spring - 带有List 的通用bean的Spring Boot(Kotlin)自动接线失败

Question

我在批处理应用程序中定义了这个bean:

@Service("updating-processor")
class UpdatingProcessor(val searchService: searchService, val objectMapper: ObjectMapper) : ItemProcessor<SomeItem, List<OtherObject>>

我知道上面的bean是在应用程序中创建的，我在init方法中设置了一个断点，并且在调试应用程序时它会停止。

我有这个课:

@SpringBootApplication
@EnableBatchProcessing
@EnableJpaRepositories
@EnableRetry(proxyTargetClass=true)
class EtlApplication() : CommandLineRunner {
    companion object {
        val LOG = LoggerFactory.getLogger(EtlApplication::class.java.name)
    }

    @Autowired
    @Qualifier("updating-processor")
    lateinit var updatingProcessor: ItemProcessor<SomeItem, List<OtherObject>>
}

---

APPLICATION FAILED TO START

---

Description:

Field updatingProcessor in ... required a bean of type >> 'org.springframework.batch.item.ItemProcessor' that could not be found.

Action:

Consider defining a bean of type 'org.springframework.batch.item.ItemProcessor' in your configuration.

我收到一个错误消息，说“更新处理器”无法自动接线，这是由于 List<OtherObject>作为第二种类型。如果将第二个通用参数的 List<OtherObject>更改为 OtherObject，则 Autowiring 有效。

如何使它与列表一起使用？

Answer 1

这与此帖子有关-> spring-inject-list-of-generic-interface-implementations-in-kotlin

您应该可以采用Spring建议的操作:

Consider defining a bean of type 'org.springframework.batch.item.ItemProcessor' in your configuration.

例如:

@Configuration
class UpdatingProcessorConfig {
    @Autowired
    lateinit var searchService: SearchService
    @Autowired
    lateinit var objectMapper: ObjectMapper

    @Bean
    fun updatingProcessor(): ItemProcessor<SomeItem, List<OtherObject>> = UpdatingProcessor(searchService, objectMapper)
}

class UpdatingProcessor(val searchService: SearchService, val objectMapper: ObjectMapper) :
        ItemProcessor<SomeItem, List<OtherObject>> {
    override fun process(p0: SomeItem): List<OtherObject>? {
        TODO("not implemented")
    }
}