session.setParallel(parallel);

            ProjectDependencyGraph dependencyGraph = session.getProjectDependencyGraph();
            MavenProject rootProject = session.getTopLevelProject();

            Map<MavenProject, List<MavenProject>> allProjects = new LinkedHashMap<>();
            dependencyGraph
                    .getSortedProjects()

            } else if (!failedProjects.isEmpty()) {
                List<MavenProject> sortedProjects = result.getTopologicallySortedProjects();

                // Sort the failedProjects list in the topologically sorted order.
                failedProjects.sort(comparing(sortedProjects::indexOf));

                MavenProject firstFailedProject = failedProjects.get(0);