Building Quarkus with Buildpacks uses Liberica as JDK

[fniephaus]

Describe the bug

When following the docs on building Quarkus with Buildpacks, I end up with a container that uses Liberica as the JDK.

Expected behavior

Mandrel is used a the JDK, or the user is given a choice which JDK to use.

Actual behavior

Liberica is used as the JDK.

How to Reproduce?

$ git clone --depth 1 https://github.com/quarkusio/quarkus-quickstarts.git
$ cd quarkus-quickstarts/getting-started
$ ./mvnw quarkus:add-extension -Dextensions='container-image-buildpack'
$ ./mvnw install -Dquarkus.container-image.build=true
# ...
===> EXPORTING
Reusing layer 'paketo-buildpacks/ca-certificates:helper'
Reusing layer 'paketo-buildpacks/bellsoft-liberica:helper'
Reusing layer 'paketo-buildpacks/bellsoft-liberica:java-security-properties'
Reusing layer 'paketo-buildpacks/bellsoft-liberica:jre'
Adding 1/1 app layer(s)
Reusing layer 'buildpacksio/lifecycle:launcher'
Reusing layer 'buildpacksio/lifecycle:config'
Adding label 'io.buildpacks.lifecycle.metadata'
Adding label 'io.buildpacks.build.metadata'
Adding label 'io.buildpacks.project.metadata'
no default process type
Saving ubuntu/getting-started:1.0.0-SNAPSHOT...
*** Images (336e9b9fad07):
      ubuntu/getting-started:1.0.0-SNAPSHOT
Adding cache layer 'paketo-buildpacks/bellsoft-liberica:jdk'
Adding cache layer 'paketo-buildpacks/syft:syft'
Adding cache layer 'paketo-buildpacks/maven:application'
Adding cache layer 'paketo-buildpacks/maven:cache'
[INFO] Buildpack build complete, with exit code 0
# ...

Output of uname -a or ver

No response

Output of java -version

No response

Quarkus version or git rev

No response

Build tool (ie. output of mvnw --version or gradlew --version)

No response

Additional information

No response

[quarkus-bot]

/cc @Karm (mandrel), @galderz (mandrel), @zakkak (mandrel)

[zakkak]

Thanks for reporting this @fniephaus.

[zakkak]

@iocanel if I understand correctly we are not setting a builder image by default and thus buildpack uses paketo-buildpacks/bellsoft-liberica.

Since in general we don't test Quarkus with Liberica NIK and there is no buildpack using Mandrel, the next best choice for Quarkus seems to be GraalVM CE, i.e. paketo-buildpacks/graalvm/. WDYT?