final MavenSession ms = nonNull(getMavenSession());
        final MavenSession mss;
        if (repoSession != ms.getRepositorySession()) {
            mss = new MavenSession(repoSession, ms.getRequest(), ms.getResult());
        } else {
            mss = ms;
        }
        return newSession(mss, repositories);
    }

    protected Session newSession(MavenSession mavenSession, List<RemoteRepository> repositories) {

                    try {
                        result = modelBuilder.build(request);
                    } catch (ModelBuilderException e) {
                        result = e.getResult();
                        if (result == null || result.getEffectiveModel() == null) {
                            throw new ProjectBuildingException(

                        .build();

                model = modelBuilder.build(modelRequest).getEffectiveModel();
            } catch (ModelBuilderException e) {
                for (ModelProblem problem : e.getResult().getProblems()) {
                    if (problem.getException() instanceof ModelResolverException) {
                        result.addException(problem.getException());

                        .twoPhaseBuilding(false)
                        .build();
                importResult = build(importRequest, importIds);
            } catch (ModelBuilderException e) {
                e.getResult().getProblems().forEach(problems::add);
                return null;
            }

            importResult.getProblems().forEach(problems::add);

            importModel = importResult.getEffectiveModel();