What happens if one @Transactional annotated method is calling another @Transactional annotated method on the same object instance?

Question

I am studying how to Spring handle transaction and I am asking what happens if one @Transactional annotated method is calling another @Transactional annotated method on the same object instance?

I know that the transactional propagation defaul level is REQUIRED so if I have a method1() annotated with @Transactional of an instance of MyObject that call a method2() (annotated with @Transactional) of the same instance I think that, following the REQUIRED level, it is performed on the same transaction created by method1().

Is it my reasoning correct or am I missing something? I am not sure about what exactly happens if the 2 @Transactional methods are called on the same instance.

How it works?

Predrag Maric · Accepted Answer · 2015-03-24T10:54:47.757

16

If you call method2() from method1() within the same class, the @Transactional annotation of the second method will not have any effect because it is not called through proxy, but directly. Methods are enhanced with transactional behavior only if called through proxy (autowired bean, or some instance injected in any other way).

But generally speaking, if method1() and method2() were in different classes, and both were annotated with @Transactional (so using REQUIRED propagation), then they would share the same transaction started in method1().

edited Mar 24 '15 at 10:54

answered Mar 24 '15 at 10:43

Predrag Maric

23,938
5
52
68

6

Downvoter, care to explain? – Predrag Maric Mar 24 '15 at 10:48
1

I would also like to know why this answer got downvoted. The second paragraph should be rephrased perhaps, as it depends on the propagation level, but since the default propagation is REQUIRED the paragraph stands true. – Master Slave Mar 24 '15 at 10:53
Tnx, perfect explaination :-) – Mar 24 '15 at 13:51
@PredragMaric what if method2() sets propagation to REQUIRES_NEW ? – Mr Matrix Jan 23 '20 at 00:00
@Miguel REQUIRES_NEW will create a second transaction, which can be committed or rolled back independently of the first one. – Predrag Maric Feb 07 '20 at 12:48

What happens if one @Transactional annotated method is calling another @Transactional annotated method on the same object instance?

1 Answers1