hibernate/spring is trying to insert rather than save (record already exists in db) after the previous transaction failed

I have a batch interface class that creates a hibernate Session like this:

Session session = SessionFactoryUtils.getSession(sessionFactory, true);
TransactionSynchronizationManager.bindResource(sessionFactory, new SessionHolder(session));

Then it calls a service to get a list of objects from the DB, and in the batch class it iterates through that list and for each object it makes a service call to do some processing against the object.

Say on the 2nd object some nullpointerexception occurs somewhere, and i catch the exception in my batch class. Then i try to process the 3rd object and in the service when it tries to save the object, by calling HibernateDaoSupport.getSession(false).save(object) - it actually tries to insert it (and i get an error because a record already exists) instead of updating 开发者_如何学Cit.

This only happens if the previous object failed. If an exception occurs does it do something w/ that Hibernate session? Any ideas whats going on?

I have the following in my app context.xml

    <bean id="txManager" class="org.springframework.orm.hibernate3.HibernateTransactionManager">
    <property name="sessionFactory" ref="sessionFactory" />
</bean>

<tx:advice id="txAdvice" transaction-manager="txManager">
    <tx:attributes>
        <tx:method name="*" rollback-for="Throwable"/>
    </tx:attributes>
</tx:advice>
<aop:config>
    <aop:pointcut id="serviceMethods" expression="execution(* com.company.service..*.*(..))" />
    <aop:advisor advice-ref="txAdvice" pointcut-ref="serviceMethods" />
</aop:config>

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Session.save is supposed to assign an identifier to a transient instance and persisting it by doing an insert. I'm rather surprised that it doesn't do this in your first service call.

And since a NPE occurs in your service call, the transaction is rolled back (since you configured it with <tx:method name="*" rollback-for="Throwable"/>), which could explain some differences between the succeeding calls and the failing ones. I don't know what your two first lines of code are supposed to do, but as Bozho said, you should not bind resources to the TransactionSynchronizationManager yourself. It's Spring's responsibility.

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Let spring create your session and manage your transactions. The TransactionSynchornizationManager is something that you should not normally use.