Files.writeString(mavenUserProps, "${includes} = ?${session.rootDirectory}/.mvn/maven.properties\n");
        Path rootDirectory = fs.getPath("C:\\myRootDirectory");
        Path topDirectory = rootDirectory.resolve("myTopDirectory");
        Path mvn = rootDirectory.resolve(".mvn");
        Files.createDirectories(mvn);
        Files.writeString(

                    public Object getValue(String expression) {
                        if ("rootDirectory".equals(expression)) {
                            Path root = rootLocator.findMandatoryRoot(projectDir);
                            return root.toFile().getPath();
                        } else if (expression.startsWith("rootDirectory.")) {
                            Path root = rootLocator.findMandatoryRoot(projectDir);

            Path installationDirectory,
            Path userHomeDirectory,
            Map<String, String> userProperties,
            Map<String, String> systemProperties,
            Path topDirectory,
            Path rootDirectory,
            InputStream in,
            OutputStream out,
            OutputStream err,
            List<CoreExtension> coreExtensions,
            O options) {
        super(
                parserRequest,

            // project present, but we could not determine rootDirectory: extra work needed
            if (context.invokerRequest.rootDirectory().isEmpty()) {
                Path rootDirectory = Utils.findMandatoryRoot(context.invokerRequest.topDirectory());
                request.setMultiModuleProjectDirectory(rootDirectory.toFile());
                request.setRootDirectory(rootDirectory);
            }
        }

<<<pom.baseUri>>> (<deprecated>) | the directory containing the <<<pom.xml>>> file as URI | <<<$\{project.baseUri\}>>> |
*----+------+------+
| <<<project.rootDirectory>>> | the project's root directory (containing a <<<.mvn>>> directory or with the <<<root="true">>> xml attribute) | <<<$\{project.rootDirectory\}>>> |
*----+------+------+
| <<<build.timestamp>>>\

            private void doLoadFullReactor() {
                Path rootDirectory = request.getRootDirectory();
                if (rootDirectory == null) {
                    return;
                }
                List<Path> toLoad = new ArrayList<>();
                Path root = defaultModelBuilder.getModelProcessor().locateExistingPom(rootDirectory);
                toLoad.add(root);
                while (!toLoad.isEmpty()) {

    @Override
    public Path getRootDirectory() {
        if (rootDirectory == null) {
            throw new IllegalStateException(RootLocator.UNABLE_TO_FIND_ROOT_PROJECT_MESSAGE);
        }
        return rootDirectory;
    }

    @Override
    public MavenExecutionRequest setRootDirectory(Path rootDirectory) {
        this.rootDirectory = rootDirectory;
        return this;
    }

    @Override

    }

    @Override
    public Path getRootDirectory() {
        return request.getRootDirectory();
    }

    @Override
    public ModelBuildingRequest setRootDirectory(Path rootDirectory) {
        request.setRootDirectory(rootDirectory);
        return this;
    }

        @Nullable
        public Path rootDirectory;

        public List<CoreExtension> extensions;
        public Options options;

        public Map<String, String> extraInterpolationSource() {
            Map<String, String> extra = new HashMap<>();
            extra.put("session.topDirectory", topDirectory.toString());
            if (rootDirectory != null) {

            Path installationDirectory,
            Path userHomeDirectory,
            Map<String, String> userProperties,
            Map<String, String> systemProperties,
            Path topDirectory,
            Path rootDirectory,
            InputStream in,
            OutputStream out,
            OutputStream err,
            List<CoreExtension> coreExtensions,
            Options options) {
        super(
                parserRequest,