return this;
    }

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

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

        return this;
    }

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

    public BuildSummary getBuildSummary(MavenProject project) {

    // 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.
     *

        if (result.hasExceptions()) {
            throw new ArtifactResolutionException(
                    "Unknown error during artifact resolution, " + request + ", " + result.getExceptions(),
                    request.getArtifact(),
                    request.getRemoteRepositories());
        }
    }

    private static <T> List<T> toList(Collection<T> items) {

            validateOptionalProfiles(session, request.getProfileActivation());

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

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

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

    /**
     * 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();

    /**

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

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

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

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

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

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

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

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

                    result.setVersion(subResult.getVersion());
                    result.setRepository(subResult.getRepository());
                    for (Exception exception : subResult.getExceptions()) {
                        result.addException(exception);
                    }
                }
            } else {

            if ((i == lines.length - 1)
                    && (context.invokerRequest.options().showErrors().orElse(false)
                            || (summary.getException() instanceof InternalErrorException))) {
                context.logger.error(line, summary.getException());
            } else {
                context.logger.error(line);
            }

            currentColor = nextColor;
        }