From M1LayoutedM2ShadowRepositoryTest

            M1LayoutedM2ShadowRepository shadow = (M1LayoutedM2ShadowRepository) getContainer().lookup(
                ShadowRepository.class,
                "m2-m1-shadow" );

            CRepository repoConf = new DefaultCRepository();

            repoConf.setProviderRole( ShadowRepository.class.getName() );
            repoConf.setProviderHint( "m2-m1-shadow" );
            repoConf.setId( master.getId() + "-m1" );

            repoConf.setLocalStorage( new CLocalStorage() );
            repoConf.getLocalStorage().setProvider( "file" );

            Xpp3Dom exRepo = new Xpp3Dom( "externalConfiguration" );
            repoConf.setExternalConfiguration( exRepo );
            M1LayoutedM2ShadowRepositoryConfiguration exRepoConf = new M1LayoutedM2ShadowRepositoryConfiguration(
                exRepo );
            exRepoConf.setMasterRepositoryId( master.getId() );
            exRepoConf.applyChanges();

            shadow.configure( repoConf );

            shadow.synchronizeWithMaster();

            getRepositoryRegistry().addRepository( shadow );