*/
    void mergeDuplicates(Model model, ModelBuildingRequest request, ModelProblemCollector problems);

    /**
     * Sets default values in the specified model that for technical reasons cannot be set directly in the Modello
     * definition.
     *
     * @param model The model in which to set the default values, must not be {@code null}.

 * <p>Use this class instead of direct calls to {@link System#nanoTime} for two reasons:
 *
 * <ul>
 *   <li>The raw {@code long} values returned by {@code nanoTime} are meaningless and unsafe to use
 *       in any other way than how {@code Stopwatch} uses them.
 *   <li>An alternative source of nanosecond ticks can be substituted, for example for testing or
 *       performance reasons, without affecting most of your code.
 * </ul>
 *

import org.eclipse.aether.repository.RemoteRepository;
import org.eclipse.aether.repository.RepositoryPolicy;

/**
 * <strong>Warning:</strong> This is an internal utility class that is only public for technical reasons, it is not part
 * of the public API. In particular, this class can be changed or deleted without prior notice.
 *
 * @deprecated since 4.0.0, use {@code maven-api-impl} jar instead
 */
@Deprecated(since = "4.0.0")

import org.eclipse.aether.metadata.MergeableMetadata;
import org.eclipse.aether.metadata.Metadata;

/**
 * <strong>Warning:</strong> This is an internal utility class that is only public for technical reasons, it is not part
 * of the public API. In particular, this class can be changed or deleted without prior notice.
 *
 */
@Deprecated
public final class MetadataBridge extends AbstractMetadata implements MergeableMetadata {

        DefaultRepositorySystemSession session = new DefaultRepositorySystemSession(h -> false); // no close handle

        // for technical reasons we cannot throw here, even if delegate does cancel transfer
        listener.transferInitiated(event(session, resource, TransferEvent.EventType.INITIATED));

import org.eclipse.aether.artifact.Artifact;

/**
 * Manages the class realms used by Maven. <strong>Warning:</strong> This is an internal utility interface that is only
 * public for technical reasons, it is not part of the public API. In particular, this interface can be changed or
 * deleted without prior notice.
 *
 */
public interface ClassRealmManager {

    /**

import org.codehaus.plexus.configuration.xml.XmlPlexusConfiguration;
import org.codehaus.plexus.util.xml.Xpp3Dom;

/**
 * <strong>Warning:</strong> This is an internal class that is only public for technical reasons, it is not part of the
 * public API. In particular, this class can be changed or deleted without prior notice.
 *
 */
@Named
@Singleton
public class DefaultBeanConfigurator implements BeanConfigurator {

       * timeoutFuture can be set (and delegate cancelled) only once. (And "set only once" is
       * important for other reasons: run() can still be invoked concurrently in different threads,
       * even with the above null checks.)
       */
      timeoutFutureRef = null;
      if (delegate.isDone()) {
        timeoutFuture.setFuture(delegate);
      } else {
        try {

import org.eclipse.aether.repository.LocalRepositoryManager;
import org.eclipse.aether.repository.RemoteRepository;

/**
 * <strong>Warning:</strong> This is an internal utility class that is only public for technical reasons, it is not part
 * of the public API. In particular, this class can be changed or deleted without prior notice.
 *
 */
@Deprecated
public class LegacyLocalRepositoryManager implements LocalRepositoryManager {

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

/**
 * Manages the class realms used by Maven. <strong>Warning:</strong> This is an internal utility class that is only
 * public for technical reasons, it is not part of the public API. In particular, this class can be changed or deleted
 * without prior notice.
 *
 */
@Named
@Singleton
public class DefaultClassRealmManager implements ClassRealmManager {