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Run a docker image built by Jib with multiple main class an choose to the main to execute at Runtime

I have a java gradle project with multiple main class, i want to build a docker image with Jib and chose which main class to run when i execute docker run.

Is it possible to do this with Jib or i have to build multiple docker image for each main class i have ?

If i dont choose a mainclass in jib gradle config, it failed with :

Multiple valid main classes were found: ...

I try with a custom entrypoint, but no success for now, but i dont no how to pass the MainClass as an argument

container {
   entrypoint = ['/bin/sh', '-c', 'java -cp $( cat /app/jib-classpath-file ) MainClass']
}
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  1. Chosen as BEST ANSWER
    0

    I finally found a solution quite simple with jib :

    container {
    entrypoint = ['/bin/sh', '-c', 'java -cp $( cat /app/jib-classpath-file ) $MAINCLASS']
}

    and

    docker run -it -e MAINCLASS=HelloWorldJob image:1.0.0

  2. 0

    Container runtimes (e.g., Docker, Kubernetes, etc.) provide a way to override the entrypoint set in an image to whatever value you want. For example, with the Docker engine, you could do

    $ docker run -it --entrypoint java image:1.0.0 -cp /app/resources:/app/classes:/app/libs/* example.HelloJarWorld

    If i dont choose a mainclass in jib gradle config, it failed with :

    Multiple valid main classes were found: ...

    If you problem is the failure above due to multiple main classes, you can set container.mainClass to your desired main class.

    Property Type Default Description
    mainClass String Inferred** The main class to launch your application from. The value can also be initialized lazily with a provider.
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