Configuration of the MongoDB Dead-Letter Queue with Spring

@Configuration
public class AxonConfig {
  // omitting other configuration methods...
  @Bean
  public ConfigurerModule deadLetterQueueConfigurerModule(
          MongoTemplate mongoTemplate
  ) {
    // Replace "my-processing-group" for the processing group you want to configure the DLQ on.
    return configurer -> configurer.eventProcessing().registerDeadLetterQueue(
            "my-processing-group",
            config -> MongoSequencedDeadLetterQueue.builder()
                                                 .processingGroup("my-processing-group")
                                                 .maxSequences(256)
                                                 .maxSequenceSize(256)
                                                 .mongoTemplate(mongoTemplate)
                                                 .transactionManager(config.getComponent(TransactionManager.class))
                                                 .serializer(config.serializer())
                                                 .build()
    );
  }
}