Practice that how to use Java to operate dynamoDb
To set these variables on Linux, macOS, or Unix, use :
export AWS_ACCESS_KEY_ID=your_access_key_id
export AWS_SECRET_ACCESS_KEY=your_secret_access_key
export AWS_REGION=your_aws_region
To set these variables on Windows, use :
set AWS_ACCESS_KEY_ID=your_access_key_id
set AWS_SECRET_ACCESS_KEY=your_secret_access_key
export AWS_REGION=your_aws_region
bazel run demo