[MNGSITE-379] Unable to get example of Maven 3 lifecycle extension to work

• Type: Bug
• Status: Closed
• Priority: Major
• Resolution: Invalid
• Assignee: Unassigned
• Reporter: Andreas Brieg
• Created: 23/Oct/19 13:36
• Updated: 20/Apr/20 12:31
• Resolved: 05/Jan/20 12:21

Description

I'm trying to create an extension for maven following the description on https://maven.apache.org/examples/maven-3-lifecycle-extensions.html. However I'm unable to get this to work. I have attached the extension I created based on the example description as test-extension.zip.

After running mvn install on the extension and trying to use the extension in an example project like in maven-extension-usage.zip the execution listener implemented in the extension is not loaded nor listening to any event.

When looking in the artifact created for the extension I see that there is a generated META-INF/plexus/components.xml contained as expected.

<?xml version="1.0" encoding="UTF-8"?>
<component-set>
  <components>
    <component>
      <role>org.apache.maven.execution.ExecutionListener</role>
      <role-hint>default</role-hint>
      <implementation>org.example.testextension.Foo</implementation>
      <description />
      <isolated-realm>false</isolated-realm>
    </component>
  </components>
</component-set>

Maven also tries to download the extension from the repo when building maven-extension-usage.

Where is the error here and what should the example page for a maven extension better document?