need it so that empty directory does not get deleted...

     * Sets the project's class realm. <strong>Warning:</strong> This is an internal utility method that is only public
     * for technical reasons, it is not part of the public API. In particular, this method can be changed or deleted
     * without prior notice and must not be used by plugins.
     *
     * @param classRealm The class realm hosting the build extensions of this project, may be {@code null}.
     */

 * under the License.
 */
package org.apache.maven.lifecycle.internal;

/**
 * A task that is a goal.
 * <p>
 * <strong>NOTE:</strong> This class is not part of any public api and can be changed or deleted without prior notice.
 *
 * @since 3.0
 */
public final class GoalTask extends Task {
    public GoalTask(String pluginGoal) {
        super(pluginGoal);
    }

                    for (Path path : (Iterable<Path>) paths::iterator) {
                        Files.delete(path);
                    }
                }
                try {
                    Files.delete(artifactPath);
                    Files.delete(artifactPath.getParent());
                    Files.delete(artifactPath.getParent().getParent());
                } catch (DirectoryNotEmptyException e) {

 * internal utility component that is only public for technical reasons, it is not part of the public API. In
 * particular, this component can be changed or deleted without prior notice.
 *
 * @since 3.0
 */
@Named
@Singleton
public class DefaultLegacySupport implements LegacySupport {

/**
 * Assists the project builder. <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.
 *
 * @since 3.0
 */
public class EnvironmentUtils {

    private static Properties envVars;

    /**

/**
 * Caches project class realms. <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 ProjectRealmCache {

    /**
     * A cache key.
     */
    interface Key {
        // marker interface for cache keys
    }

    /**

        Path afterPomFile =
                Paths.get("src/test/resources/projects/transform/after.pom").toAbsolutePath();
        Path tempFile = Files.createTempFile("", ".pom");
        Files.delete(tempFile);
        try (InputStream expected = Files.newInputStream(beforePomFile)) {
            Model model = new Model(new MavenStaxReader().read(expected));
            MavenProject project = new MavenProject(model);

            if (file.exists()) {
                if (file.isDirectory()) {
                    FileUtils.deleteDirectory(file);
                } else {
                    file.delete();
                }
            }

            it.remove();
        }

        warnAboutCleanup = false;
    }

 *
 * @since 3.0
 *         Builds one or more lifecycles for a full module
 *         NOTE: This class is not part of any public api and can be changed or deleted without prior notice.
 */
@Named
@Singleton
public class BuilderCommon {
    private final Logger logger;
    private final LifecycleDebugLogger lifecycleDebugLogger;