How to get access to Maven's dependency hierarchy within a plugin

Question

In my plugin I need to process the dependency hierarchy and get information (groupId, artifactId, version etc) about each dependency and if it was excluded. What is the best

Answer 1

For Maven 3 you can use DependencyGraphBuilder. It does pretty much the same thing as DependencyTreeBuilder.

Here is the example

    import org.apache.maven.artifact.resolver.filter.ArtifactFilter;
    import org.apache.maven.artifact.resolver.filter.IncludesArtifactFilter;
    import org.apache.maven.execution.MavenSession;
    import org.apache.maven.model.Dependency;
    import org.apache.maven.plugins.annotations.ResolutionScope;
    import org.apache.maven.plugins.annotations.LifecyclePhase;
    import org.apache.maven.shared.dependency.graph.DependencyGraphBuilder;

    import org.apache.maven.shared.dependency.graph.DependencyNode;
    import org.apache.maven.shared.dependency.graph.traversal.CollectingDependencyNodeVisitor;

    public class AnanlyzeTransitiveDependencyMojo extends AbstractMojo{

        @Parameter(defaultValue = "${project}", readonly = true, required = true)
        private MavenProject project;

        @Parameter(defaultValue = "${session}", readonly = true, required = true)
        private MavenSession session;

        @Component(hint="maven3")
        private DependencyGraphBuilder dependencyGraphBuilder;

        @Override
        public void execute() throws MojoExecutionException, MojoFailureException {
    // If you want to filter out certain dependencies.
             ArtifactFilter artifactFilter = new IncludesArtifactFilter("groupId:artifactId:version");
             ProjectBuildingRequest buildingRequest = new DefaultProjectBuildingRequest(session.getProjectBuildingRequest());
             buildingRequest.setProject(project);
            try{
               DependencyNode depenGraphRootNode = dependencyGraphBuilder.buildDependencyGraph(buildingRequest, artifactFilter);
               CollectingDependencyNodeVisitor visitor = new  CollectingDependencyNodeVisitor();
               depenGraphRootNode.accept(visitor);
               List children = visitor.getNodes();

               getLog().info("CHILDREN ARE :");
               for(DependencyNode node : children) {
                   Artifact atf = node.getArtifact();
            }
}catch(Exception e) {
    e.printStackTrace();
}