Hi,
I’m experiencing a NullPointerException on config in AxonConfiguration when the JpaEventStorageEngine is created in the following spring configuration:
`
import org.axonframework.common.jdbc.PersistenceExceptionResolver;
import org.axonframework.common.jpa.EntityManagerProvider;
import org.axonframework.common.transaction.TransactionManager;
import org.axonframework.config.SagaConfiguration;
import org.axonframework.eventhandling.EventBus;
import org.axonframework.eventhandling.EventMessage;
import org.axonframework.eventhandling.interceptors.EventLoggingInterceptor;
import org.axonframework.eventsourcing.eventstore.EmbeddedEventStore;
import org.axonframework.eventsourcing.eventstore.EventStorageEngine;
import org.axonframework.eventsourcing.eventstore.jpa.JpaEventStorageEngine;
import org.axonframework.messaging.MessageHandlerInterceptor;
import org.axonframework.messaging.interceptors.LoggingInterceptor;
import org.axonframework.serialization.Serializer;
import org.axonframework.serialization.upcasting.event.EventUpcaster;
import org.axonframework.spring.config.AxonConfiguration;
import org.axonframework.spring.eventhandling.scheduling.java.SimpleEventSchedulerFactoryBean;
import org.axonframework.spring.eventsourcing.SpringAggregateSnapshotterFactoryBean;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.transaction.PlatformTransactionManager;
import my.saga.PricingSaga;
import java.util.function.Function;
@Configuration
public class AxonConfig {
// @Autowired
// public void configure(List<SagaConfiguration<?>> sagaConfigurations) {
// sagaConfigurations.forEach(sc -> sc.registerHandlerInterceptor(c -> new LoggingInterceptor<>()));
// }
@Bean(name = “eventBus”)
public EmbeddedEventStore eventStore(EventStorageEngine storageEngine) {
EmbeddedEventStore eventStore = new EmbeddedEventStore(storageEngine);
eventStore.registerDispatchInterceptor(new EventLoggingInterceptor());
return eventStore;
}
@Bean
public EventStorageEngine eventStorageEngine(Serializer serializer,
PersistenceExceptionResolver persistenceExceptionResolver,
AxonConfiguration configuration,
EntityManagerProvider entityManagerProvider,
TransactionManager transactionManager) {
return new JpaEventStorageEngine(
serializer,
configuration.getComponent(EventUpcaster.class), // !!HBD!! //
persistenceExceptionResolver,
5, //batchSize -> defaults to 100 if null
entityManagerProvider,
transactionManager,
1L, //lowestGlobalSequence -> defaults to 1 if null
100, //maxGapOffset -> defaults to 10000 if null
true);
}
@Bean
public SimpleEventSchedulerFactoryBean eventScheduler(EventBus eventBus,
PlatformTransactionManager transactionManager) {
SimpleEventSchedulerFactoryBean eventSchedulerFactory = new SimpleEventSchedulerFactoryBean();
eventSchedulerFactory.setEventBus(eventBus);
eventSchedulerFactory.setTransactionManager(transactionManager);
return eventSchedulerFactory;
}
@Bean
public SpringAggregateSnapshotterFactoryBean springAggregateSnapshotterFactoryBean() {
return new SpringAggregateSnapshotterFactoryBean();
}
@Bean
public SagaConfiguration pricingSagaConfiguration() {
return SagaConfiguration.trackingSagaManager(PricingSaga.class)
.registerHandlerInterceptor(loggingInterceptor(PricingSaga.class)); // ?HBD? //
}
/**
*Some beans, including aggregates and repositories, omitted for brevity
*/
private Function<org.axonframework.config.Configuration, MessageHandlerInterceptor<? super EventMessage<?>>> loggingInterceptor(Class loggerName) {
return (config) -> new LoggingInterceptor<>(loggerName.getName());
}
}
`
The step that’s failing is configuration.getComponent(EventUpcaster.class), due to the config object in AxonConfiguration still being null at this point, apparently because afterPropertiesSet() has not yet been called:
@Override public void afterPropertiesSet() throws Exception { config = configurer.buildConfiguration(); }
What’s most confusing is that removing the LoggingInterceptor from the SagaConfiguration makes this problem disappear
How should I correctly set up these beans, considering the spring lifecycle?