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

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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 SDKClientException-Unable to find a region via the region provider chain. What am I doing wrong? or is there a typo that I missed.

public class CreateS3Bucket {

public static void main(String[] args) throws IOException {

    BasicAWSCredentials creds = new BasicAWSCredentials("aws-access-key", "aws-secret-key");
    AmazonS3 s3Client = AmazonS3ClientBuilder.standard().withCredentials(new AWSStaticCredentialsProvider(creds)).build();

    Region region = Region.getRegion(Regions.US_EAST_1);
    s3Client.setRegion(region);

    try {
        String bucketName = "testBucket" + UUID.randomUUID();
        s3Client.createBucket(bucketName);
        System.out.println("Bucket Created Successfully.");

    } catch(AmazonServiceException awse) {

        System.out.println("This means that your request made it AWS S3 but got rejected");
        System.out.println("Error Message:" +awse.getMessage());
        System.out.println("Error Message:" +awse.getErrorCode());
        System.out.println("Error Message:" +awse.getErrorType());
        System.out.println("Error Message:" +awse.getRequestId());

    } catch (AmazonClientException ace) {

        System.out.println("The Amazon Client encountered an Error with network Connectivity");
        System.out.println("Error Message:" + ace.getMessage());
    }


}

}

Q2: What code changes needs to be done if I want to build a Lambda Function out of it? I'm aware how to create a lambda function and roles that it needs. Just need to know if the code that I have written needs to changed. How should I implement the LambdaFuctionHandler class as below:

import com.amazonaws.services.lambda.runtime.Context;
import com.amazonaws.services.lambda.runtime.RequestHandler;

 public class LambdaFunctionHandler implements RequestHandler<String, String> {

@Override
public String handleRequest(String input, Context context) {
    context.getLogger().log("Input: " + input);


    return null;
}

}

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

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

AWS Java SDK, AWS Java SDK - Unable to find a region via the region provider chain. public static void main(String[] args) throws IOException { AmazonS3 s3Client = AmazonS3ClientBuilder.standard().withCredentials(new AWSStaticCredentialsProvider(creds)).build(); s3Client.setRegion(region); } catch(AmazonServiceException awse) { } 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 an SDKClientException-Unable to find a region via the region provider chain .

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.

AmazonS3ClientBuilder.defaultClient() fails to account for region , Regarding Q1, try to build your client using the following syntax: AmazonS3 amazonS3 = AmazonS3Client.builder() .withRegion("us-east-1") . I have my application running on EC2. Trying to access dynamoDB via SDK from my Java application. But for every operation, I get "Unable to load AWS credentials from any provider in the chain". I have added dynamoDB permissions in the IAM role that gets attached to EC2 instance; And also configured EC2 to assume that role in trust relationship

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)

"Unable to find a region via the region provider chain" exception with , java:21) Is this an AWS SDK Bug? Is there some "region default provider chain" or some mechanism to derive the region from the Environment� AWS Java SDK-Unable to find a region via the region provider chain (3) 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.

This worked for me.

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

Set up AWS Credentials and Region for Development, 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. Any explicit region set by using withRegion or setRegion on the builder itself takes precedence over anything else. The AWS SDKs and CLIs use provider chains to look for AWS credentials in a number of different places, including system/user environment variables and local AWS configuration files. This topic provides basic information about setting up your AWS credentials for local application development using the AWS SDK for Java.

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();

AWS Region Selection - AWS SDK for Java, To connect to any of the supported services with the AWS SDK for Java, you must provide AWS credentials. The AWS SDKs and CLIs use provider chains to look� If the default credential chain or a specific or custom provider or provider chain doesn’t work for your code, you can set credentials that you supply explicitly. If you’ve retrieved temporary credentials using AWS STS, use this method to specify the credentials for AWS access.

AWS Region Selection, You must use client builders to have the SDK automatically detect the region your code is running in. To use the default credential/region provider chain to� Each of these methods is discussed in the following sections. Use the Default Credential Provider Chain. When you initialize a new service client without supplying any arguments, the AWS SDK for Java attempts to find AWS credentials.

Supplying and Retrieving AWS Credentials, If you don't explicitly set a region using the region method, the SDK consults the default region provider chain to try and determine the region to use. I am trying to connect to AWS IoT. But it fails saying "com.amazonaws.SdkClientException: Unable to find a region via the region provider chain. Must provide an explicit region in the builder or setup environment to supply a region."

com.amazonaws.client.builder.AwsClientBuilder , SDK for Java attempts to find AWS credentials. It uses the default credential provider chain implemented Region region = Region. it for the user specifically or across the system. If you are using the aws cli make sure the user has permission to create the bucket and if the bucket name matches the requirements as mentioned below :The bucket name can be between 3 and 63 characters long, and can contain only lower-case characters, numbers, periods, and dashes.

Comments
  • Better to use Regions.US_EAST_1.
  • Hard-coding a Region in your app is almost certainly a bad idea.