* by name on a dependency that does not exist on the target component.
 */
public class RequestedConfigurationNotFoundFailure extends AbstractConfigurationSelectionFailure {
    public RequestedConfigurationNotFoundFailure(String requestedConfigurationName, ComponentIdentifier requestedComponent) {
        super(requestedConfigurationName, requestedComponent.getDisplayName());
    }

import org.gradle.internal.component.resolution.failure.type.RequestedConfigurationNotFoundFailure;

import java.util.List;
import java.util.Optional;

/**
 * A {@link ResolutionFailureDescriber} that describes a {@link RequestedConfigurationNotFoundFailure}.
 */
public abstract class RequestedConfigurationNotFoundFailureDescriber extends AbstractResolutionFailureDescriber<RequestedConfigurationNotFoundFailure> {
    @Override

/**
 * A {@link ResolutionFailure} that represents a specialization of {@link RequestedConfigurationNotFoundFailure} when
 * a configuration is requested by name on an external dependency and does not exist on the target component.
 */
public final class ExternalRequestedConfigurationNotFoundFailure extends RequestedConfigurationNotFoundFailure {
    private final String fromConfigurationName;

import org.gradle.internal.component.resolution.failure.type.NoMatchingCapabilitiesFailure;
import org.gradle.internal.component.resolution.failure.type.RequestedConfigurationNotFoundFailure;
import org.gradle.internal.component.resolution.failure.type.ResolutionFailure;
import org.gradle.internal.component.resolution.failure.type.UnknownArtifactSelectionFailure;

    }

    public AbstractResolutionFailureException configurationNotFoundFailure(ComponentIdentifier toComponent, String toConfigurationName) {
        RequestedConfigurationNotFoundFailure failure = new RequestedConfigurationNotFoundFailure(toConfigurationName, toComponent);
        return describeFailure(failure);
    }

    private final Demonstration externalConfigurationNotFound = new Demonstration("External configuration not found", ConfigurationSelectionException.class, RequestedConfigurationNotFoundFailure.class, this.&setupExternalConfigurationNotFound)