}

            MavenExecutionRequest req = session.getRequest();
            if (req != null) {
                request.setRemoteRepositories(req.getRemoteRepositories());
            }
        } else {
            Properties props = new Properties();
            EnvironmentUtils.addEnvVars(props);
            props.putAll(System.getProperties());

        }

        @Override
        public List<ArtifactVersion> retrieveAvailableVersions(MetadataResolutionRequest request)
                throws ArtifactMetadataRetrievalException {
            return retrieveAvailableVersions(
                    request.getArtifact(), request.getLocalRepository(), request.getRemoteRepositories());
        }
    }

            throws RepositoryMetadataResolutionException {
        ArtifactRepository localRepo = request.getLocalRepository();
        List<ArtifactRepository> remoteRepositories = request.getRemoteRepositories();

        if (!request.isOffline()) {
            Date localCopyLastModified = null;
            if (metadata.getBaseVersion() != null) {