String revision = request.getUserProperties().getProperty("revision");
        assertEquals("8.2.0", revision);

        assertEquals("bar ", request.getUserProperties().getProperty("foo"));
        assertEquals("bar two", request.getUserProperties().getProperty("foo2"));
        assertEquals("Apache Maven", request.getUserProperties().getProperty("label"));

        // single one
        request.getUserProperties().put("maven.session.versionFilter", "s");
        versionFilter = systemSessionFactory.newRepositorySession(request).getVersionFilter();
        assertNotNull(versionFilter);
        assertInstanceOf(ContextualSnapshotVersionFilter.class, versionFilter);

        request.getUserProperties().put("maven.session.versionFilter", "h");

     */
    @Nonnull
    Map<String, String> getSystemProperties();

    /**
     * Provides a map of user properties.
     * User properties
     */
    @Nonnull
    Map<String, String> getUserProperties();

    @Nonnull
    RepositoryMerging getRepositoryMerging();

    @Nullable
    ModelTransformer getLifecycleBindingsInjector();

    @Nonnull

            request.setRepositorySession(session.getRepositorySession());
            request.setSystemProperties(session.getSystemProperties());
            if (request.getUserProperties().isEmpty()) {
                request.setUserProperties(session.getUserProperties());
            }

            MavenExecutionRequest req = session.getRequest();
            if (req != null) {

     * line.
     *
     * @return The user properties, never {@code null}.
     */
    public Properties getUserProperties() {
        return request.getUserProperties();
    }

    /**
     * Gets the system properties to use for interpolation and profile activation. The system properties are collected

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

        if (protoSession != null
                && protoSession.getUserProperties().containsKey(Constants.MAVEN_BUILDER_MAX_PROBLEMS)) {
            int limit = Integer.parseInt(protoSession.getUserProperties().get(Constants.MAVEN_BUILDER_MAX_PROBLEMS));
            return create(limit, p -> true);
        } else {
            return create(100);
        }

        setActiveProfileIds(request.getActiveProfileIds());
        setInactiveProfileIds(request.getInactiveProfileIds());
        setSystemProperties(request.getSystemProperties());
        setUserProperties(request.getUserProperties());
        setRemoteRepositories(request.getRemoteRepositories());
        setPluginArtifactRepositories(request.getPluginArtifactRepositories());
        setRepositorySession(request.getRepositorySession());

        copy.setRecursive(original.isRecursive());
        copy.setPom(original.getPom());
        copy.setSystemProperties(original.getSystemProperties());
        copy.setUserProperties(original.getUserProperties());
        copy.setShowErrors(original.isShowErrors());
        copy.setActiveProfiles(original.getActiveProfiles());
        copy.setInactiveProfiles(original.getInactiveProfiles());

        finalConfigProperties.putAll(mergedProps);
        finalConfigProperties.putAll(configProps);

        sessionBuilder.setUserProperties(request.getUserProperties());
        sessionBuilder.setSystemProperties(request.getSystemProperties());
        sessionBuilder.setConfigProperties(finalConfigProperties);

        return sessionBuilder;
    }