Bug: prerequisites are not detected

[cstamas]

When doing versions:display-plugin-updates on this module https://github.com/maveniverse/mima/tree/75a06a1132103506614b33a2cba2229923e86260/demo/library-maven-plugin

I get this message:

[INFO] --------< eu.maveniverse.maven.mima.demo:library-maven-plugin >---------
[INFO] Building eu.maveniverse.maven.mima.demo:library-maven-plugin 1.0.0-SNAPSHOT [5/5]
[INFO]   from library-maven-plugin/pom.xml
[INFO] ----------------------------[ maven-plugin ]----------------------------
[INFO] 
[INFO] --- versions:2.16.0:display-plugin-updates (default-cli) @ library-maven-plugin ---
[INFO] 
[INFO] All plugins with a version specified are using the latest versions.
[INFO] 
[INFO] All plugins have a version specified.
[INFO] 
[WARNING] Project does not define minimum Maven version required for build, default is: 3.2.5
[INFO] Plugins require minimum Maven version of: 3.2.5
[INFO] 
[WARNING] Project (which is a Maven plugin) does not define required minimum version of Maven.
[WARNING] Update the pom.xml to contain
[WARNING]     <prerequisites>
[WARNING]       <maven><!-- minimum version of Maven that the plugin works with --></maven>
[WARNING]     </prerequisites>
[WARNING] To build this plugin you need at least Maven 3.2.5
[WARNING] A Maven Enforcer rule can be used to enforce this if you have not already set one up
[WARNING] See https://maven.apache.org/enforcer/enforcer-rules/requireMavenVersion.html

But https://github.com/maveniverse/mima/blob/75a06a1132103506614b33a2cba2229923e86260/demo/library-maven-plugin/pom.xml#L46-L48

While true, I have no enforcer to enforce build time Maven version.

Still, why does plugin claim I have no prerequisites, while I do?

[slawekjaranowski]

prerequisites is only used to define minimum Maven version required by plugin in run-time. IMHO it does not have impact of required Maven version in build time - even it is Maven plugin project.

So message should be the same with info about missing enforcer configuration regardless of the type of project packaging.

[jarmoniuk]

Is that correct that prerequisites can now also be used for non-plugin projects to specify the required maven version? Thus the distinction between plugin- and non-plugin projects in DisplayPluginUpdates should not be there anymore for establishing the version requirement for a POM?