Discuss VMware 2V0-72.22 Exam Topic 9 Question 78

Refer to the exhibit.

Assume that the application is using Spring transaction management which uses Spring AOP internally.

Choose the statement that describes what is happening when the update1 method is called? (Choose the best answer.)

AThere are 2 transactions because REQUIRES_NEW always runs in a new transaction.

BAn exception is thrown as another transaction cannot be started within an existing transaction.

CThere is only one transaction because REQUIRES_NEW will use an active transaction if one already exists.

DThere is only one transaction initiated by update1() because the call to update2() does not go through the proxy.

Suggested Answer: D

When using Spring transaction management with annotation-driven mode, the @Transactional annotation will be processed by a TransactionInterceptor that implements the AOP advice interface. This interceptor will be applied to the target bean through a proxy that implements the same interface as the target bean. Therefore, when a method of the target bean is called from outside, it will actually invoke the proxy method, which will delegate to the interceptor and then to the actual target method.

However, when a method of the target bean is called from within the same bean, it will not go through the proxy and thus bypass the interceptor logic. In this case, when update1() calls update2(), it will not start a new transaction as specified by REQUIRES_NEW propagation level, but rather join the existing transaction initiated by update1() itself.

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29 comments · newest first

Shelton 6 months ago

B seems right. Exceptions are common in nested transactions.

Mel 7 months ago

I’m with C. REQUIRES_NEW should use the active one.

Mari 7 months ago

A makes sense. Two transactions are better for isolation.

Pearly 7 months ago

I lean towards D. update2() doesn't go through the proxy.

Lavelle 7 months ago

I feel B is correct. Can't start a new one in an existing.

Timmy 7 months ago

C) is definitely wrong, it doesn't use the existing one.

Terrilyn 8 months ago

Wait, I thought REQUIRES_NEW always creates a new transaction?

Alethea 8 months ago

D) sounds right since it's about proxy calls.

Belen 8 months ago

A) is correct, REQUIRES_NEW starts a new transaction.

Brendan 8 months ago

B) An exception is thrown as another transaction cannot be started within an existing transaction.

Dean 9 months ago

Haha, I bet the exam writers are having a field day with these Spring AOP questions!

Jettie 9 months ago

D) There is only one transaction initiated by update1() because the call to update2() does not go through the proxy.

Dan 9 months ago

C) There is only one transaction because REQUIRES_NEW will use an active transaction if one already exists.

Pete 9 months ago

I’m a bit confused about whether an exception would be thrown. I thought REQUIRES_NEW could start a new transaction even if one exists.

Dominga 9 months ago

I think I came across a similar question where it mentioned that if a method is called directly, it might not go through the proxy. That makes me lean towards option D.

Lavera 9 months ago

I feel pretty good about this one. The key is understanding how REQUIRES_NEW works - it will always start a new transaction, even if there's an existing one. So option A is the correct answer, since there will be 2 separate transactions. I'll go with that.

Buddy 10 months ago

I'm a bit confused by this question. The way I understand it, REQUIRES_NEW should always start a new transaction, so I'm not sure why option C would be correct. I'll need to review my notes on Spring transaction management to make sure I have the right understanding.

Sue 10 months ago

Okay, let me think this through step-by-step. The question says the application is using Spring transaction management, and that REQUIRES_NEW is being used. Based on that, I think option C is the best answer, since REQUIRES_NEW will reuse an existing transaction if there is one. I'll mark that one.

Thaddeus 10 months ago

I think it's A. REQUIRES_NEW starts a new transaction.

Edda 10 months ago

I remember studying how REQUIRES_NEW works, but I'm not entirely sure if it creates a new transaction or not.

Gregoria 11 months ago

I disagree, B) makes more sense here.

Lucia 11 months ago

I feel like option A is correct since REQUIRES_NEW should always start a new transaction, but I need to double-check that.

Freeman 11 months ago

Hmm, this is a tough one. I'm leaning towards option C, since I remember from the lectures that REQUIRES_NEW will use an existing transaction if there is one. But I'm not 100% confident, so I'll need to double-check the details.

Soledad 11 months ago

I'm not sure about this one. The question seems to be testing our understanding of Spring transaction management, which can be tricky. I'll need to carefully read through the options and think about how REQUIRES_NEW works.

Ariel 6 months ago

↳ replying to Soledad

I’m confused. This is a tricky one for sure!

Brianne 6 months ago

↳ replying to Soledad

I agree with Quinn. New transaction for update1 is likely.

Lanie 6 months ago

↳ replying to Soledad

Option D makes sense too. The proxy issue could affect the transaction.

Lenita 6 months ago

↳ replying to Soledad

I'm leaning towards B. An exception might occur with nested transactions.

Quinn 10 months ago

↳ replying to Soledad

I think it's option A. REQUIRES_NEW always starts a new transaction.

VMware 2V0-72.22 Exam - Topic 9 Question 78 Discussion