The spring-boot-maven-plugin can create an OCI image from a jar or war file using Cloud Native Buildpacks.
By default it uses a buildpack calledpaketo-buildpacks/bellsoft-liberica which is based onBellsoft Liberica JDK.
The list of all Java buildpacks is available inPaketo Buildpacks Reference.
To choose another JVM in spring-boot-maven-plugin, first you need to find the buildpacks that are used by default. Runmvn spring-boot:build-image and look for something like this:
[INFO] [creator] ===> DETECTING[INFO] [creator] 6 of 26 buildpacks participating[INFO] [creator] paketo-buildpacks/ca-certificates 3.6.1[INFO] [creator] paketo-buildpacks/bellsoft-liberica 10.1.0[INFO] [creator] paketo-buildpacks/syft 1.27.0[INFO] [creator] paketo-buildpacks/executable-jar 6.6.3[INFO] [creator] paketo-buildpacks/dist-zip 5.5.2[INFO] [creator] paketo-buildpacks/spring-boot 5.23.0That´s the list of buildpacks being used. We need to change Bellsoft Liberica to the desired JVM.
So, to useMicrosoft OpenJDK, copy the buildpacks from above, but changepaketo-buildpacks/bellsoft-liberica togcr.io/paketo-buildpacks/microsoft-openjdk. Thepom.xml should be:
<plugin><groupId>org.springframework.boot</groupId><artifactId>spring-boot-maven-plugin</artifactId><configuration><image><buildpacks><buildpack>paketo-buildpacks/ca-certificates</buildpack><buildpack>gcr.io/paketo-buildpacks/microsoft-openjdk</buildpack><buildpack>paketo-buildpacks/syft</buildpack><buildpack>paketo-buildpacks/executable-jar</buildpack><buildpack>paketo-buildpacks/dist-zip</buildpack><buildpack>paketo-buildpacks/spring-boot</buildpack></buildpacks></image></configuration></plugin>Now, runmvn spring-boot:build-image and verify that Microsoft OpenJDK is being used:
[INFO] [creator] Paketo Buildpack for Microsoft OpenJDK 3.0.1[INFO] [creator] https://github.com/paketo-buildpacks/microsoft-openjdk...[INFO] [creator] Microsoft OpenJDK 17.0.6: Contributing to layer[INFO] [creator] Downloading from https://aka.ms/download-jdk/microsoft-jdk-17.0.6-linux-x64.tar.gzTop comments(0)
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