Java Code to get Maven Dependency Graph

Question

One of the requirements for a program I am working on is that I need to be able to look through the Maven dependencies of several artifacts in a repository so I can create dependency graphs for them. While it is obvious that Maven and Eclipse Aether can do this (as a huge part of Maven is getting dependencies), I'm having a really tough time figuring out how to do it in a Java program.

Any suggestions?

Answer 1

It seems that Aether can help, according to the documentation . There is even an example that demonstrates how to use Aether to collect the transitive dependencies of an artifact . Combining that with the Maven API example here , I think you can get where you want.

Answer 2

有几种方法可以做到这一点，或者使用像Eclipse这样的IDE……或者您可以使用仅打印到控制台中的maven-dependency-plugin来实现。

mvn dependency:tree

Answer 3

After looking around at various different examples and code, I cobbled together this, which seems to work:

public List<Artifact> fetchArtifactDependencies(final RepositorySystemSession session,
                                                final Artifact artifact,
                                                final DependencyFilter dependencyFilter)
        throws RepositoryException {

    final CollectRequest collectRequest = new CollectRequest();
    collectRequest.setRoot(new Dependency(artifact, "compile"));
    collectRequest.addRepository([repository]);

    final DependencyNode node = repositorySystem.collectDependencies(session, collectRequest)
                                                .getRoot();

    final DependencyRequest dependencyRequest = new DependencyRequest();
    dependencyRequest.setRoot(node);
    dependencyRequest.setFilter(dependencyFilter);

    final DependencyResult dependencyResult = repositorySystem.resolveDependencies(session,
                                                                                   dependencyRequest);

    final List<ArtifactResult> artifactResults = dependencyResult.getArtifactResults();

    final List<Artifact> results = new ArrayList<>(artifactResults.size());

    CollectionUtils.collect(artifactResults, new Transformer<ArtifactResult, Artifact>() {
        @Override
        public Artifact transform(final ArtifactResult input) {
            return input.getArtifact();
        }
    }, results);

    return results;
}