Possible bug when using transactions and TransactionalEventListener

[jsaramago]

Hi,

I'm trying to use transactions and TransactionalEventListener, but it seams that spring have some incompatibly issue with this in the version 3.1.1 (I had this working on the version 2.7.13).

When the transaction is committed the TransactionalEventListener isn't been triggered and on the logs I got this entry:

2023-07-05T10:48:35.333+01:00 DEBUG 6435 --- [       cb-txn-6] actionalApplicationListenerMethodAdapter : No transaction is active - skipping org.springframework.context.PayloadApplicationEvent[source=org.springframework.boot.web.servlet.context.AnnotationConfigServletWebServerApplicationContext@65e61854, started on Wed Jul 05 10:48:32 WEST 2023]

Also if I check my bucket I got some extra documents with binary values:

In the file couchbaseTransactions.zip is possible to check my current approach to get this working.

[mikereiche]

The couchbase transaction does get processed and TransactionalApplicationListenerMethodAdapter.onApplicationEvent() does get triggered with the event having the DataCreated object as the payload. But it falls through to the 'else'.

	@Override
	public void onApplicationEvent(ApplicationEvent event) {
		if (TransactionSynchronizationManager.isSynchronizationActive() &&
				TransactionSynchronizationManager.isActualTransactionActive()) {
			TransactionSynchronizationManager.registerSynchronization(
					new TransactionalApplicationListenerSynchronization<>(event, this, this.callbacks));
		}
		else if (this.annotation.fallbackExecution()) {
			if (this.annotation.phase() == TransactionPhase.AFTER_ROLLBACK && logger.isWarnEnabled()) {
				logger.warn("Processing " + event + " as a fallback execution on AFTER_ROLLBACK phase");
			}
			processEvent(event);
		}
		else {
			// No transactional event execution at all
			if (logger.isDebugEnabled()) {
				logger.debug("No transaction is active - skipping " + event);
			}
		}
	}

[jsaramago]

Hi @mikereiche, we saw this same behaviour in our side. I think that the problem is that spring doesn't know that there is an active transaction. With this, spring should be aware that a transaction is running because the event is sent inside a method that is annotated with @Transactional. This line of thought is correct?

[mikereiche]

Yes.
This worked in 2.7.13? With which version of spring-data-couchbase?
I don't think that spring-data-couchbase transactions uses TransactionSynchronizationManager, so this behavior doesn't surprise me. The check for being in a couchbase transaction is

org.springframework.data.couchbase.core.TransactionSupport.checkForTransactionInThreadLocalStorage() [ the method name is a bit of a misnomer].

Couchbase transactions probably needs to be calling TransactoinSynchronizationManager.bindResource() / unbindResource().

[jsaramago]

This worked with spring boot 2.7.13 and with spring dependency management 1.0.15.RELEASE. I don't know what was the spring-data-couchbase version.