is there a sample project available which combines...

# exposed

[Tristan Blakers]

is there a sample project available which combines exposed with spring, webflux, and coroutines?

[Tristan Blakers]

once things get complicated, e.g. trying to do one transaction across multiple repos, I tend to bump into various exceptions that seem to be caused by the transaction being bound to a ThreadLocal rather than a coroutine context...

[waltermcq]

you may want to try the #spring channel, and also #coroutines

[Joel]

@Tristan Blakers that's my tooling. Basically use newSuspendedTransaction instead of transaction in a coroutine context.

[Tristan Blakers]

Thanks for replying!

I tried using newSuspendedTransaction but ran into the same issues. Reading through the source code, it's not clear to me how this could work with Spring, as currently implemented

[Tristan Blakers]

reason being that in the SpringTransactionManager provided by Exposed, it ultimately calls

override fun currentOrNull(): Transaction? = TransactionSynchronizationManager.getResource(this) as Transaction?

which calls into Spring's TransactionSynchronizationManager, which stores the current transaction state in a Threadlocal

[Joel]

I see. I only use the transaction manager in blocking contexts. It should still be able to open a transaction on the thread in which the function is executed, but any suspend points within that function may have issues.

[Joel]

@Tristan Blakers what I've done as a general solution (and to get around the default-db-is-the-last-one issue) is injecting a Database connection that wraps my Hikari datapool, and then call Exposed natively from there.

[Joel]

We also use Axon Framework for CQRS and the SpringTransactionManager plays really well with that.