req.setSystemProperties(toProperties(session.getSystemProperties()));
            if (request.getGlobalSettingsSource().isPresent()) {
                req.setGlobalSettingsSource(new MappedSettingsSource(
                        request.getGlobalSettingsSource().get()));
            }
            if (request.getGlobalSettingsPath().isPresent()) {

    Session getSession();

    /**
     * Gets the global settings source.
     *
     * @return the global settings source or {@code null} if none
     */
    @Nonnull
    Optional<Source> getGlobalSettingsSource();

    /**
     * Gets the project settings source.
     *
     * @return the project settings source or {@code null} if none
     */
    @Nonnull
    Optional<Source> getProjectSettingsSource();

    @Override
    public SettingsBuilderResult build(SettingsBuilderRequest request) throws SettingsBuilderException {
        List<BuilderProblem> problems = new ArrayList<>();

        Source globalSource = request.getGlobalSettingsSource().orElse(null);
        Settings global = readSettings(globalSource, false, request, problems);

        Source projectSource = request.getProjectSettingsSource().orElse(null);