* @param severity
     * @param version
     */
    public ModelProblemCollectorRequest(Severity severity, Version version) {
        this.severity = Objects.requireNonNull(severity, "severity cannot be null");
        this.version = Objects.requireNonNull(version, "version cannot be null");
    }

    public Severity getSeverity() {
        return severity;
    }

    public Version getVersion() {

import org.apache.maven.api.cli.mvn.MavenInvokerRequest;
import org.apache.maven.api.cli.mvn.MavenOptions;
import org.apache.maven.cling.invoker.BaseInvokerRequest;

import static java.util.Objects.requireNonNull;

/**
 * Maven execution request.
 *
 * @param <O> the options type this request carries
 */
public class DefaultMavenInvokerRequest<O extends MavenOptions> extends BaseInvokerRequest<O>

       *
       * This read is guaranteed to get us the right value because we only set this once (here).
       *
       * requireNonNull is safe because either our compareAndSet succeeded or it failed because
       * another thread did it for us.
       */
      seenExceptionsLocal = requireNonNull(seenExceptions);
    }
    return seenExceptionsLocal;
  }

  private static <N, V> Map<EndpointPair<N>, V> edgeValueMap(final ValueGraph<N, V> graph) {
    return Maps.asMap(
        graph.edges(),
        edge ->
            // requireNonNull is safe because the endpoint pair comes from the graph.
            requireNonNull(graph.edgeValueOrDefault(edge.nodeU(), edge.nodeV(), null)));
  }

import org.apache.maven.api.cli.InvokerRequest;
import org.apache.maven.api.cli.Options;
import org.apache.maven.api.cli.ParserException;
import org.codehaus.plexus.classworlds.ClassWorld;

import static java.util.Objects.requireNonNull;

/**
 * The CLI "new-gen".
 *
 * @param <O> the options type
 * @param <R> the request type
 */
public abstract class ClingSupport<O extends Options, R extends InvokerRequest<O>> {

    }

    public ClassRealm getCoreRealm() {
        return containerRealm;
    }

    public ClassRealm createProjectRealm(Model model, List<Artifact> artifacts) {
        Objects.requireNonNull(model, "model cannot be null");

        ClassLoader parent = getMavenApiRealm();

        return createRealm(getKey(model), RealmType.Project, parent, null, null, artifacts);
    }

    if (effectiveRange.isEmpty()) {
      empty = true;
    } else {
      /*
       * requireNonNull is safe because the effectiveRange operations above would have thrown or
       * effectiveRange.isEmpty() would have returned true.
       */
      C afterLower = requireNonNull(range.lowerBound.leastValueAbove(domain));
      C beforeUpper = requireNonNull(range.upperBound.greatestValueBelow(domain));

        converterLookup = new EnhancedConverterLookup();
    }

    public void configureBean(BeanConfigurationRequest request) throws BeanConfigurationException {
        Objects.requireNonNull(request, "request cannot be null");
        Objects.requireNonNull(request.getBean(), "request.bean cannot be null");

        Object configuration = request.getConfiguration();
        if (configuration == null) {
            return;
        }

import org.apache.maven.api.cli.mvnenc.EncryptInvokerRequest;
import org.apache.maven.api.cli.mvnenc.EncryptOptions;
import org.apache.maven.cling.invoker.BaseInvokerRequest;

import static java.util.Objects.requireNonNull;

public class DefaultEncryptInvokerRequest extends BaseInvokerRequest<EncryptOptions> implements EncryptInvokerRequest {
    private final EncryptOptions options;

    @SuppressWarnings("ParameterNumber")

              lock.unlock();
            }
          });
    }

    @Override
    protected final void doStop() {
      // Both requireNonNull calls are safe because doStop can run only after a successful doStart.
      requireNonNull(runningTask);
      requireNonNull(executorService);
      runningTask.cancel(false);
      executorService.execute(
          () -> {
            try {
              lock.lock();