Using JPA with AxonServerQueryBus

Imported from Google Groups
1

Hi,

I am trying to use Axon Server for a QueryBus only. At the moment JPA event and token stores are autoconfigured (Axon 4.0 with exclusion for axon-server-connector) and are connected to a h2 in memory database.

However, when I am removing the exclusion and explicitly providing beans for JpaTokenStore, JpaEventStorageEngine and EmbeddedEventStore I get the following exception from my TrackingEventProcessor:

o.a.e.TrackingEventProcessor : Fetch Segments for Processor ‘productsearch’ failed: org.hibernate.hql.internal.ast.QuerySyntaxException: DomainEventEntry is not mapped [SELECT MIN(e.globalIndex) - 1 FROM DomainEventEntry e]. Preparing for retry in 60s

Am I missing something or need I to provide more beans myself to override what AxonServerAutoConfiguration has configured? Or should I exlcude AxonServerAutoConfiguration and configure only the AxonServerQueryBus by myself?

Thanks in advance!

2

Hi Thomas,

this error is caused by the fact that JpaAutoConfiguration for the JpaEventStore isn’t triggered, as there already is an Event Store.
If you have provided your an @EntityScan annotation, you should add “org.axonframework.eventsourcing.eventstore.jpa” as one of the scanned packages. If you don’t have it, you can use Axon’s
@RegisterDefaultEntities(packages = {
“org.axonframework.eventsourcing.eventstore.jpa”
})
to add the correct packages to the ones scanned by default.

Obvisouly, we heavily recommend to keep using AxonServer… :slight_smile:

Cheers,

Allard