When exactly does JPA REQUIRES_NEW transaction commit

Question

In a spring container, with the code below:

public class A {

    @Transactional
    public void m1() {
        ...
        b.m2(); // call in a new transaction
        ...
    }

}

public class B {

    @Transactional(propagation = Propagation.REQUIRES_NEW)
    public void m2() {
        ...
    }

}

when exactly the transaction created for m2() is committed? once m2() invocation ends, or once m1() invocation ends?

When does @TransactionAttribute(TransactionAttributeType.REQUIRES_NEW) commit? answers it for EJB, but it doesn't seem to be the same behavior for JPA.

I debugged it and I can only see the effect of m2() on DB after m1() ends, but that seems odd to me, am I missing something here?

UPDATE:

I was passing the entity I retrieved in m1() to m2() and updating it from there. So, actually merging the entity in m2() solves this and Mik378 answer is correct.

Answer 1

From here:

Whether you're using the Spring Framework or EJB, use of the REQUIRES_NEW transaction attribute can have negative results and lead to corrupt and inconsistent data.
The REQUIRES_NEW transaction attribute always starts a new transaction when the method is started, whether or not an existing transaction is present.

REQUIRES_NEW starts a new transaction even if an existing transaction exist in the context.

So the short answer is: once m2() invocation ends