try {
            versionConstraint =
                    versionScheme.parseVersionConstraint(request.getArtifact().getVersion());
        } catch (InvalidVersionSpecificationException e) {
            result.addException(e);
            throw new VersionRangeResolutionException(result);
        }

        result.setVersionConstraint(versionConstraint);

        if (versionConstraint.getRange() == null) {

                pomArtifact = pomArtifact.setVersion(versionResult.getVersion());
            } catch (VersionResolutionException e) {
                result.addException(e);
                throw new ArtifactDescriptorException(result);
            }

            if (!visited.add(a.getGroupId() + ':' + a.getArtifactId() + ':' + a.getBaseVersion())) {

            Map<String, VersionInfo> infos = new HashMap<>();

            for (MetadataResult metadataResult : metadataResults) {
                result.addException(metadataResult.getException());

                ArtifactRepository repository = metadataResult.getRequest().getRepository();
                if (repository == null) {

                }
            } catch (InterruptedException e) {
                rootSession.getResult().addException(e);
                break;
            } catch (ExecutionException e) {
                // TODO MNG-5766 changes likely made this redundant
                rootSession.getResult().addException(e);
                break;
            }
        }
    }

        return this;
    }

    public List<Throwable> getExceptions() {
        return exceptions;
    }

    public MavenExecutionResult addException(Throwable t) {
        exceptions.add(t);

        return this;
    }

    public boolean hasExceptions() {
        return !getExceptions().isEmpty();
    }

            }
            builder.build(session, reactorContext, projectBuilds, taskSegments, reactorBuildStatus);

        } catch (Exception e) {
            result.addException(e);
        } finally {
            eventCatapult.fire(ExecutionEvent.Type.SessionEnded, session, null);
        }
    }

    private boolean buildExecutionRequiresProject(MavenSession session) {

        MavenProject project = createMavenProject(artifactId);
        executionResult.addBuildSummary(new BuildFailure(project, 0, new Exception()));
        executionResult.addException(new LifecycleExecutionException("", project));
        return project;
    }

                } catch (FileNotFoundException | URISyntaxException e) {
                    throw new IllegalStateException("Missing test POM for " + artifact, e);
                }
            } else {
                result.addException(new ArtifactNotFoundException(artifact, (RemoteRepository) null));
                throw new ArtifactResolutionException(results);
            }
        }

        return results;
    }

    // - project building exception
    // - invalid project model exception: list of markers
    // - xmlpull parser exception
    List<Throwable> getExceptions();

    MavenExecutionResult addException(Throwable e);

    boolean hasExceptions();

    /**
     * Gets the build summary for the specified project.
     *
     * @param project The project to get the build summary for, must not be {@code null}.

            Throwable t,
            final long buildStartTime) {
        // record the error and mark the project as failed
        long buildEndTime = System.currentTimeMillis();
        buildContext.getResult().addException(t);
        buildContext.getResult().addBuildSummary(new BuildFailure(mavenProject, buildEndTime - buildStartTime, t));

        // notify listeners about "soft" project build failures only