private final EventSpyDispatcher dispatcher;

    private final ExecutionListener delegate;

    EventSpyExecutionListener(EventSpyDispatcher dispatcher, ExecutionListener delegate) {
        this.dispatcher = dispatcher;
        this.delegate = delegate;
    }

    @Override
    public void projectDiscoveryStarted(ExecutionEvent event) {
        dispatcher.onEvent(event);

    private final EventSpyDispatcher dispatcher;

    private final RepositoryListener delegate;

    EventSpyRepositoryListener(EventSpyDispatcher dispatcher, RepositoryListener delegate) {
        this.dispatcher = dispatcher;
        this.delegate = delegate;
    }

    @Override
    public void artifactDeployed(RepositoryEvent event) {
        dispatcher.onEvent(event);
        delegate.artifactDeployed(event);

import org.apache.maven.eventspy.EventSpy;
import org.apache.maven.execution.ExecutionListener;
import org.eclipse.aether.RepositoryListener;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

/**
 * Dispatches callbacks to all registered EventSpies.
 * @since 3.0.2
 */
@Named
@Singleton
public class EventSpyDispatcher {
    private final Logger logger = LoggerFactory.getLogger(getClass());

        // == sanity check
        if (result.size() != DependencyScope.values().length - 1) { // sans "undefined"
            throw new IllegalStateException("Maven4 API dependency scope mismatch");
        }

        return result;
    }

    @Override
    public Collection<org.eclipse.aether.scope.ResolutionScope> buildResolutionScopes(
            InternalScopeManager internalScopeManager) {

            }
        };
    }

    @SuppressWarnings("unchecked")
    private <T> T createProxy(Key<T> key, Provider<T> unscoped) {
        InvocationHandler dispatcher = (proxy, method, args) -> {
            method.setAccessible(true);
            try {
                return method.invoke(getScopeState().scope(key, unscoped).get(), args);

  simply returns the expression itself as the resolved value, which adds
  very little value to the container. Things like ${project.build.resources}
  are not resolved, and result in a type mismatch for the member injection.

  We need a replacement for DefaultExpressionEvaluator that is capable of
  traversing an object graph and extracting Object values, not just Strings.

* ComponentConfigurator

     *
     * @return the paths of all dependencies
     */
    @Nonnull
    List<Path> getPaths();

    /**
     * Returns the file paths of all dependencies, dispatched according the tool options where to place them.
     * The {@link PathType} keys identify, for example, {@code --class-path} or {@code --module-path} options.