public Properties getUserProperties() {
        if (userProperties == null) {
            userProperties = new Properties();
        }

        return userProperties;
    }

    @Override
    public DefaultSettingsBuildingRequest setUserProperties(Properties userProperties) {
        if (userProperties != null) {
            this.userProperties = new Properties();

     */
    @SuppressWarnings("unchecked")
    public DefaultProfileActivationContext setUserProperties(Properties userProperties) {
        if (userProperties != null) {
            this.userProperties = Collections.unmodifiableMap((Map) userProperties);
        } else {
            this.userProperties = Collections.emptyMap();
        }

        return this;
    }

    /**

     * @return The user properties with contributions.
     */
    default Map<String, String> contribute(ProtoSession protoSession) {
        HashMap<String, String> userProperties = new HashMap<>(protoSession.getUserProperties());
        contribute(userProperties);
        return userProperties;
    }

    public Properties getUserProperties() {
        return userProperties;
    }

    @Override
    public ProjectBuildingRequest setUserProperties(Properties userProperties) {
        if (userProperties != null) {
            this.userProperties = new Properties();
            this.userProperties.putAll(userProperties);
        } else {
            this.userProperties.clear();
        }

        return this;
    }

    public Properties getUserProperties() {
        return request.getUserProperties();
    }

    @Override
    public FilterModelBuildingRequest setUserProperties(Properties userProperties) {
        request.setUserProperties(userProperties);

        return this;
    }

    @Override
    public Date getBuildStartTime() {
        return request.getBuildStartTime();
    }

    @Override

            MavenPropertiesLoader.loadProperties(userProperties, propertiesFile, callback, false);
        } catch (IOException e) {
            throw new IllegalStateException("Error loading properties from " + propertiesFile, e);
        }

        // CLI specified properties are most dominant
        userProperties.putAll(userSpecifiedProperties);

        return toMap(userProperties);
    }

    ProjectBuilderConfiguration setLocalRepository(ArtifactRepository localRepository);

    ProjectBuilderConfiguration setUserProperties(Properties userProperties);

    ProjectBuilderConfiguration setExecutionProperties(Properties executionProperties);

    Date getBuildStartTime();

    ProjectBuilderConfiguration setBuildStartTime(Date buildStartTime);

    protected LayeredOptions(List<O> options) {
        this.options = new ArrayList<>(options);
    }

    @Override
    public Optional<Map<String, String>> userProperties() {
        return collectMapIfPresentOrEmpty(Options::userProperties);
    }

    @Override
    public String source() {
        return String.format(
                "layered(%s)", options.stream().map(Options::source).toList());
    }

        data.put("plexus", container);
        data.put("workingDirectory", cliRequest.workingDirectory);
        data.put("systemProperties", cliRequest.systemProperties);
        data.put("userProperties", cliRequest.userProperties);
        data.put("versionProperties", CLIReportingUtils.getBuildProperties());
        eventSpyDispatcher.init(eventSpyContext);

        // refresh logger in case container got customized by spy

     * on his discretion, e.g. via the {@code -Dkey=value} parameter on the command line.
     *
     * @param userProperties The user properties, may be {@code null}.
     * @return This request, never {@code null}.
     */
    SettingsBuildingRequest setUserProperties(Properties userProperties);