modelVersion. This is required so that a change from modelVersion 4.0.0 to
  4.1.0 doesn't cause compatibility problems with users who have not upgraded
  their projects. It also allows for a certain amount of legacy support into the
  future. Therefore, we should rename this file from pom.xml in the maven-core
  jarfile to pom-4.0.0.xml (and successive revisions to the base pom made to

which might be interesting to read and for further discussion.

Getting Started
---------------

+ Make sure you have a [JIRA account](https://issues.apache.org/jira/).
+ Make sure you have a [GitHub account](https://github.com/signup/free).
+ If you're planning to implement a new feature, it makes sense to discuss your changes
  on the [dev list](https://maven.apache.org/mailing-lists.html) first.

import org.apache.maven.api.annotations.Nonnull;
import org.apache.maven.repository.internal.DefaultModelVersionParser;

import static org.apache.maven.internal.impl.Utils.nonNull;

/**
 * A wrapper class around a maven resolver artifact.
 */
public class DefaultArtifact implements Artifact {
    private final @Nonnull InternalSession session;
    private final @Nonnull org.eclipse.aether.artifact.Artifact artifact;

import org.apache.maven.api.VersionConstraint;
import org.apache.maven.api.annotations.Nonnull;

import static org.apache.maven.internal.impl.Utils.nonNull;

/**
 * A wrapper class around a maven resolver artifact.
 */
public class DefaultArtifactCoordinate implements ArtifactCoordinate {
    private final @Nonnull InternalSession session;
    private final @Nonnull org.eclipse.aether.artifact.Artifact coordinate;

import org.apache.maven.api.VersionConstraint;
import org.apache.maven.api.annotations.Nonnull;

import static org.apache.maven.internal.impl.Utils.nonNull;

/**
 * A wrapper class around a maven resolver artifact.
 */
public class DefaultArtifactCoordinate implements ArtifactCoordinate {
    private final @Nonnull InternalSession session;
    private final @Nonnull org.eclipse.aether.artifact.Artifact coordinate;

import org.apache.maven.api.services.VersionParser;
import org.apache.maven.api.services.model.ModelVersionParser;

import static org.apache.maven.internal.impl.Utils.nonNull;

/**
 * A wrapper class around a resolver version that works as model version parser as well.
 */
@Named
@Singleton
public class DefaultVersionParser implements VersionParser {
    private final ModelVersionParser modelVersionParser;

    @Inject

import java.util.List;

import org.apache.maven.api.model.InputLocation;

/**
 * Collects problems that are encountered during model building. The primary purpose of this component is to account for
 * the fact that the problem reporter has/should not have information about the calling context and hence cannot provide
 * an expressive source hint for the model problem. Instead, the source hint is configured by the model builder before

import org.apache.maven.api.ArtifactCoordinate;
import org.apache.maven.api.Version;
import org.apache.maven.api.annotations.Nonnull;

import static org.apache.maven.internal.impl.Utils.nonNull;

/**
 * A wrapper class around a maven resolver artifact.
 */
public class DefaultArtifact implements Artifact {
    private final @Nonnull InternalSession session;
    private final @Nonnull org.eclipse.aether.artifact.Artifact artifact;

import org.apache.maven.api.services.VersionParser;
import org.apache.maven.model.version.ModelVersionParser;

import static org.apache.maven.internal.impl.Utils.nonNull;

/**
 * A wrapper class around a resolver version that works as model version parser as well.
 */
@Named
@Singleton
public class DefaultVersionParser implements VersionParser {
    private final ModelVersionParser modelVersionParser;

    @Inject

import org.apache.maven.api.spi.ModelParserException;

/**
 * Collects problems that are encountered during model building. The primary purpose of this component is to account for
 * the fact that the problem reporter has/should not have information about the calling context and hence cannot provide
 * an expressive source hint for the model problem. Instead, the source hint is configured by the model builder before