prefix + prefix2 + "(groupId:artifactId)",
                        null,
                        "groupId of a plugin must be defined. ",
                        plugin);
            }

            if (plugin.getArtifactId() == null
                    || (plugin.getArtifactId() != null
                            && plugin.getArtifactId().trim().isEmpty())) {
                addViolation(

    /**
     * Decrypts passwords in the settings.
     *
     * @param request The settings decryption request that holds the parameters, must not be {@code null}.
     * @return The result of the settings decryption, never {@code null}.
     */
    SettingsDecryptionResult decrypt(SettingsDecryptionRequest request);

        Build build = model.getBuild();
        if (build != null) {
            List<Plugin> plugins = build.getPlugins();
            Map<Object, Plugin> normalized = new LinkedHashMap<>(plugins.size() * 2);

            for (Plugin plugin : plugins) {
                Object key = plugin.getKey();
                Plugin first = normalized.get(key);
                if (first != null) {
                    merger.mergePlugin(plugin, first);

        return new EncryptContext(
                invokerRequest, (EncryptOptions) invokerRequest.options().orElse(null));
    }

    @Override
    protected void lookup(EncryptContext context) throws Exception {
        if (context.goals == null) {
            super.lookup(context);
            context.goals = context.lookup.lookupMap(Goal.class);
        }
    }

    @Override

        return new UpgradeContext(
                invokerRequest, (UpgradeOptions) invokerRequest.options().orElse(null));
    }

    @Override
    protected void lookup(UpgradeContext context) throws Exception {
        if (context.goals == null) {
            super.lookup(context);
            context.goals = context.lookup.lookupMap(Goal.class);
        }
    }

    @Override

        try {
            return new PersistedToolchains(delegate.read(reader, strict, null));
        } catch (XMLStreamException e) {
            throw new XmlPullParserException(e.getMessage(), null, e);
        }
    }

    /**
     * @param reader a reader object.
     * @return PersistedToolchains
     * @throws IOException IOException if any.

    Set<CombinedInterface> getSetProp() { return null; }

    Map<CombinedInterface, JavaClassWithParameterizedTypes> getMapProp() { return null; }

    List<?> getWildcardProp() { return null; }

    List<? extends CombinedInterface> getUpperBoundProp() { return null; }

    List<? super CombinedInterface> getLowerBoundProp() { return null; }

    public String toString() {
        return "[" + (md == null ? "no metadata" : md.toString()) + "]";
    }

    // ---------------------------------------------------------------------
    private static int compareStrings(String s1, String s2) {
        if (s1 == null && s2 == null) {
            return 0;
        }

        if (s1 == null /* && s2 != null */) {
            return -1;
        }

        if (

                    if (pluginMgmt != null) {
                        for (Plugin managedPlugin : pluginMgmt.getPlugins()) {
                            Object key = getPluginKey(managedPlugin);
                            Plugin addedPlugin = added.get(key);
                            if (addedPlugin != null) {
                                Plugin plugin = managedPlugin.clone();

                org.eclipse.aether.artifact.Artifact resolverArtifact = RepositoryUtils.toArtifact(artifact);
                return resolverArtifact != null ? session.getArtifact(resolverArtifact) : null;
            }

            @Override
            public Map<String, Dependency> getDependenciesMap() {
                DependencyNode resolverNode =