String messages = r.getProblems().stream()
                    .map(ModelProblem::getMessage)
                    .map(m -> "\"" + m + "\"" + System.lineSeparator())
                    .collect(joining(", "));
            description.appendText(messages);
        }
    }

    static Matcher<ProjectBuildingResult> projectBuildingResultWithProblemMessage(String message) {

        return visitor.leave(this);
    }

    @Override
    public Node filter(Predicate<Node> filter) {
        List<Node> children =
                getChildren().stream().filter(filter).map(n -> n.filter(filter)).collect(Collectors.toList());
        return new WrapperNode(this, Collections.unmodifiableList(children));
    }

    @Override
    public String asString() {
        StringBuilder sb = new StringBuilder();

                        || result.getBuildSummary(project) instanceof BuildFailure)
                .map(project -> project.getGroupId() + ":" + project.getArtifactId())
                .collect(Collectors.toList());

        if (remainingProjects.isEmpty()) {
            LOGGER.info("No remaining projects found, resuming the build would not make sense.");
            return Optional.empty();
        }

                        d.getGroupId() + ":" + d.getArtifactId()))
                .map(Artifact::getVersion)
                .filter(v -> v.startsWith("2."))
                .collect(Collectors.toSet());

        if (!maven2Versions.isEmpty()) {
            pluginValidationManager.reportPluginValidationIssue(
                    PluginValidationManager.IssueLocality.EXTERNAL,
                    session,

        this.artifactTransformations = Stream.of("release", "latest", "snapshot")
                .map(artifactTransformations::get)
                .filter(Objects::nonNull)
                .collect(Collectors.toList());
    }

    public void transformForResolve(Artifact artifact, RepositoryRequest request)
            throws ArtifactResolutionException, ArtifactNotFoundException {

        this.artifacts = Collections.unmodifiableSet(new HashSet<>(exportedArtifacts));
        this.packages = exportedPackages.stream()
                .collect(collectingAndThen(toMap(identity(), v -> realm), Collections::unmodifiableMap));
    }

    /**
     * Returns artifacts exported by Maven core and core extensions. Artifacts are identified by their

                .filter(a -> a.getVersion().startsWith("3."))
                .map(a -> a.getGroupId() + ":" + a.getArtifactId() + ":" + a.getVersion())
                .collect(Collectors.toSet());

        if (!mavenArtifacts.isEmpty()) {
            pluginValidationManager.reportPluginValidationIssue(
                    PluginValidationManager.IssueLocality.EXTERNAL,
                    session,

     * @return the result of the resolution
     * @throws DependencyCollectorException
     * @throws DependencyResolverException
     * @throws ArtifactResolverException
     *
     * @see DependencyCollector#collect(DependencyCollectorRequest)
     * @see #flatten(Session, Node, PathScope)
     * @see ArtifactResolver#resolve(ArtifactResolverRequest)
     */
    DependencyResolverResult resolve(DependencyResolverRequest request)

    public ExclusionArtifactFilter(List<Exclusion> exclusions) {
        this.exclusions = exclusions;
        this.predicates =
                exclusions.stream().map(ExclusionArtifactFilter::toPredicate).collect(Collectors.toList());
    }

    @Override
    public boolean include(Artifact artifact) {
        return predicates.stream().noneMatch(p -> p.test(artifact));
    }

                        && !rootProject.getDefaultGoal().isEmpty())) {
            tasks = Stream.of(rootProject.getDefaultGoal().split("\\s+"))
                    .filter(g -> !g.isEmpty())
                    .collect(Collectors.toList());
        }

        return calculateTaskSegments(session, tasks);
    }

    @Override
    public List<TaskSegment> calculateTaskSegments(MavenSession session, List<String> tasks)