InternalSession.associate(repoSession, iSession);

            List<RemoteRepository> repositories = RepositoryUtils.toRepos(request.getPluginArtifactRepositories());
            UnaryOperator<String> interpolator = createInterpolator(request);

            return resolveCoreExtensions(repoSession, repositories, providedArtifacts, extensions, interpolator);
        }

            InternalSession.associate(repoSession, iSession);

            List<RemoteRepository> repositories = RepositoryUtils.toRepos(request.getPluginArtifactRepositories());
            UnaryOperator<String> interpolator = createInterpolator(request);

            return resolveCoreExtensions(repoSession, repositories, providedArtifacts, extensions, interpolator);
        }

        assertNotNull(project.getRemoteArtifactRepositories());
        assertTrue(project.getRemoteArtifactRepositories().isEmpty());

        assertNotNull(project.getPluginArtifactRepositories());
        assertTrue(project.getPluginArtifactRepositories().isEmpty());

        assertNull(project.getParent());
        assertNull(project.getParentArtifact());

        this.remotePluginRepositories = RepositoryUtils.toRepos(getPluginArtifactRepositories());
    }

    /**
     * @return a list of ArtifactRepository objects constructed from the Repository objects returned by
     *         getPluginRepositories.
     */
    @Deprecated
    public List<ArtifactRepository> getPluginArtifactRepositories() {
        if (pluginArtifactRepositories == null) {

    List<ArtifactRepository> getRemoteRepositories();

    MavenExecutionRequest setPluginArtifactRepositories(List<ArtifactRepository> repositories);

    List<ArtifactRepository> getPluginArtifactRepositories();

    MavenExecutionRequest setRepositoryCache(RepositoryCache repositoryCache);

    RepositoryCache getRepositoryCache();

    WorkspaceReader getWorkspaceReader();

        List<ArtifactRepository> remoteRepositories = projectBuildingRequest.getRemoteRepositories();
        List<ArtifactRepository> pluginRepositories = projectBuildingRequest.getPluginArtifactRepositories();
        try {
            pluginRepositories = projectBuildingHelper.createArtifactRepositories(
                    model3.getPluginRepositories(), pluginRepositories, projectBuildingRequest);