How to package Spring Boot Executable Jar to Docker image?

Spring Boot Gradle and Maven plugins produce single Executable Jar file as described in reference docs https://docs.spring.io/spring-boot/docs/current/reference/htmlsingle/#getting-started-first-application-executable-jar https://docs.spring.io/spring-boot/docs/current/reference/htmlsingle/#executable-jar

It would be nice if jib supports this, pack just a single file into the image and use -jar, /app/libs/app.jar option instead of -cp, /app/resources/:/app/classes/:/app/libs/*, app.Main.

How to package Spring Boot Executable Jar to Docker image? Maybe it can be possible to achieve the same effect through some jib settings?

[AlekseyChudov]

It’s too easy. I should have guessed 😃

Also dependencies should be added to make tasks work

jibBuildTar.dependsOn bootJar
jibDockerBuild.dependsOn bootJar
jibExportDockerContext.dependsOn bootJar

[coollog]

@AlekseyChudov You can configure command line options via the jib.container.jvmFlags parameter.

To use the JAR itself, you can set some configuration options to have Jib copy the JAR into the container:

build.gradle:

jib {
    extraDirectories.paths = bootJar.destinationDir
    container.entrypoint = ['java', '-jar', bootJar.archiveName]
}

Note(by @loosebazooka): We definitely do not recommend using Jib this way, but it will work.