I have such configuration where I defined headerHolder bean. But now it is impossible to use it in static methods, because in this case I always have anonymousUserId field equals null. But at the same time, when using autowiring, it is filled with value. Why does it work so? How can I fix it?

@Configuration
class HeaderInterceptorConfig : WebMvcConfigurer {
    override fun addInterceptors(registry: InterceptorRegistry) {
        registry.addInterceptor(anonymousUserIdInterceptor())
    }

    @Bean
    fun anonymousUserIdInterceptor(): HeaderInterceptor {
        return HeaderInterceptor(headerHolder())
    }

    @Bean
    @Scope(value = WebApplicationContext.SCOPE_REQUEST, proxyMode = ScopedProxyMode.TARGET_CLASS)
    fun headerHolder(): HeaderHolder {
        return HeaderHolder()
    }
}

open class HeaderHolder(
    var anonymousUserId: String? = null
): InitializingBean {
    // If aspects are applied to the class using CGLIB proxy, no-argument constructor is required
    constructor() : this(
        anonymousUserId = null
    )

    override fun afterPropertiesSet() {
        instance = this
    }

    companion object {
        private lateinit var instance: HeaderHolder
        fun get(): HeaderHolder {
            return instance
        }
    }
}

In this class I initialize anonymousUserId field for HeaderHolder

class HeaderInterceptor(
    private val headerHolder: HeaderHolder
) : HandlerInterceptor {
    @Throws(Exception::class)
    override fun preHandle(request: HttpServletRequest, response: HttpServletResponse, handler: Any): Boolean {
        val anonymousUserId = request.getHeader(ANONYMOUS_USER_ID_HEADER_NAME)
        headerHolder.anonymousUserId = anonymousUserId
        return true
    }

    companion object {
        const val ANONYMOUS_USER_ID_HEADER_NAME = "anonymous_user_id"
    }
}