private List<String> fatals = new ArrayList<>();

    public SimpleProblemCollector() {}

    public SimpleProblemCollector(Model model) {
        this.model = model;
    }

    public Model getModel() {
        return model;
    }

    public List<String> getWarnings() {
        return warnings;
    }

    public List<String> getErrors() {
        return errors;
    }

        return result;
    }

    /**
     * Gets the model that could not be built properly.
     *
     * @return The erroneous model or {@code null} if not available.
     */
    public Model getModel() {
        if (result == null) {
            return null;
        }
        if (result.getEffectiveModel() != null) {
            return result.getEffectiveModel();
        }
        return result.getRawModel();

    public Map<String, String> getEffectiveProperties(@Nullable Project project) {
        HashMap<String, String> result = new HashMap<>(getSystemProperties());
        if (project != null) {
            result.putAll(project.getModel().getProperties());
        }
        result.putAll(getUserProperties());
        return result;
    }

    @Nonnull
    @Override
    public Version getMavenVersion() {

    }

    public Source getSource() {
        return source;
    }

    /**
     * Gets the model being wrapped.
     *
     * @return The model or {@code null} if not set.
     */
    public Model getModel() {
        return model;
    }

    /**
     * Gets the effective group identifier of the model.
     *
     * @return The effective group identifier of the model or an empty string if unknown, never {@code null}.

        for (MavenProject mavenProject : projects) {
            if (!"maven-plugin".equals(mavenProject.getPackaging())) {
                Prerequisites prerequisites =
                        mavenProject.getModel().getDelegate().getPrerequisites();
                if (prerequisites != null && prerequisites.getMaven() != null) {
                    logger.warn(
                            "The project {} uses prerequisites"

    public Plugin getPluginDefinitionForPrefix(String prefix, MavenSession session, MavenProject project) {
        PluginPrefixRequest request = new DefaultPluginPrefixRequest(prefix, session);
        request.setPom(project.getModel());

        try {
            PluginPrefixResult result = pluginPrefixResolver.resolve(request);

            Plugin plugin = new Plugin();
            plugin.setGroupId(result.getGroupId());

            deferDeleteFile(consumer);

            project.addAttachedArtifact(createConsumerPomArtifact(project, consumer, session));
        } else if (project.getModel().getDelegate().isRoot()) {
            throw new IllegalStateException(
                    "The use of the root attribute on the model requires the buildconsumer feature to be active");
        }
    }

    public Map<String, String> getEffectiveProperties(Project project) {
        HashMap<String, String> result = new HashMap<>(getSystemProperties());
        if (project != null) {
            result.putAll(project.getModel().getProperties());
        }
        result.putAll(getUserProperties());
        return result;
    }

    @Override
    public Version getMavenVersion() {
        return null;
    }

            model = model.withPomFile(((FileModelSource) modelSource).getPath());
        }

        Model retModel = new Model(model);

        problems.setSource(retModel);

        modelValidator.validateFileModel(retModel, request, problems);

        if (hasFatalErrors(problems)) {
            throw problems.newModelBuildingException();
        }

    }

    @Override
    public Model findModel(Artifact artifact) {
        MavenProject project = getProject(artifact);
        return project == null ? null : project.getModel().getDelegate();
    }

    //
    // Implementation
    //

    private File findArtifact(MavenProject project, Artifact artifact, boolean checkUptodate) {