@Nonnull
    List<Project> getProjects();

    /**
     * Returns the plugin context for mojo being executed and the specified
     * {@link Project}, never returns {@code null} as if context not present, creates it.
     *
     * <strong>Implementation note:</strong> while this method return type is {@link Map}, the
     * returned map instance implements {@link java.util.concurrent.ConcurrentMap} as well.
     *

    // Backward compat

    /**
     * Returns the plugin context for given key ({@link PluginDescriptor#getPluginLookupKey()} and
     * {@link MavenProject}, never returns {@code null} as if context not present, creates it.
     *
     * <strong>Implementation note:</strong> while this method return type is {@link Map}, the returned map instance
     * implements {@link ConcurrentMap} as well.
     *
     */

        // topological order of the projects, and therefore can potentially change the build order.
        //
        // Note that participants may affect the topological order of the projects but it is
        // not expected that a participant will add or remove projects from the session.
        //

        graphResult = buildGraph(session);

        if (graphResult.hasErrors()) {

                }
                Artifact artifact;
                if (d.getScope().equals(Artifact.SCOPE_TEST) || d.getScope().equals(Artifact.SCOPE_PROVIDED)) {
                    /* don't call createDependencyArtifact as it'll ignore test and provided scopes */
                    artifact = artifactFactory.createArtifact(
                            d.getGroupId(), d.getArtifactId(), d.getVersion(), d.getScope(), d.getType());
                } else {

                            null,
                            "must not be 'local'"
                                    + ", this identifier is reserved for the local repository"
                                    + ", using it for other repositories will corrupt your repository metadata.");
                }

                validateStringNotEmpty(problems, "mirrors.mirror.url", mirror.getUrl(), mirror.getId());

    /**
     * Module information for the path specified at construction time.
     * This map is usually either empty if no module was found, or a singleton map.
     * It may however contain more than one entry if module hierarchy was detected,
     * in which case there is one key per sub-directory.
     *
     * <p>This map may contain null values if the constructor was invoked with {@code resolve}

 * is thread safe.
 * <p>
 * Important: Given the instance of supplier memorizes the supplier {@link RepositorySystem} instance it supplies,
 * their lifecycle is shared as well: once supplied repository system is shut-down, this instance becomes closed as
 * well. Any subsequent {@code getXXX} method invocation attempt will fail with {@link IllegalStateException}.

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

/**
 * Assists in resolving the dependencies of a plugin. <strong>Warning:</strong> This is an internal utility class that
 * is only public for technical reasons, it is not part of the public API. In particular, this class can be changed or
 * deleted without prior notice.
 *
 * @since 3.0
 */
@Named
@Singleton

    <dependency>
      <groupId>org.apache.maven.resolver</groupId>
      <artifactId>maven-resolver-transport-file</artifactId>
    </dependency>
    <!-- HTTP/1.1, lowest priority, Java8+ (still must as some ITs force it) -->
    <dependency>
      <groupId>org.apache.maven.resolver</groupId>
      <artifactId>maven-resolver-transport-wagon</artifactId>
    </dependency>
    <!-- HTTP/1.1, medium priority, Java8+ -->
    <dependency>

      <name>Plugin</name>
      <version>1.0.0+</version>
      <description>Mapping information for a single plugin within this group.</description>
      <comment>NOTE: plugin version is _NOT_ included here, since it is resolved using a separate algorithm in plugins' artifact.</comment>
      <fields>
        <field>
          <name>name</name>
          <type>String</type>
          <required>true</required>