AWS Java SDK - Unable to find a region via the region provider chain

Question

I have gone through the question titled \"Setting the AWS region programmatically 1\" but it doesn\'t provide all the answers I need.

Q1: I\'m getting a SDKCli

Answer 1

Well steps you can take to investigate:

Please make sure your Lambda function and S3 are in the same region. (When you use ProviderChain, it will pick up the region from the Lambda function

Also, You should not need to specify the BasicCredentials(aws-key..etc) if you are using Lambda.

Please read about Lambda Permission model (http://docs.aws.amazon.com/lambda/latest/dg/intro-permission-model.html):

Basically, the Lambda role that you assign should have permission to access S3.

All you need to configure S3 is pretty much:

private static final AmazonS3 s3Client = 
AmazonS3ClientBuilder.defaultClient();

To test it locally, make sure you have configured the AWS Credentials locally.

You can check if you have the credentials, if you go into .aws/credentials (This will contain the "aws-access-key", "aws-secret-key")

http://docs.aws.amazon.com/sdk-for-java/v1/developer-guide/setup-credentials.html

To set up your credentials locally, all you need to do is run the AWS Cli command: aws configure (http://docs.aws.amazon.com/cli/latest/userguide/cli-chap-getting-started.htm)

Answer 2

Regarding Q1, try to build your client using the following syntax:

AmazonS3 amazonS3 = AmazonS3Client.builder()
    .withRegion("us-east-1")
    .withCredentials(new AWSStaticCredentialsProvider(creds))
    .build();

Answer 3

withRegion(Regions.DEFAULT_REGION) helped me to solve my issue

return AmazonS3ClientBuilder.standard()
.withCredentials(new AWSStaticCredentialsProvider(awsCredentials))
.withRegion(Regions.DEFAULT_REGION)
.build();

Answer 4

As mentioned in the answer above you need to have S3 and lambda in same region and here's why-

If you don't explicitly set a region using the withRegion methods, the SDK consults the default region provider chain to try and determine the region to use. One of the methods used is -

The AWS_REGION environment variable is checked. If it's set, that region is used to configure the client.

And in the case of Lambda -

This environment variable is set by the Lambda container.

Finally, to use default credential/region provider chain to determine the region from the environment, use the client builder's defaultClient method.

AmazonS3 s3Client = AmazonS3ClientBuilder.defaultClient();

This is the same as using standard followed by build.

AmazonS3 s3Client = AmazonS3ClientBuilder.standard().build();

AWS Documentation: https://docs.aws.amazon.com/sdk-for-java/v1/developer-guide/java-dg-region-selection.html

More details: How to fix "Unable to find a region via the region provider chain" exception with AWS SDK

PS: Above link goes to my personal blog that has additional details on this.

Answer 5

You can try this as below

BasicAWSCredentials creds = new BasicAWSCredentials("your-accessKey", "your-secretKey");
AmazonSNS snsClient = AmazonSNSClientBuilder.standard()
        .withCredentials(new AWSStaticCredentialsProvider(creds))
        .withRegion(Regions.US_EAST_1).build();

Answer 6

This worked for me.

AmazonS3 s3Client = AmazonS3ClientBuilder.standard().withCredentials(new ProfileCredentialsProvider()).withRegion(Regions.AP_SOUTH_1).build();