public static Path getCanonicalPath(Path path) {
        requireNonNull(path, "path");
        try {
            return path.toRealPath();
        } catch (IOException e) {
            return getCanonicalPath(path.getParent()).resolve(path.getFileName());
        }
    }

    @Nonnull
    public static Map<String, String> toMap(Properties properties) {
        requireNonNull(properties, "properties");

    private final Lookup lookup;

    public PlexusContainerCapsule(ClassLoader previousClassLoader, PlexusContainer plexusContainer) {
        this.previousClassLoader = requireNonNull(previousClassLoader, "previousClassLoader");
        this.plexusContainer = requireNonNull(plexusContainer, "plexusContainer");
        this.lookup = new DefaultLookup(plexusContainer);
    }

    @Override
    public Lookup getLookup() {
        return lookup;

import java.io.Serializable;

import static java.util.Objects.requireNonNull;

public abstract class BaseObject implements Serializable, Cloneable {
    protected transient ChildrenTracking childrenTracking;

    protected Object delegate;

    public BaseObject() {}

    public BaseObject(Object delegate, BaseObject parent) {
        this.delegate = requireNonNull(delegate, "delegate cannot be null");

                Objects.requireNonNull(remoteRepositoryManager, "remoteRepositoryManager cannot be null");
        this.versionResolver = Objects.requireNonNull(versionResolver, "versionResolver cannot be null");
        this.versionRangeResolver = Objects.requireNonNull(versionRangeResolver, "versionRangeResolver cannot be null");
        this.artifactResolver = Objects.requireNonNull(artifactResolver, "artifactResolver cannot be null");

import org.apache.maven.artifact.handler.DefaultArtifactHandler;
import org.apache.maven.eventspy.AbstractEventSpy;
import org.apache.maven.execution.ExecutionEvent;

import static java.util.Objects.requireNonNull;

/**
 */
@Named
@Singleton
public class LegacyArtifactHandlerManager extends AbstractEventSpy {
    private final Map<String, ArtifactHandler> artifactHandlers;

        this.parserRequest = requireNonNull(parserRequest);
        this.cwd = requireNonNull(cwd);
        this.installationDirectory = requireNonNull(installationDirectory);
        this.userHomeDirectory = requireNonNull(userHomeDirectory);
        this.userProperties = requireNonNull(userProperties);
        this.systemProperties = requireNonNull(systemProperties);

      RegularImmutableMap<K, V> empty = (RegularImmutableMap<K, V>) EMPTY;
      return empty;
    } else if (n == 1) {
      // requireNonNull is safe because the first `2*n` elements have been filled in.
      checkEntryNotNull(
          requireNonNull(alternatingKeysAndValues[0]), requireNonNull(alternatingKeysAndValues[1]));
      return new RegularImmutableMap<K, V>(null, alternatingKeysAndValues, 1);
    }

                MessageBuilderFactory messageBuilderFactory) {
            this.command = requireNonNull(command, "command");
            this.commandName = requireNonNull(commandName, "commandName");
            this.args = requireNonNull(args, "args");
            this.logger = requireNonNull(logger, "logger");
            this.messageBuilderFactory = requireNonNull(messageBuilderFactory, "messageBuilderFactory");
        }

public class DefaultModelWriter implements ModelWriter {

    @Override
    public void write(File output, Map<String, Object> options, Model model) throws IOException {
        Objects.requireNonNull(output, "output cannot be null");
        Objects.requireNonNull(model, "model cannot be null");

        output.getParentFile().mkdirs();

        write(new XmlStreamWriter(Files.newOutputStream(output.toPath())), options, model);
    }

          submittingTaskQueue.nextTask = task;
          // requireNonNull(delegate) is safe for reasons similar to requireNonNull(sequencer).
          submittingTaskQueue.nextExecutor = requireNonNull(delegate);
          delegate = null;
        } else {
          // requireNonNull(delegate) is safe for reasons similar to requireNonNull(sequencer).
          Executor localDelegate = requireNonNull(delegate);
          delegate = null;