延迟属性 S 尚未初始化

Question

我想在Spring靴中通过kotlin在另一个类中注入一个单例。

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

我搜索了这个错误，发现了一些类似的结果，但是问题没有解决。< br >在kotlin中，如何在伴随对象中注入服务？

Answer 1

为了让Spring注入到伴侣对象中，您需要为伴侣对象之外的字段创建一个setter。WorkingGroup需要是Spring托管bean才能让Spring自动装配它（注入依赖项）。

@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;
   }
}