G level meta-data is not published for spotless-maven-plugin

[slawekjaranowski]

Each Maven plugin should publish G-Level meta-data.

https://maven.apache.org/repositories/metadata.html

It is missing:
https://repo.maven.apache.org/maven2/com/diffplug/spotless/maven-metadata.xml

reference:

• Something is off with prefix resolution apache/maven#11252

[nedtwigg]

happy to merge a PR for this. Here is an example of adding special stuff to the maven pom just for the maven plugin:

spotless/gradle/java-publish.gradle

Lines 156 to 162 in 9ed5d6b

	if (isPluginMaven) {
	developer {
	id 'lutovich'
	name 'Konstantin Lutovich'
	email 'konstantin.lutovich@neotechnology.com'
	}
	}

[slawekjaranowski]

I'm afraid that it is not missing stuff in pom.xml ...
It is missing meta-data, which should be generated during deployments.

[pzygielo]

• With Something is off with prefix resolution apache/maven#11252 (comment) - maybe it's the missing packaging (perhaps implicit to jar instead of explicit maven-plugin) in spotless-maven-plugin-2.46.1.pom that did not trigger Central to generate metadata for plugin?

[pzygielo]

Uploaded spotless-m-p locally - with original pom - no MD was created, and with altered pom (added packaging) - and MD was created.

I might be wrong, but based on quick nexus code check, I guess that the current manager (not sure which version in used on Central) - DOES check jar contents (i.e. inspects plugin.xml) - but only on MD rebuild. Maybe Central could be asked to regenerate MD for c.d.spotless and the file would be created. (Perhaps such task is used only on request or very rarely (once per century or so) due to volume there.)