Fetching Maven artifacts programmatically [closed]

Answer 1

    public List findDependencies(Artifact artifact) throws DependencyCollectionException {

    CollectRequest collectRequest = new CollectRequest();
    collectRequest.setRoot( new Dependency(artifact, "" ) );
    collectRequest.addRepository(repository);

    final MavenServiceLocator locator = new MavenServiceLocator();
    locator.addService( RepositoryConnectorFactory.class, FileRepositoryConnectorFactory.class );
    locator.addService( RepositoryConnectorFactory.class, WagonRepositoryConnectorFactory.class );
    locator.setServices( WagonProvider.class, new WagonProvider() {
        public Wagon lookup(String roleHint) throws Exception {
            if (Arrays.asList("http", "https").contains(roleHint)) {
                return new LightweightHttpWagon();
            }
            return null;
        }

        public void release(Wagon wagon) {

        }
    });

    final RepositorySystem system = locator.getService(RepositorySystem.class);
    MavenRepositorySystemSession session = new MavenRepositorySystemSession();

    session.setLocalRepositoryManager( system.newLocalRepositoryManager(localRepository) );
    session.setTransferListener( new LoggingTransferListener() );
    session.setRepositoryListener( new LoggingRepositoryListener() );

    final List artifacts = new ArrayList();

    system.collectDependencies(session, collectRequest).getRoot().accept( new DependencyVisitor() {
        public boolean visitEnter(DependencyNode dependencyNode) {
            artifacts.add(dependencyNode.getDependency().getArtifact());
            return true;
        }

        public boolean visitLeave(DependencyNode dependencyNode) {
            return true;
        }
    });
    return artifacts;
}