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Check that those properties are actually defined in application.properties. There is also an application-aws.properties file, if the properties are only in that file then you will need to tell Spring Boot to enable the aws profile with SPRING_PROFILES_ACTIVE=aws, or add the aws properties with empty values in application.properties.

If no Spring Boot profile is activated, it will only use the properties defined in application.properties.

If you enable the aws profile, it will use use properties from application.properties as defaults, and then any matching properties defined in application-aws.properties will override those from application.properties if defined.

If what you are trying to do it only use those AWS properties when deployed to AWS, then you might need to make a Configuration object that holds those properties in it(which is a better practice than including properties with @Value in code), and make the AmazonS3 bean creation conditional on those properties being set.

Given that your project structure is a standard Maven structure, convention over configuration should apply and there should be no need to try and explicitly include application.properties with additional class path configuration. I.e everything under /src/main/resources should be available on the class path and to the application at runtime.