in src/main/java/org/apache/maven/resolver/internal/ant/AntRepoSys.java [158:173]
private void initDefaults() {
RemoteRepository repo = new RemoteRepository();
repo.setProject(project);
repo.setId("central");
repo.setUrl("https://repo1.maven.org/maven2/");
project.addReference(Names.ID_CENTRAL, repo);
repo = new RemoteRepository();
repo.setProject(project);
repo.setRefid(new Reference(project, Names.ID_CENTRAL));
RemoteRepositories repos = new RemoteRepositories();
repos.setProject(project);
repos.addRemoterepo(repo);
project.addReference(Names.ID_DEFAULT_REPOS, repos);
}