Unexpected Maven project file name WARNING message

Issue

In the logs of my job, I can see a message like the one below:

[WARNING] [jenkins-event-spy] Unexpected Maven project file name 'NONSTANDARDNAME.xml', problems may occur

Environment

CloudBees CI (CloudBees Core)
CloudBees CI (CloudBees Core) on modern cloud platforms - Managed controller
CloudBees CI (CloudBees Core) on modern cloud platforms - Operations Center
CloudBees CI (CloudBees Core) on traditional platforms - Client controller
CloudBees CI (CloudBees Core) on traditional platforms - Operations Center
CloudBees Jenkins Enterprise
CloudBees Jenkins Enterprise - Managed controller
CloudBees Jenkins Enterprise - Operations center
Jenkins LTS

Explanation

This WARNNING message comes from jenkins-event-spy which belongs to pipeline-maven-plugin. AbstractMavenEventHandler.java doesn’t support non standard pom.xml file names which can cause trouble on your build.

Workarounds

To get rid of this WARNING, you must use the standard name pom.xml instead of NONSTANDARDNAME.xmlfor your Maven project.
Naming your pom.xml differently is not recommended. Nevertheless, if you really want not to rename your pom files and have a non-standard name, you could use a generic shell step sh without using the maven step withMaven. This way you would not be using the pipeline-maven plugin but calling local mvn commands inside your sh step instead.

Tested product/plugin versions

Jenkins LTS 2.164.2
Pipeline Maven plugin 3.7.1

References

AbstractMavenEventHandler.java