org.apache.commons.logging.Log { private static final String FQCN; private org.apache.log4j.Category category; public void Log4JCategoryLog(); public void Log4JCategoryLog(String); public void Log4JCategoryLog(org.apache.log4j.Category); public void trace(Object); public void trace(Object, Throwable); public void debug(Object); public void debug(Object, Throwable); public void info(Object); public void info(Object, Throwable); public void warn(Object); public void warn(Object, Throwable); public void error(Object);...

     */
    public List<String> getDependencyTrail() throws OverConstrainedVersionException {
        List<Artifact> trial = getTrail();

        List<String> ret = new ArrayList<>(trial.size());

        for (Artifact artifact : trial) {
            ret.add(artifact.getId());
        }

        return ret;
    }

  </description>

  <build>
    <plugins>
      <!-- NOTE: It's essential part of this test variant to redefine the test plugin again, i.e. trigger plugin merging -->
      <plugin>
        <groupId>org.apache.maven.its.plugins</groupId>
        <artifactId>maven-it-plugin-log-file</artifactId>
        <version>2.1-SNAPSHOT</version>
      </plugin>
    </plugins>

import java.io.FileNotFoundException;
import java.net.URISyntaxException;
import java.net.URL;
import java.util.Arrays;

import org.apache.maven.artifact.repository.ArtifactRepository;
import org.apache.maven.bridge.MavenRepositorySystem;
import org.apache.maven.execution.DefaultMavenExecutionRequest;
import org.apache.maven.execution.DefaultMavenExecutionResult;
import org.apache.maven.execution.MavenSession;

        return result;
    }

    private void missingDescriptor(
            RepositorySystemSession session, RequestTrace trace, Artifact artifact, Exception exception) {
        RepositoryEvent.Builder event = new RepositoryEvent.Builder(session, EventType.ARTIFACT_DESCRIPTOR_MISSING);
        event.setTrace(trace);
        event.setArtifact(artifact);
        event.setException(exception);

import java.nio.file.Files;

import org.apache.maven.MavenTestHelper;
import org.apache.maven.api.settings.InputSource;
import org.apache.maven.artifact.repository.layout.DefaultRepositoryLayout;
import org.apache.maven.bridge.MavenRepositorySystem;
import org.apache.maven.model.Profile;
import org.apache.maven.project.DefaultProjectBuilder;
import org.apache.maven.project.DefaultProjectBuildingRequest;

        requests.add(new MetadataRequest(metadata, null, REPOSITORY_CONTEXT).setTrace(trace));

        for (RemoteRepository repository : request.getRepositories()) {
            requests.add(new MetadataRequest(metadata, repository, REPOSITORY_CONTEXT).setTrace(trace));
        }

        List<MetadataResult> results = repositorySystem.resolveMetadata(request.getRepositorySession(), requests);

import org.apache.maven.artifact.repository.layout.ArtifactRepositoryLayout;
import org.apache.maven.artifact.resolver.ArtifactResolutionRequest;
import org.apache.maven.artifact.resolver.ArtifactResolutionResult;
import org.apache.maven.bridge.MavenRepositorySystem;
import org.apache.maven.model.Dependency;
import org.apache.maven.model.Plugin;
import org.apache.maven.model.Repository;
import org.apache.maven.settings.Mirror;

import java.util.Properties;

import org.apache.maven.artifact.Artifact;
import org.apache.maven.artifact.InvalidRepositoryException;
import org.apache.maven.artifact.repository.ArtifactRepository;
import org.apache.maven.bridge.MavenRepositorySystem;
import org.apache.maven.execution.DefaultMavenExecutionRequest;
import org.apache.maven.execution.DefaultMavenExecutionResult;
import org.apache.maven.execution.MavenExecutionRequest;

            }
        }

        DependencyRequest depRequest = new DependencyRequest(collect, filter);
        depRequest.setTrace(trace);

        DependencyNode node;
        try {
            collect.setTrace(RequestTrace.newChild(trace, depRequest));
            node = repoSystem.collectDependencies(session, collect).getRoot();
            result.setDependencyGraph(node);