if (configuration instanceof PlexusConfiguration) {
            plexusConfig = (PlexusConfiguration) configuration;
        } else if (configuration instanceof Xpp3Dom) {
            plexusConfig = new XmlPlexusConfiguration((Xpp3Dom) configuration);
        } else {
            throw new BeanConfigurationException("unsupported bean configuration source ("
                    + configuration.getClass().getName() + ")");