session.getRepositorySystem().collectDependencies(systemSession, collectRequest);
            return new DefaultDependencyResolverResult(
                    null, result.getExceptions(), session.getNode(result.getRoot(), request.getVerbose()), 0);
        } catch (DependencyCollectionException e) {
            throw new DependencyResolverException("Unable to collect dependencies", e);
        }
    }

    @Override

                    return Optional.ofNullable(res.getDependencyResolutionResult())
                            .map(r -> new DefaultDependencyResolverResult(
                                    null, r.getCollectionErrors(), session.getNode(r.getDependencyGraph()), 0));
                }
            };
        } catch (ProjectBuildingException e) {
            throw new ProjectBuilderException("Unable to build project", e);
        }
    }