throws DuplicateProjectException {
        Map<String, MavenProject> index = new LinkedHashMap<>();
        Map<String, List<File>> collisions = new LinkedHashMap<>();

        for (MavenProject project : projects) {
            String projectId = ArtifactUtils.key(project.getGroupId(), project.getArtifactId(), project.getVersion());

    public void setProjects(List<MavenProject> projects) {
        if (!projects.isEmpty()) {
            MavenProject first = projects.get(0);
            this.currentProject = ThreadLocal.withInitial(() -> first);
            this.topLevelProject = projects.stream()
                    .filter(project -> project.isExecutionRoot())
                    .findFirst()
                    .orElse(first);

  testImplementation(libs.assertk)
  testImplementation(projects.okhttpTls)
  testImplementation(libs.androidx.test.runner)
  testImplementation(libs.robolectric)
  testImplementation(libs.androidx.espresso.core)
  testImplementation(libs.squareup.okio.fakefilesystem)

  androidTestImplementation(projects.okhttpTls)
  androidTestImplementation(libs.assertk)
  androidTestImplementation(projects.mockwebserver3Junit4)

        // compute the projects mapping
        if (projects == null) {
            List<MavenProject> projects = session.getProjects();
            if (projects != null) {
                Map<String, Map<String, Map<String, MavenProject>>> map = new HashMap<>();
                projects.forEach(project -> map.computeIfAbsent(project.getGroupId(), k -> new HashMap<>())

       define the settings common to all projects at Apache -->
  <groupId>org.apache</groupId>
  <artifactId>apache</artifactId>
  <version>1</version>
  <packaging>pom</packaging>
  <name>The Apache Software Foundation</name>
  <description>
    The Apache Software Foundation provides support for the Apache community of open-source software projects.

import org.apache.maven.lifecycle.internal.builder.Builder;

/**
 * <p>
 * A {@link Builder} encapsulates a strategy for building a set of Maven projects. The default strategy in Maven builds
 * the projects serially, but a {@link Builder} can employ any type of concurrency model to build the projects.
 */
@Named("singlethreaded")
@Singleton
public class SingleThreadedBuilder implements Builder {

                .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);

  onlyIf("By default not in CI") {
    System.getenv("CI") == null
      || (project.hasProperty("containerTests") && project.property("containerTests").toString().toBoolean())
  }

  jvmArgs(
    "-Dokhttp.platform=$platform",
  )

  if (platform == "loom") {
    jvmArgs(
      "-Djdk.tracePinnedThreads=short",
    )
  }

  val javaToolchains = project.extensions.getByType<JavaToolchainService>()

        return true;
    }

    private Set<String> getReactorProjectKeys(Collection<MavenProject> projects) {
        Set<String> projectKeys = new HashSet<>(projects.size() * 2);
        for (MavenProject project : projects) {
            String key = ArtifactUtils.key(project.getGroupId(), project.getArtifactId(), project.getVersion());
            projectKeys.add(key);
        }
        return projectKeys;
    }

import org.apache.maven.lifecycle.internal.TaskSegment;

/**
 * <p>
 * A {@link Builder} encapsulates a strategy for building a set of Maven projects. The default strategy in Maven builds
 * the projects serially, but a {@link Builder} can employ any type of concurrency model to build the projects.
 * </p>
 * <strong>Note:</strong> This interface is part of work in progress and can be changed or removed without notice.
 */