throws MavenExecutionException {
        List<MavenProject> result = projects;

        ProjectActivation projectActivation = request.getProjectActivation();

        Set<String> requiredSelectors = projectActivation.getRequiredActiveProjectSelectors();
        Set<String> optionalSelectors = projectActivation.getOptionalActiveProjectSelectors();
        if (!requiredSelectors.isEmpty() || !optionalSelectors.isEmpty()) {

    private List<Proxy> proxies;

    private List<Server> servers;

    private List<Mirror> mirrors;

    private List<Profile> profiles;

    private final ProjectActivation projectActivation = new ProjectActivation();
    private final ProfileActivation profileActivation = new ProfileActivation();

    private List<String> pluginGroups;

    private boolean isProjectPresent = true;

        final Options options = new Options();
        options.addOption(Option.builder(CLIManager.PROJECT_LIST).hasArg().build());

        ProjectActivation activation;

        activation = new ProjectActivation();
        performProjectActivation(
                parser.parse(options, new String[] {"-pl", "test1,+test2,?test3,+?test4"}), activation);

            boolean parameterRecursive) {
        // Given
        ProjectActivation projectActivation = new ProjectActivation();
        parameterActiveRequiredProjects.forEach(projectActivation::activateRequiredProject);
        parameterActiveOptionalProjects.forEach(projectActivation::activateOptionalProject);
        parameterInactiveRequiredProjects.forEach(projectActivation::deactivateRequiredProject);

        final ProjectActivation projectActivation = request.getProjectActivation();
        final Set<String> allOptionalSelectors = new HashSet<>();
        allOptionalSelectors.addAll(projectActivation.getOptionalActiveProjectSelectors());
        allOptionalSelectors.addAll(projectActivation.getRequiredActiveProjectSelectors());

            return MavenExecutionRequest.REACTOR_MAKE_BOTH;
        } else {
            return null;
        }
    }

    protected void performProjectActivation(MavenContext context, ProjectActivation projectActivation) {
        if (context.options().projects().isPresent()
                && !context.options().projects().get().isEmpty()) {
            List<String> optionValues = context.options().projects().get();

    /**
     * Return the requested activation(s) of project(s) in this execution.
     * @return requested (de-)activation(s) of project(s) in this execution. Never {@code null}.
     */
    ProjectActivation getProjectActivation();

    /**
     * Return the requested activation(s) of profile(s) in this execution.
     * @return requested (de-)activation(s) of profile(s) in this execution. Never {@code null}.
     */