEntity(User user, EntityManager entityManager) {

        entityManager.detach(user); //Detach object because temp settings can be    accidentally stored
        entityManager.detach(user.client) //Detach object because of temp settings can be accidentally stored

        user.client.showActivityContacts = true;
        user.allowRoles = true;
 }

It will cause these objects will not be saved in cascade because of they will not be managed anymore.