because they are specific for each packaging:

%{toc|fromDepth=2}

  Versions of the plugins are shared in a few constants:

%{snippet|id=versions|file=${project.basedir}/src/main/java/org/apache/maven/lifecycle/providers/packaging/AbstractLifecycleMappingProvider.java}

* Plugin bindings for <<<pom>>> packaging

    }

    public List<ArtifactVersion> retrieveAvailableVersionsFromDeploymentRepository(
            Artifact artifact, ArtifactRepository localRepository, ArtifactRepository remoteRepository)
            throws ArtifactMetadataRetrievalException {
        throw new UnsupportedOperationException("Cannot get available versions in this test case");
    }

    }

    public List<ArtifactVersion> retrieveAvailableVersionsFromDeploymentRepository(
            Artifact artifact, ArtifactRepository localRepository, ArtifactRepository remoteRepository)
            throws ArtifactMetadataRetrievalException {
        throw new UnsupportedOperationException("Cannot get available versions in this test case");
    }

                () -> newModelResolver().resolveModel(parent.getDelegate(), new AtomicReference<>()),
                "Expected 'UnresolvableModelException' not thrown.");
        assertEquals("No versions matched the requested parent version range '[2.0,2.1)'", e.getMessage());
    }

    @Test
    void testResolveParentThrowsUnresolvableModelExceptionWhenUsingRangesWithoutUpperBound() throws Exception {

        }

        for (String key : versions.keySet()) {
            if (versions.get(key) == null && managedVersions.get(key) == null) {
                InputLocation location = plugins.get(key).getLocation("");
                problems.add(
                        Severity.WARNING,
                        ModelProblem.Version.V20,
                        "'build.plugins.plugin.version' for " + key + " is missing.",

        } else {
            changed = metadata.merge(this.metadata);
        }

        // beware meta-versions!
        String version = metadata.getVersion();
        if (Artifact.LATEST_VERSION.equals(version) || Artifact.RELEASE_VERSION.equals(version)) {
            // meta-versions are not valid <version/> values...don't write them.
            metadata.setVersion(null);
        }

 */
@Named(VersionsMetadataGeneratorFactory.NAME)
@Singleton
public class VersionsMetadataGeneratorFactory implements MetadataGeneratorFactory {
    public static final String NAME = "versions";

    @Override
    public MetadataGenerator newInstance(RepositorySystemSession session, InstallRequest request) {
        return new VersionsMetadataGenerator(session, request);
    }

    @Override

import org.apache.maven.artifact.versioning.ArtifactVersion;
import org.apache.maven.repository.legacy.metadata.MetadataResolutionRequest;

/**
 * Provides some metadata operations, like querying the remote repository for a list of versions available for an
 * artifact - deprecated
 */
@Deprecated
public interface ArtifactMetadataSource extends org.apache.maven.repository.legacy.metadata.ArtifactMetadataSource {

                .map(MavenProject::getVersion)
                .collect(Collectors.collectingAndThen(Collectors.toList(), Collections::unmodifiableList));
        if (!versions.isEmpty()) {
            return versions;
        }
        return getAllProjects()
                .getOrDefault(artifact.getGroupId(), Collections.emptyMap())
                .getOrDefault(artifact.getArtifactId(), Collections.emptyMap())
                .values()

2. 3.2.4-SNAPSHOT == 3.2.4.snapshot
   3.2.4-SNAPSHOT < 3.2.4.0
3. 3.2.4.0 == 3.2.4
+----+

* Useful entry points

 * artifact version comparison {{{./apidocs/org/apache/maven/artifact/versioning/ComparableVersion.html}javadoc}},