Changing JDK Vendor with bootBuildImage to Redhat JDK 21

[asgreflexx]

Hi,

didn't want to create a bug or feature request so I am trying it that way.

We are currently using a Spring Boot application which uses the bootBuildImage Gradle Task to create our images. So far so good that works. My current customer wants to use a redhat jdk21 and not the provided bellsoft jdk. Is there anyway to achieve this?

Cheers Michael

My gradle task:

tasks.named("bootBuildImage") {

    builder = "paketobuildpacks/builder-ubi8-base"

    pullPolicy = "IF_NOT_PRESENT"
    environment["BP_JVM_VERSION"] = "21"
    imageName.set("<myimageregistry>/<systemname>/${project.name}:${project.version}")

    buildpacks = ["urn:cnb:builder:paketo-buildpacks/java", "docker.io/paketobuildpacks/elastic-apm"]

    bindings = [rootDir.toString() + "/bindings/elastic-apm:/platform/bindings/elastic-apm"]
}

[dmikusa]

We don't have a JVM vendor buildpack that would install RedHat JDK. Redhat does provide some buildpack support though, so you could try that. I believe this is the latest doc for that -> https://developers.redhat.com/articles/2024/06/18/build-applications-paketo-buildpacks-and-red-hat-ubi-container-images#

[dmikusa]

The article uses pack, but you should be able to do the same things with the Boot Build Tools, see https://docs.spring.io/spring-boot/gradle-plugin/packaging-oci-image.html#build-image.customization.