Build multiple projects and dependencies into one jar file

Question

I want to package in a different way a Java application in order to build the associated Docker image. Basically the current configuration is to build the Docker image based on a folder containing 2 directories :

• prog : JAR files of the Java projects that have dependencies between them

• lib : libraries of the project (dependencies)

What I would like to do is to create a JAR file containing the content of those two folders.

The Java projects are not all dependent, but there is one defining objects that are used in other projects. I am currently looking for a way to package all of these projects into one JAR. I found a tool called OneJar that would solve my problem, but I am not sure if this would be the right way..

Do you have some suggestions on the way to proceed ?

Thanks !

Answer 1

With maven:

• The maven Shade plugin will make a single "uber" jar with all your dependencies. https://maven.apache.org/plugins/maven-shade-plugin/index.html

• The spotify docker-maven-plugin will build and push your image with this uber jar: https://github.com/spotify/docker-maven-plugin

You can also look at the google jib project https://github.com/GoogleContainerTools/jib