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Do I understand Spring @Transactional behaviour correctly?


By : K-SIS
Date : October 16 2020, 11:12 PM
I think the issue was by ths following ,
Firstly, am I correct in believing that When using TransactionManager, all services which result in persistence to the database must be invoked from within a @Transactional method in order for the update to persist to the db?
code :


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Spring @Transactional v Spring Security @Secured inconsistent behaviour


By : user3869901
Date : March 29 2020, 07:55 AM
it fixes the issue When using both JDK proxies and CGLib You end up with TransactionInterceptor for @Transactional and MethodSecurityInterceptor for @Secured.
But those two MethodInterceptors use diffrent mechanisms to find annotation on given MethodInvocation.

Nested @Transactional annotation behaviour on Spring Data JPA


By : user3186247
Date : March 29 2020, 07:55 AM
it fixes the issue Your understanding is correct however automatic rollback only occurs for runtime, unchecked exceptions.
So, assuming your transaction manager is configured correctly, to rollback on a non-runtime, checked exception add the rollbackFor attribute to your transactional annotation:
code :
@Transactional(rollbackFor=Exception.class)
public void addUser() throws Exception {

}

Spring @Transactional behaviour with only one transactional data source


By : Mrinal
Date : March 29 2020, 07:55 AM
Any of those help I have an app that accesses two databases. Obviously, if I need to have a transaction span both DBs, I need to use something like two phase commit. But I don't need this king of guarantee right now, I don't need everything to be transactional. Things can crash or succeed independently, the app can handle it and not end-up in an inconsistent state. ,
Is it safe ?
code :
<tx:annotation-driven/>

<bean id="transactionManager" class="org.springframework.jdbc.datasource.DataSourceTransactionManager">
    <property name="dataSource" ref="firstDS" />
</bean>
<bean id="transactionManager2" class="org.springframework.jdbc.datasource.DataSourceTransactionManager">
    <property name="dataSource" ref="secondDS" />
</bean>
@Transactional(value="transactionManager2",propagation = Propagation.REQUIRED)
public class SecondDao {

    @Autowired
    @Qualifier("secondDS")
    private DataSource dataSource;

    public void updateStuff() {
        // updates stuff in the second database using dataSource
    }
}

Spring @Transactional read-only mode rollback behaviour


By : Ganapathi K
Date : March 29 2020, 07:55 AM
fixed the issue. Will look into that further So as far as I understand, you are worried about the roll-back. In this case a readOnly is a select statement and usually there is nothing to roll-back from a read. The only place where this is handy is when you read under a lock and when the transaction finishes you release that lock.
AFAIK readOnly will set the flushmode to FlushMode.NEVER and that is good and bad at the same time. Good, because there will no dirty checking, as described here. Bad because if you call a read/write transaction within a readOnly transaction, the transaction will silently fail to commit because the session is not flushed. This is easily testable btw - and I hope things have not changed since I've tried this.

Hibernate Session flush behaviour [ and Spring @Transactional ]


By : user3877935
Date : March 29 2020, 07:55 AM
it fixes the issue Once the "top level" @Transactional method has completed (ie the method called from your servlet), then the transaction should be committed, and the default Hibernate behaviour is to flush on the commit.
It sounds like something odd is happening and you should do a bit of investigating.
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