/**
     * Gets the exceptions that occurred while building the dependency graph.
     *
     * @return the exceptions that occurred, never {@code null}
     */
    @Nonnull
    List<Exception> getExceptions();

    /**
     * Gets the root node of the dependency graph.
     *
     * @return the root node of the dependency graph or {@code null} if none
     */
    @Nullable
    Node getRoot();

            validateOptionalProfiles(session, request.getProfileActivation());

            if (session.getResult().hasExceptions()) {
                addExceptionToResult(result, session.getResult().getExceptions().get(0));
                persistResumptionData(result, session);
                return result;
            } else {
                session.getAllProjects().stream()

        request.setGoals(Arrays.asList("validate"));
        MavenExecutionResult result = maven.execute(request);

        assertFalse(result.hasExceptions(), result.getExceptions().toString());

        MavenProject project = result.getProject();

        assertEquals("bar", project.getProperties().getProperty("foo"));

            result.setDependencyGraph(node);
        } catch (DependencyCollectionException e) {
            result.setDependencyGraph(e.getResult().getRoot());
            result.setCollectionErrors(e.getResult().getExceptions());

            throw new DependencyResolutionException(
                    result, "Could not resolve dependencies for project " + project.getId() + ": " + e.getMessage(), e);
        }

                createMavenExecutionRequest(getProject("cyclic-reference")).setGoals(asList("validate"));

        MavenExecutionResult result = maven.execute(request);

        assertEquals(ProjectCycleException.class, result.getExceptions().get(0).getClass());
    }

    @Test
    void testMavenProjectNoDuplicateArtifacts() throws Exception {
        MavenProjectHelper mavenProjectHelper = getContainer().lookup(MavenProjectHelper.class);

import org.apache.maven.api.annotations.Nonnull;

/**
 *
 * @since 4.0.0
 */
@Experimental
public interface VersionRangeResolverResult {

    @Nonnull
    List<Exception> getExceptions();

    @Nonnull
    List<Version> getVersions();

    @Nonnull
    default Optional<Version> getLowerVersion() {
        return getVersions().isEmpty()
                ? Optional.empty()

    // for each exception
    // - knowing what artifacts are missing
    // - 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.
     *

        Map<Artifact, Path> artifacts = session.resolveArtifacts(coordinates);
        DefaultDependencyResolverResult result = new DefaultDependencyResolverResult(
                collectorResult.getExceptions(), collectorResult.getRoot(), nodes.size());
        for (Node node : nodes) {
            Dependency d = node.getDependency();
            Path path = (d != null) ? artifacts.get(d) : null;
            try {

    // ------------------------------------------------------------------------

    public boolean hasExceptions() {
        return exceptions != null && !exceptions.isEmpty();
    }

    public List<Exception> getExceptions() {
        return exceptions == null ? Collections.emptyList() : Collections.unmodifiableList(exceptions);
    }

    // ------------------------------------------------------------------------

                System.err.println("Missing: " + artifact);
            }
        }

        if (result.hasExceptions()) {
            for (Exception e : result.getExceptions()) {
                e.printStackTrace();
            }
        }
    }