import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import static java.util.Comparator.comparing;

/**
 * Builds the {@link ProjectDependencyGraph inter-dependencies graph} between projects in the reactor.
 */
@Named(GraphBuilder.HINT)
@Singleton
public class DefaultGraphBuilder implements GraphBuilder {
    private static final Logger LOGGER = LoggerFactory.getLogger(DefaultGraphBuilder.class);

        msgs.add("* An aggregator Mojo is already executing in parallel build,    *");
        msgs.add("* but aggregator Mojos require exclusive access to reactor to   *");
        msgs.add("* prevent race conditions. This mojo execution will be blocked  *");
        msgs.add("* until the aggregator work is done.                            *");

import org.apache.maven.artifact.repository.layout.ArtifactRepositoryLayout;
import org.apache.maven.repository.Proxy;

/**
 * Abstraction of an artifact repository. Artifact repositories can be remote, local, or even build reactor or
 * IDE workspace.
 *
 * @deprecated Avoid use of this type, if you need access to local repository use repository system classes instead.
 */
@Deprecated
public interface ArtifactRepository {

<project>
  <modelVersion>4.0.0</modelVersion>

  <parent>
    <groupId>lifecycle-participant-reactor-dependency-injection</groupId>
    <artifactId>parent</artifactId>
    <version>1.0</version>
  </parent>

  <artifactId>module-b</artifactId>

 */
package org.apache.maven.project;

import java.io.File;
import java.util.HashMap;
import java.util.Map;

/**
 * Holds all POM files that are known to the reactor. This allows the project builder to resolve imported POMs from the
 * reactor when building another project's effective model.
 */
class ReactorModelPool {

    private final Map<CacheKey, File> pomFiles = new HashMap<>();

<project>
  <modelVersion>4.0.0</modelVersion>

  <groupId>lifecycle-participant-reactor-dependency-injection</groupId>
  <artifactId>parent</artifactId>
  <version>1.0</version>
  <packaging>pom</packaging>

  <modules>
    <module>module-a</module>
    <module>module-b</module>
  </modules>

                        .expectResult(MavenExecutionException.class, "empty reactor"),
                scenario("Excluded aggregator, but selected child")
                        .activeRequiredProjects(MODULE_C_1)
                        .inactiveRequiredProjects(MODULE_C)
                        .expectResult(MavenExecutionException.class, "empty reactor"),

            // Verify correct behavior for reactor parent:
            // - groupId should be removed (child has no explicit groupId, parent is in reactor)
            // - artifactId should be removed (can be inferred from relativePath)
            // - version should be removed (child has no explicit version, parent is in reactor)
            assertNull(parentElement.child("groupId").orElse(null));

  <groupId>org.apache.maven.its.mng3023</groupId>
  <artifactId>parent</artifactId>
  <version>1</version>
  <packaging>pom</packaging>

  <name>Maven Integration Test :: MNG-3023</name>
  <description>Test that reactor projects are included in dependency resolution.</description>

  <modules>
    <module>dependency</module>
    <module>consumer</module>
  </modules>

                    .desc(
                            "Resume reactor from the last failed project, using the resume.properties file in the build directory")
                    .get());
            options.addOption(Option.builder(RESUME_FROM)
                    .longOpt("resume-from")
                    .hasArg()
                    .desc("Resume reactor from specified project")
                    .get());