Spring Boot 2.3.0 buildpack builds image with creation date 40 years ago

Question

I've tried to use buildpack in a maven project with Spring Boot 2.3.0 running:

mvn spring-boot:build-image

Image was created just fine, but I see the following info for it:

REPOSITORY                                    TAG                     IMAGE ID            CREATED             SIZE
gcr.io/paketo-buildpacks/builder              base-platform-api-0.3   daceb4f909b7        40 years ago        690MB
myimage                                       master                  a482a4a34379        40 years ago        285MB

Why does it say the image (along with the builder) was created 40 years ago?

Answer 1

This is by design. In order to create reproducible builds (i.e. so that layers can be reused) the buildpack must create layers with a fixed time stamp. Otherwise, you wouldn’t be able to reuse the layers you created in previous builds because they would have different time stamps.