Model target = new Model();
        Model source = new Model();
        target.setLicenses(new ArrayList<License>());
        License lic1 = new License();
        License lic2 = new License();
        target.getLicenses().add(lic1);
        source.setLicenses(new ArrayList<License>());
        source.getLicenses().add(lic2);

        new MavenMerger().mergeModel(target, source, false, null);

    protected void mergeModel_Licenses(
            Model.Builder builder, Model target, Model source, boolean sourceDominant, Map<Object, Object> context) {
        builder.licenses(target.getLicenses().isEmpty() ? source.getLicenses() : target.getLicenses());
    }

    @Override
    protected void mergeModel_Developers(
            Model.Builder builder, Model target, Model source, boolean sourceDominant, Map<Object, Object> context) {

        model.extraInfo = descriptor.getExtraInfo().asMap();
        model.description = descriptor.getDescription();

        model.authors.addAll(descriptor.getAuthors());
        model.licenses.addAll(descriptor.getLicenses());
        model.configurations.addAll(descriptor.getConfigurations().get());

        Set<IvyExcludeRule> globalExcludes = descriptor.getGlobalExcludes().getOrNull();
        if (globalExcludes != null) {

        if (pom.getDistributionManagement() != null) {
            model.setDistributionManagement(convertDistributionManagement(pom.getDistributionManagement()));
        }
        for (MavenPomLicense license : pom.getLicenses()) {
            model.addLicense(convertLicense(license));
        }
        for (MavenPomDeveloper developer : pom.getDevelopers()) {
            model.addDeveloper(convertDeveloper(developer));
        }