public Properties getSystemProperties() {
        if (systemProperties == null) {
            systemProperties = new Properties();
        }

        return systemProperties;
    }

    @Override
    public DefaultModelBuildingRequest setSystemProperties(Properties systemProperties) {
        if (systemProperties != null) {
            this.systemProperties = new Properties();

        this.userHomeDirectory = requireNonNull(userHomeDirectory);
        this.userProperties = requireNonNull(userProperties);
        this.systemProperties = requireNonNull(systemProperties);
        this.topDirectory = requireNonNull(topDirectory);
        this.rootDirectory = rootDirectory;

        this.in = in;
        this.out = out;
        this.err = err;

    public Properties getSystemProperties() {
        if (systemProperties == null) {
            systemProperties = new Properties();
        }

        return systemProperties;
    }

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

                or(paths::get, prefix("cli.", userSpecifiedProperties::get), context.systemProperties::get);

        Path mavenConf;
        if (context.systemProperties.get(MAVEN_INSTALLATION_CONF) != null) {
            mavenConf = context.installationDirectory.resolve(context.systemProperties.get(MAVEN_INSTALLATION_CONF));
        } else if (context.systemProperties.get("maven.conf") != null) {

        return setSystemProperties(toMap(systemProperties));
    }

    /**
     * Sets the system properties to use for interpolation and profile activation. The system properties are collected
     * from the runtime environment like {@link System#getProperties()} and environment variables.
     *
     * @param systemProperties The system properties, may be {@code null}.

            Lookup lookup,
            Context context) {
        super(session, repositorySystem, repositories, resolverRepositories, lookup);
        userProperties = context.userProperties;
        systemProperties = context.systemProperties;
    }

    /**
     *
     */
    public static Session create() {
        Map<String, String> properties = new HashMap<>();
        // Env variables prefixed with "env."

        activator = null;
    }

    protected ProfileActivationContext newContext(final Properties userProperties, final Properties systemProperties) {
        DefaultProfileActivationContext context = new DefaultProfileActivationContext();
        return context.setUserProperties(userProperties).setSystemProperties(systemProperties);
    }

    protected void assertActivation(boolean active, Profile profile, ProfileActivationContext context) {

    Path rootDirectory;

    Path topDirectory;

    boolean verbose;

    boolean quiet;

    boolean showErrors = true;

    Properties userProperties = new Properties();

    Properties systemProperties = new Properties();

    MavenExecutionRequest request;

    CliRequest(String[] args, ClassWorld classWorld) {
        this.args = args;
        this.classWorld = classWorld;

        }
        return goals;
    }

    @Override
    public Properties getSystemProperties() {
        if (systemProperties == null) {
            systemProperties = new Properties();
        }

        return systemProperties;
    }

    @Override
    public Properties getUserProperties() {
        if (userProperties == null) {

                or(paths::getProperty, prefix("cli.", commandLine::getOptionValue), systemProperties::getProperty);

        Path mavenConf;
        if (systemProperties.getProperty(MAVEN_INSTALLATION_CONF) != null) {
            mavenConf = fileSystem.getPath(systemProperties.getProperty(MAVEN_INSTALLATION_CONF));
        } else if (systemProperties.getProperty("maven.conf") != null) {