Java 不可变构造函数注入Kotlin类的正确方法

用Spring+Kotlin声明不可变构造函数注入类的正确方法是什么？目前我有：

@RestController
public class AuthorizationController
{
    @Inject
    lateinit var facebookAuth: FacebookAuthorizationService //Mutable?

    @RequestMapping("/authorization")
    public fun authorization(@RequestParam(value = "network-type", defaultValue = "Facebook") name: String,
                             @RequestParam(value = "oauth-token") oauthToken: String,
                             @RequestParam(value = "oauth-token-secret",
                                     required = false) oauthTokenSecret: String?): Authorization
    {
        //TODO: Handle other network types
        return facebookAuth.authorization(oauthToken)
    }
}

---

我希望facebookAuth属性是不可变的

科特林在这里没有太多经验，但我认为这必须由他来完成

public class AuthorizationController @Inject constructor(private val facebookAuth: FacebookAuthorizationService) {

    ...

}