"Efficient Container Images" like Spring Boot does?

[jakub-bochenski]

https://docs.spring.io/spring-boot/reference/packaging/container-images/efficient-images.html#packaging.container-images.efficient-images.layering

dependencies (for regular released dependencies) 

snapshot-dependencies (for snapshot dependencies)

application (for application classes and resources)

The bundled resource descriptors aren't really able to do this for a multi-module project.
E.g. dependency descriptor will treat all other project modules as external dependencies.

I'm using this currently (as I don't care about snapshots):

<assemblies>
    <assembly>
        <name>application</name>
        <inline xmlns="http://maven.apache.org/plugins/maven-assembly-plugin/assembly/1.1.2" xsi:schemaLocation="http://maven.apache.org/plugins/maven-assembly-plugin/assembly/1.1.2 http://maven.apache.org/xsd/assembly-1.1.2.xsd">
            <dependencySets>
                <dependencySet>
                    <useProjectArtifact>true</useProjectArtifact>
                    <includes>
                        <include>${project.groupId}:*</include>
                    </includes>
                </dependencySet>
            </dependencySets>
        </inline>
    </assembly>
    <assembly>
        <name>dependencies</name>
        <inline xmlns="http://maven.apache.org/plugins/maven-assembly-plugin/assembly/1.1.2" xsi:schemaLocation="http://maven.apache.org/plugins/maven-assembly-plugin/assembly/1.1.2 http://maven.apache.org/xsd/assembly-1.1.2.xsd">
            <dependencySets>
                <dependencySet>
                    <excludes>
                        <exclude>${project.groupId}:*</exclude>
                    </excludes>
                    <scope>runtime</scope>
                </dependencySet>
            </dependencySets>
        </inline>
    </assembly>
</assemblies>

It's relying on all modules in the project belonging to the same group, which is a common convention.

It would be nice if d-m-p provided bundled descriptors to handle this

[jakub-bochenski]

to clarify: I don't want to use Spring Boot, I just want to create layers in similar fashion