Question

我在春季启动时使用Kotlin，但遇到了有关bean创建的一些错误。

错误消息是Spring框架类中的Index 0 out of bounds for length 0

我不明白为什么导致有关此Java代码（弹簧）的异常

for (int paramIndex = 0; paramIndex < paramTypes.length; paramIndex++) {
  Class<?> paramType = paramTypes[paramIndex];
  String paramName = (paramNames != null ? paramNames[paramIndex] : ""); // Here!           
  ...
}

有可能吗？

无论如何，我想知道如何将Spring bean创建为具有属性值（@ConfigurationProperties）的kotlin内部类。

我的代码


// application.yml
naver:
  clientId: ...
  clientSecret: ...
  grantType: authorization_code
  redirectUri: ...
  accessTokenUrl: ...
  profileUrl: ...

// some codes
abstract class OAuth2Provider {
  lateinit var clientId: String
  lateinit var clientSecret: String
  lateinit var grantType: String
  lateinit var redirectUri: String
  lateinit var accessTokenUri: String
  lateinit var profileUri: String

  fun callback(code: String) = getProfiles(getAuthenticationResult(code))
  abstract fun getAuthenticationResult(code: String): AuthenticationResult
  abstract fun getProfiles(result: AuthenticationResult): Map<String, String>
}

@Component
class Providers(
  val restTemplate: RestTemplate
) {

  private fun createOauth2LoginParams(grantType: String, clientId: String, code: String): MultiValueMap<String, String> {
    val map = LinkedMultiValueMap<String, String>()
    map.add("grant_type", grantType)
    map.add("client_id", clientId)
    map.add("code", code)
    return map
  }

  private fun createOauth2HttpEntity(map: MultiValueMap<String, String>): HttpEntity<MultiValueMap<String, String>> {
    val headers = HttpHeaders()
    headers.contentType = APPLICATION_FORM_URLENCODED
    return HttpEntity(map, headers)
  }

  private fun createAuthenticationResult(url: String, entity: HttpEntity<MultiValueMap<String, String>>): AuthenticationResult {
    return restTemplate.postForObject(url, entity, AuthenticationResult::class.java)!!
  }

  private fun createProfileResponseEntity(url: String, result: AuthenticationResult): ResponseEntity<Map<*, *>> {
    val headers = HttpHeaders()
    headers.add("Authorization", result.tokenType + " " + result.accessToken)
    headers.contentType = MediaType.APPLICATION_FORM_URLENCODED

    val entity = HttpEntity<MultiValueMap<String, String>>(headers)
    return restTemplate.exchange(url, HttpMethod.GET, entity, Map::class.java)
  }

  @ConfigurationProperties("naver")
  @Component
  inner class Naver : OAuth2Provider() {

    override fun getAuthenticationResult(code: String): AuthenticationResult {
      val map = createOauth2LoginParams(grantType, clientId, code)
      map.add("client_secret", clientSecret);

      val entity = createOauth2HttpEntity(map)
      return createAuthenticationResult(accessTokenUri, entity)
    }

    override fun getProfiles(result: AuthenticationResult): Map<String, String> {
      val resultEntity = createProfileResponseEntity(profileUri, result)
      val body = resultEntity.body!!

      val uniqueId = body.get("id").toString()
      val imageUrl = body.get("profile_image").toString()

      val profiles = HashMap<String, String>()
      profiles["uniqueId"] = uniqueId
      profiles["imageUrl"] = imageUrl
      return profiles
    }
  }

}

错误

Caused by: org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'com.mubeeplayer.api.oauth2.Providers$Naver': Unexpected exception during bean creation; nested exception is java.lang.ArrayIndexOutOfBoundsException: Index 0 out of bounds for length 0
...
Caused by: java.lang.ArrayIndexOutOfBoundsException: Index 0 out of bounds for length 0
    at org.springframework.beans.factory.support.ConstructorResolver.createArgumentArray(ConstructorResolver.java:705) ~[spring-beans-5.1.7.RELEASE.jar:5.1.7.RELEASE]
    at org.springframework.beans.factory.support.ConstructorResolver.autowireConstructor(ConstructorResolver.java:218) ~[spring-beans-5.1.7.RELEASE.jar:5.1.7.RELEASE]
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.autowireConstructor(AbstractAutowireCapableBeanFactory.java:1341) ~[spring-beans-5.1.7.RELEASE.jar:5.1.7.RELEASE]
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBeanInstance(AbstractAutowireCapableBeanFactory.java:1187) ~[spring-beans-5.1.7.RELEASE.jar:5.1.7.RELEASE]
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:555) ~[spring-beans-5.1.7.RELEASE.jar:5.1.7.RELEASE]
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:515) ~[spring-beans-5.1.7.RELEASE.jar:5.1.7.RELEASE]

谢谢。对不起，我的英语。

Answer 1

这似乎是spring framework issue。

根本原因已被解释为：

MethodParameter L:781

if (function != null) { 
    List<KParameter> parameters = function.getParameters(); 
    KParameter parameter = parameters
        .stream()
        .filter(p -> KParameter.Kind.VALUE.equals(p.getKind()))
        .collect(Collectors.toList()) 
        .get(index); 
        return (parameter.getType().isMarkedNullable() || parameter.isOptional()); 
}

在DependencyDescriptor中检查所需的构造函数参数时，以上语句会过滤掉参数0，该参数是对外部类的引用，具有INSTANCE的种类值。

然后尝试基于初始输入索引访问该参数，但该流已被过滤为空。

修改

但是，嵌套类受支持并且可以按预期工作。 nested类是在kotlin中没有修饰符且在Java中没有static修饰符的类内部定义的类。另一方面，inner类是在kotlin中具有inner修饰符而在Java中没有修饰符的类内部定义的类。

Kotlin内部类作为Spring Bean

我的代码

错误

1 个答案: