我已经配置了一个spring云流kafka应用程序来使用事务（github上提供了完整的源代码）：

spring:
  application:
    name: message-relay-service
  cloud:
    stream:
      kafka:
        binder:
          transaction:
            transaction-id-prefix: message-relay-tx-
            producer:
              configuration:
                retries: 1
                acks: all
                key:
                  serializer: org.apache.kafka.common.serialization.StringSerializer

      bindings:
        output:
          destination: transfer
          contentType: application/*+avro
      schema-registry-client:
        endpoint: http://localhost:8081
      schema:
        avro:
          subjectNamingStrategy: org.springframework.cloud.stream.schema.avro.QualifiedSubjectNamingStrategy
  datasource:
    url: jdbc:h2:tcp://localhost:9090/mem:mydb
    driver-class-name: org.h2.Driver
    username: sa
    password:
  jpa:
    hibernate:
      ddl-auto: create
    database-platform: org.hibernate.dialect.H2Dialect

server:
  port: 8085

此应用程序有一个计划任务，定期检查要使用 @Scheduled 任务。此方法的注解为 @Transactional 主类定义 @EnableTransactionManagement .
但是，在调试代码时，我意识到kafkatransactionmanager没有被执行，也就是说，没有kafka事务。有什么问题吗？

@EnableTransactionManagement
@EnableBinding(Source::class)
@EnableScheduling
@SpringBootApplication
class MessageRelayServiceApplication

fun main(args: Array<String>) {
    runApplication<MessageRelayServiceApplication>(*args)
}

---

@Component
class MessageRelay(private val outboxService: OutboxService,
                   private val source: Source) {

    @Transactional
    @Scheduled(fixedDelay = 10000)
    fun checkOutbox() {
        val pending = outboxService.getPending()
        pending.forEach {
            val message = MessageBuilder.withPayload(it.payload)
                    .setHeader(KafkaHeaders.MESSAGE_KEY, it.messageKey)
                    .setHeader(MessageHeaders.CONTENT_TYPE, it.contentType)
                    .build()
            source.output().send(message)
            outboxService.markAsProcessed(it.id)
        }
    }

}