.setUserProperties(new Properties());

        List<MavenProject> projects = new ArrayList<>();

        if (pom != null) {
            MavenProject project = projectBuilder.build(pom, configuration).getProject();

            projects.add(project);
            if (includeModules) {
                for (String module : project.getModules()) {
                    File modulePom = new File(pom.getParentFile(), module);

import org.apache.maven.project.MavenProject;
import org.apache.maven.project.ProjectBuilder;
import org.apache.maven.project.ProjectBuildingException;
import org.apache.maven.project.ProjectBuildingRequest;
import org.apache.maven.project.ProjectBuildingResult;
import org.apache.maven.project.collector.DefaultProjectsSelector;
import org.apache.maven.project.collector.MultiModuleCollectionStrategy;

    /**
     * Add a resource directory to the project.
     * @param project project reference.
     * @param resourceDirectory directory.
     * @param includes include patterns.
     * @param excludes exclude patterns.
     */
    void addResource(MavenProject project, String resourceDirectory, List<String> includes, List<String> excludes);

        List<MavenProject> filtered = new ArrayList<>(projects.size());

        for (MavenProject project : projects) {
            if (whiteList.containsKey(project)) {
                filtered.add(project);
            }
        }

        return filtered;
    }

    @Override
    public String toString() {
        return getSortedProjects().toString();
    }

        for (MavenProject project : projects) {
            request.setArtifact(new ProjectArtifact(project));
            request.setArtifactDependencies(project.getDependencyArtifacts());
            request.setManagedVersionMap(project.getManagedVersionMap());
            request.setRemoteRepositories(project.getRemoteArtifactRepositories());

        return mavenSession;
    }

    @Override
    public List<Project> getProjects(List<MavenProject> projects) {
        return projects == null ? null : map(projects, this::getProject);
    }

    @Override
    public Project getProject(MavenProject project) {
        return allProjects.computeIfAbsent(project.getId(), id -> new DefaultProject(this, project));
    }

    @Override

     * Builds a project descriptor for the specified artifact.
     *
     * @param projectArtifact The POM artifact to build the project from, must not be {@code null}.
     * @param request The project building request that holds further parameters, must not be {@code null}.
     * @return The result of the project building, never {@code null}.
     * @throws ProjectBuildingException If the project descriptor could not be successfully built.
     */

  project from another, maven requires a minimum set of elements to be specified
  in each project's pom.xml.

   - [modelVersion] tells maven which version of the object model this project
       is compliant with (to support future legacy concerns)

   - [artifactId] tells maven what the artifact name is for this particular
       project. Each project should have a distinct artifactId.

#*    *##end
#*    *###
#*    *### fix project urls that are wrong in pom
#*    *##if ( $project.url.startsWith( "http://www.eclipse.org/sisu/" ) )
#*      *##set ( $project.url = 'https://www.eclipse.org/sisu/' )
#*    *##elseif ( $project.url.startsWith( "https://github.com/google/guava/" ) )
#*      *##set ( $project.url = 'https://github.com/google/guava/' )
#*    *##elseif ( $project.url.startsWith( "https://github.com/google/guice/" ) )

        return Collections.unmodifiableMap(
                new PropertiesAsMap(((DefaultProject) project).getProject().getProperties()));
    }

    @Override
    public Optional<Project> getExecutionProject(Project project) {
        // Session keep tracks of the Project per project id,
        // so we cannot use session.getProject(p) for forked projects