spring-cloud-aws not able to put files to S3 when run from EC2

Question

I am trying to put some files in S3 bucket through my Spring Boot app using AmazonS3Client. In AWS, I created an IAM user (test_user1) and granted S3 full access rights to this user. Also in S3, I granted "s3:*" actions to this user. The same user's credentials are specified for cloud.aws.credentials.accessKey and cloud.aws.credentials.secretKey in my config files.

When I run the app from my local computer, it works fine. I am able to put multiple files in S3 bucket and view the files.

But, when the same app is run from an AWS EC2 instance, I get bellow errors at application start:

Caused by: org.springframework.beans.BeanInstantiationException: Failed to instantiate org.springframework.cloud.aws.core.env.stack.config.StackResourceRegistryFactoryBean]: Factory method 'stackResourceRegistryFactoryBean' threw exception; nested exception is com.amazonaws.AmazonServiceException: User: arn:aws:iam::560600000009:user/test_user1 is not authorized to perform: cloudformation:DescribeStackResources (Service: AmazonCloudFormation; Status Code: 403; Error Code: AccessDenied;

Is there something else I have to set when accessing S3 from code running in EC2 instance? I am not using Amazon Cloud Formation.

Here is how my project looks like:

build.gradle :

compile 'org.springframework.cloud:spring-cloud-aws-autoconfigure:1.0.3.RELEASE'
compile 'org.springframework.cloud:spring-cloud-aws-context:1.0.3.RELEASE'

application.yml:

bucket: test-bucket-1
cloud.aws.credentials.accessKey: AxxxxxxxxxxxxxxA
cloud.aws.credentials.secretKey: jxxxxxxxxxxxxxxR
cloud.aws.credentials.instanceProfile:  true

AmazonS3Client is autowired in my service class.

@Autowired
public FileService(AmazonS3Client s3Client) {..}

Answer 1

Spring Cloud AWS tries to autoconfigure CloudFormation (when the app runs in EC2).

I solved this error disabling autoconf in application.properties

cloud.aws.stack.auto=false

Read this for more info http://cloud.spring.io/spring-cloud-aws/spring-cloud-aws.html#_automatic_cloudformation_configuration.