AWS S3 Java SDK - Access Denied

The problem is now solved. There were following issue to the code:

1. The end point was not correct, There should be a correct end point.
2. There was not enough permission given to the bucket. A list of complete permission should be taken before using the bucket in AWS SDK.

Below is the correct code

AWSCredentials credentials = new BasicAWSCredentials(accessKey, secretKey);
ClientConfiguration clientConfig = new ClientConfiguration();
clientConfig.setProtocol(Protocol.HTTP);
AmazonS3 conn = new AmazonS3Client(credentials, clientConfig);
conn.setEndpoint("correct end point");
Bucket bucket = conn.createBucket(bucketName);
ObjectListing objects = conn.listObjects(bucket.getName());
do {
    for (S3ObjectSummary objectSummary : objects.getObjectSummaries()) {
            System.out.println(objectSummary.getKey() + "\t" +
                    objectSummary.getSize() + "\t" +
                    StringUtils.fromDate(objectSummary.getLastModified()));
    }
    objects = conn.listNextBatchOfObjects(objects);
} while (objects.isTruncated());

Go to IAM and check whether the user [ Access Key & Secret Key ] which is being used for the API has the previliges to use S3 Based API.

Attached S3 Policy to the specified User - try with S3 Full Access; you can fine-grain the access once this works. For More Information Check this Link [ Managing IAM Policies ]

I was getting the same exception and this is how I fixed it.

The S3 bucket objects were encrypted using service-side KMS. I had to add the app/lambda role as a user to the encryption key.