Idiomatic way to create a BOM in a Maven multi-module

[Stefano Cordio]

I would like to add a BOM for AssertJ.

My current attempt is at assertj/assertj#2748 where I include in the dependencyManagement section what I'd like to have in the BOM and I configure the flatten-maven-plugin with the bom flatten mode.

However, if I don't specify resolve as element handling for dependencyManagement, ${project.version} does not get expanded.

The additional configuration parameter is not a problem but I am wondering if there is a more idiomatic way to add a BOM for a Maven multi-module.

[KimJohn Quinn]

I have the same issue. I do not want the dependencies to be resolved and include all the transitive dependencies. It turns a 100 line POM into a 15,000 line pom.

I tried with a dummy variable and using interpolate but that Renovate has problems with that. Using FlattenDependencyMode with direct did not work either.

[Hack Kampbjørn]

Here is what we do

        <configuration>
          <flattenMode>bom</flattenMode>

          <!-- Beside standard bom flatten mode, expand dependency version and remove the properties -->
          <pomElements>
            <build>remove</build>
            <dependencyManagement>resolve</dependencyManagement>
            <properties>flatten</properties>
          </pomElements>
        </configuration>