*/
    DefaultProblem(
            String message, Severity severity, String source, int lineNumber, int columnNumber, Exception exception) {
        this.message = message;
        this.severity = (severity != null) ? severity : Severity.ERROR;
        this.source = (source != null) ? source : "";
        this.lineNumber = lineNumber;
        this.columnNumber = columnNumber;
        this.exception = exception;

            throw new IllegalArgumentException("reader or inputStream must be non null");
        }
        try {
            InputSource source = null;
            if (request.getModelId() != null || request.getLocation() != null) {
                source = new InputSource(request.getLocation());
            }
            SettingsStaxReader xml = new SettingsStaxReader();

        public void mergeModelBase(ModelBase.Builder builder, ModelBase target, ModelBase source) {
            mergeModelBase(builder, target, source, true, Collections.emptyMap());
        }

        public void mergeBuildBase(BuildBase.Builder builder, BuildBase target, BuildBase source) {
            mergeBuildBase(builder, target, source, true, Collections.emptyMap());
        }

        @Override

            throw new IllegalArgumentException("reader or inputStream must be non null");
        }
        try {
            InputSource source = null;
            if (request.getModelId() != null || request.getLocation() != null) {
                source = new InputSource(request.getLocation());
            }
            SettingsStaxReader xml = new SettingsStaxReader();

    }

    /**
     * DuplicateMerger
     */
    protected static class DuplicateMerger extends MavenModelMerger {

        public Plugin mergePlugin(Plugin target, Plugin source) {
            return super.mergePlugin(target, source, false, Collections.emptyMap());
        }
    }

    @Override
    public Model injectDefaultValues(Model model, ModelBuilderRequest request, ModelProblemCollector problems) {

 * that exhibits the problem.
 */
class DefaultBuilderProblem implements BuilderProblem {
    final String source;
    final int lineNumber;
    final int columnNumber;
    final Exception exception;
    final String message;
    final Severity severity;

    DefaultBuilderProblem(

    Object getConfiguration();

    /**
     * Sets the configuration to unmarshal into the bean. The configuration should be taken from
     * {@link org.apache.maven.model.ConfigurationContainer#getConfiguration()} or a similar source.
     * Fully equivalent to {@code setConfiguration(configuration, null)}.
     *
     * @param configuration The configuration to unmarshal, may be {@code null}.
     * @return This request for chaining, never {@code null}.

        throws IOException
    {
        Validate.notEmpty( uri, "uri can neither be null nor empty " );
        ModelDataSource source = new DefaultModelDataSource();
        source.init( domainModel.getModelProperties(), null );
        return source.queryFor( uri ).size();
    }
    */

    public Iterator<?> getIteratorForXPathExpression(String expression) {
        return context.iterate(expression);

    //
    void putArtifact(
            File source, Artifact artifact, ArtifactRepository deploymentRepository, TransferListener downloadMonitor)
            throws TransferFailedException;

    void putRemoteFile(ArtifactRepository repository, File source, String remotePath, TransferListener downloadMonitor)
            throws TransferFailedException;

// wiring and reference and external source for the lifecycle configuration.
@Named
@Singleton
public class DefaultLifecycles {
    public static final String[] STANDARD_LIFECYCLES = {"clean", "default", "site", "wrapper"};

    private final Logger logger = LoggerFactory.getLogger(getClass());

    // @Configuration(source="org/apache/maven/lifecycle/lifecycles.xml")

    private final Lookup lookup;