return success(model, problemsList);
    }

    /**
     * Error with problems describing the cause
     *
     * @param problems
     */
    public static <T> Result<T> error(Iterable<? extends ModelProblem> problems) {
        return error(null, problems);
    }

    public static <T> Result<T> error(T model) {
        return error(model, Collections.emptyList());
    }

        if (messages.size() == 0) {
            return indentation + "There were no validation errors.";
        }

        StringBuilder message = new StringBuilder();

        //        if ( messages.size() == 1 )
        //        {
        //            message.append( "There was 1 validation error: " );
        //        }
        //        else
        //        {

     */
    List<Dependency> getUnresolvedDependencies();

    /**
     * Gets the errors that occurred while building the dependency graph.
     *
     * @return The errors that occurred while building the dependency graph, never {@code null}.
     */
    List<Exception> getCollectionErrors();

    /**
     * Gets the errors that occurred while resolving the specified dependency.
     *

import org.apache.maven.plugin.descriptor.PluginDescriptor;

/**
 * MavenPluginValidator
 */
public interface MavenPluginValidator {

    void validate(Artifact pluginArtifact, PluginDescriptor pluginDescriptor, List<String> errors);

        List<Exception> errors = resolutionErrors.get(dependency);
        return (errors != null) ? Collections.unmodifiableList(errors) : Collections.emptyList();
    }

    public void setResolutionErrors(Dependency dependency, List<Exception> errors) {
        dependencies.add(dependency);
        unresolvedDependencies.add(dependency);
        resolutionErrors.put(dependency, errors);
    }

                result.getProject().getModel().getPomFile().getAbsoluteFile());
        int errors = 0;
        for (ModelProblem p : result.getProblems()) {
            if (p.getSeverity() == ModelProblem.Severity.ERROR) {
                errors++;
            }
        }
        assertEquals(0, errors);
    }

    @Test
    void testLocationTrackingResolution() throws Exception {

 * under the License.
 */
package org.apache.maven.api.services.model;

/**
 * Defines events that the model builder fires during construction of the effective model. When a listener encounters
 * errors while processing the event, it can report these problems via {@link ModelBuildingEvent#problems()}.
 */
public interface ModelBuildingListener {

    /**

    /**
     * Creates a {@link org.apache.maven.api.Project} from a POM file.
     *
     * @param request {@link ProjectBuilderRequest}
     * @return the {@link ProjectBuilderResult} containing the built project and possible errors
     * @throws ProjectBuilderException if the project cannot be created
     * @throws IllegalArgumentException if an argument is {@code null} or invalid
     */
    @Nonnull

    private List<CyclicDependencyException> circularDependencyExceptions;

    private List<ArtifactResolutionException> errorArtifactExceptions;

    // file system errors

    private List<ArtifactRepository> repositories;

    private Set<Artifact> requestedArtifacts;

    private Set<Artifact> artifacts;

    private MetadataGraph dirtyTree;

                + "(" + result.getPomFile() + ") has "
                + children.size() + " error" + (children.size() == 1 ? "" : "s");

        return new ExceptionSummary(null, message, null, children);
    }

    private ExceptionSummary handle(ModelProblem problem, String projectId) {
        if (ModelProblem.Severity.ERROR.compareTo(problem.getSeverity()) >= 0) {
            String message = problem.getMessage();