spring-boot - lateinit 属性 S 尚未初始化

Question

我要注入(inject) 一个 单例 在另一个类(class) Kotlin 在 Spring Boot .

S.kt

 @Singleton
 @Component
 class S(
    private val userService: UserService,
    val companyRepo: CompanyRepo
 )

WorkingGroup.kt

    class WorkingGroup(
        override val name: String = "",
        override val desc: String = ""
    ) : Csv() {

        fun isCompatible(ct2: WorkingGroup): Boolean = this == ct2

        companion object : ICsvEnumCompanion<WorkingGroup> {

            @Inject
            private lateinit var s: S

           override val VALUES: List<WorkingGroup>
            by lazy {
                val details = s.user().company.details ?: CompanyDetails()
                details.workingGroups.map { WorkingGroup(it.name, it.desc) }
            }
    }
}

通过这段代码，我得到以下错误:

Caused by: org.zalando.problem.DefaultProblem: Internal Server Error: lateinit property s has not been initialized

我搜索此错误并找到了一些结果，例如 this ，但问题没有解决。
如何在 中注入(inject)服务伴随对象 在 Kotlin ？

Answer 1

为了让 Spring 注入(inject)伴随对象，您需要为伴随对象之外的字段创建一个 setter 。 WorkingGroup需要成为 Spring 托管 bean 才能让 Spring Autowiring 它(注入(inject)依赖项)。

@Component
class WorkingGroup(
    override val name: String = "",
    override val desc: String = ""
) : Csv() {

    fun isCompatible(ct2: WorkingGroup): Boolean = this == ct2

    companion object : ICsvEnumCompanion<WorkingGroup> {

        private lateinit var s: S

       override val VALUES: List<WorkingGroup>
        by lazy {
            val details = s.user().company.details ?: CompanyDetails()
            details.workingGroups.map { WorkingGroup(it.name, it.desc) }
        }
   }

   @Autowired
   fun setS(value: S) {
      s = value;
   }
}