我正在嘗試將文件上傳到 ap-southeast-1 區(qū)域中的 AWS Bucket，憑證已經(jīng)過驗(yàn)證并且是正確的。S3AsyncClientBuilder 為每個(gè)區(qū)域端點(diǎn)拋出空指針異常。（https://docs.aws.amazon.com/general/latest/gr/rande.html#s3_region）github 上的一個(gè)相關(guān)線程在簽署區(qū)域時(shí)遇到問題，但這不是問題，一旦指定了適當(dāng)?shù)膮^(qū)域。https://github.com/aws/aws-sdk-java-v2/issues/448這是訪問 AWS Bucket 的類，為了清楚起見，該行已被注釋。public class ObjectUploaderInterfaceImpl implements ObjectUploaderInterface {  private String AWS_ACCESS_KEY;  private String AWS_SECRET_KEY;  private S3AsyncClient s3Client; // Asynchronous Client for Non Blocking IO  private AwsCredentialsProvider credentials;  public ObjectUploaderInterfaceImpl(String awsAccessKey, String awsSecretKey) {    this.AWS_ACCESS_KEY = awsAccessKey;    this.AWS_SECRET_KEY = awsSecretKey;    this.credentials = new StaticCredentialsProvider(        new AwsCredentials(this.AWS_ACCESS_KEY, this.AWS_SECRET_KEY));    try {      this.s3Client = S3AsyncClient.builder()          .credentialsProvider(this.credentials)          .region(Region.AP_SOUTHEAST_1)          .endpointOverride(new URI("s3-ap-southeast-1.amazonaws.com"))          .build(); // Throws Null pointer Exception    } catch (Exception e) {      e.printStackTrace();    }  }  @Override  public CompletableFuture<PutObjectResponse> uploadObject(String filePath, String s3Bucket,      String s3BucketPath) {    CompletableFuture<PutObjectResponse> future;    try {      future = s3Client.putObject(          PutObjectRequest.builder()              .bucket(s3Bucket)              .key(s3BucketPath)              .build(),          AsyncRequestProvider.fromFile(Paths.get(filePath))      );      future.whenComplete((resp, err) -> {        if (resp != null) {          System.out.println("Response from Server : " + resp);        } else {          err.printStackTrace();        }        try {          s3Client.close();        } catch (Exception e) {          System.out.println(e);        }      });    }   }}我不確定是什么原因?qū)е逻@種情況，自 AWS-SDK 2.0 最近發(fā)布以來，文檔中提供了一些參考。