Event expected to arrive in integration test never arrives

[splatter0]

I met a problem when i'm using spring-modulith-events in a project, example detailed as below:
https://github.com/xjianyu/spring-modulith-events-example/blob/main/src/test/java/com/example/order/OrderTests.java

[splatter0]

create order then pay order, pay order cannot be executed

[splatter0]

@Transactional
@TransactionalEventListener
public void onOrderCreated(OrderCreated event) {
log.info("order created {}", event.getId());
orderPaidService.pay(event.getId());
}

change into

@Transactional(propagation = Propagation.REQUIRES_NEW)
@TransactionalEventListener
public void onOrderCreated(OrderCreated event) {
log.info("order created {}", event.getId());
orderPaidService.pay(event.getId());
}

It will be ok.

[odrotbohm]

As transactional event listeners are invoked during the transaction cleanup phase, marking them as @Transactional will not have the effect of actually running the method in a transactional way. Thus, and as you already have discovered, you will need to use Propagation.REQUIRES_NEW. This is one of the reasons @ApplicationModuleListener exists, as it sets up a transactional event listener with a new transaction.

I'll take this forward to the team to debate whether we can detect such a misconfiguration and report the problem to users in a reasonable way.

[odrotbohm]

I've filed spring-projects/spring-framework#30679 to make sure Spring Framework already detects that misconfiguration on application startup.