return this;
    }

    @Override
    public Path getRootDirectory() {
        return rootDirectory;
    }

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

    @Test
    void testRootDirectory() throws Exception {
        Path rootDirectory = Paths.get("myRootDirectory");

        Model model = Model.newBuilder()
                .version("3.8.1")
                .artifactId("foo")
                .repositories(Collections.singletonList(Repository.newBuilder()
                        .url("file:${project.rootDirectory}/temp-repo")
                        .build()))
                .build();

        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);

            // 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>>>\

    @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

        @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) {

        request.setTopDirectory(context.invokerRequest.topDirectory());
        if (context.invokerRequest.rootDirectory().isPresent()) {
            request.setMultiModuleProjectDirectory(
                    context.invokerRequest.rootDirectory().get().toFile());
            request.setRootDirectory(context.invokerRequest.rootDirectory().get());
        }

        request.addPluginGroup("org.apache.maven.plugins");

        if (cliRequest.getRootDirectory() != null) {
            props = new Properties();
            props.putAll(cliRequest.getUserProperties());
            props.put("session.rootDirectory", cliRequest.getRootDirectory().toString());
        }
        settingsRequest.setUserProperties(props);

        if (request.getEventSpyDispatcher() != null) {