+ "plugin(s) that have goals not marked as thread-safe to support parallel execution.",
                        "While this /may/ work fine, please look for plugin updates and/or "
                                + "request plugins be made thread-safe.",
                        "If reporting an issue, report it against the plugin in question, not against Apache Maven.")) {

        }
    }

    static class OwnerReentrantLock extends ReentrantLock {
        @Override
        public Thread getOwner() {
            return super.getOwner();
        }
    }

    static class OwnerReentrantReadWriteLock extends ReentrantReadWriteLock {
        @Override
        public Thread getOwner() {
            return super.getOwner();
        }
    }

    private static void warn(String msg) {

    private final Executor executor;

    public DefaultArtifactResolver() {
        int threads = Integer.getInteger("maven.artifact.threads", 5);
        if (threads <= 1) {
            executor = Runnable::run;
        } else {
            executor = new ThreadPoolExecutor(
                    threads, threads, 3, TimeUnit.SECONDS, new LinkedBlockingQueue<>(), new DaemonThreadCreator());
        }
    }

            }
            running = false;
        }

        /*
        Wait until we are sure the print-stream thread is running.
         */

        public void waitUntilRunning(boolean expect) {
            while (!running == expect) {
                try {
                    Thread.sleep(10);
                } catch (InterruptedException e) {
                    throw new RuntimeException(e);
                }

        } catch (PluginResolutionException e) {
            throw new PluginExecutionException(mojoExecution, project, e);
        }

        ClassLoader oldClassLoader = Thread.currentThread().getContextClassLoader();
        Thread.currentThread().setContextClassLoader(pluginRealm);

        MavenSession oldSession = legacySupport.getSession();

        scope.enter();

        try {

        ClassLoader originalClassLoader = Thread.currentThread().getContextClassLoader();
        try {
            for (AbstractMavenLifecycleParticipant listener :
                    getExtensionComponents(session.getProjects(), AbstractMavenLifecycleParticipant.class)) {
                Thread.currentThread().setContextClassLoader(listener.getClass().getClassLoader());

        // lookups that occur in contextualize calls in line with the right realm.
        ClassRealm oldLookupRealm = container.setLookupRealm(pluginRealm);

        ClassLoader oldClassLoader = Thread.currentThread().getContextClassLoader();
        Thread.currentThread().setContextClassLoader(pluginRealm);

        try {
            if (mojoDescriptor.isV4Api()) {

        try {
            MavenSession clone = (MavenSession) super.clone();
            // the default must become the current project of the thread that clones this
            MavenProject current = getCurrentProject();
            // we replace the thread local of the clone to prevent write through and enforce the new default value
            clone.currentProject = ThreadLocal.withInitial(() -> current);

        }

        ClassLoader oldClassLoader = Thread.currentThread().getContextClassLoader();
        try {
            Thread.currentThread().setContextClassLoader(pluginDescriptor.getClassRealm());

            return container.lookup(role, roleHint);
        } finally {
            Thread.currentThread().setContextClassLoader(oldClassLoader);
        }
    }

        assertTrue(parentFileWasFoundOnChild);

        // read projects together
        List<ProjectBuildingResult> results = projectBuilder.build(toRead, false, configuration);
        assertResultShowNoError(results);
        assertEquals(parentPom, findChildProject(results).getParentFile());
        Collections.reverse(toRead);
        results = projectBuilder.build(toRead, false, configuration);
        assertResultShowNoError(results);