return builder.build();
    }

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

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

    @Override

            mergePlugin_ArtifactId(builder, target, source, sourceDominant, context);
            mergePlugin_Version(builder, target, source, sourceDominant, context);
            mergePlugin_Extensions(builder, target, source, sourceDominant, context);
            mergePlugin_Executions(builder, target, source, sourceDominant, context);
            mergePlugin_Dependencies(builder, target, source, sourceDominant, context);
            return builder.build();

                    Object key = getPluginKey().apply(element);
                    Plugin existing = master.get(key);
                    if (existing != null) {
                        existing = mergePlugin(existing, element, sourceDominant, context);
                        master.put(key, existing);
                        if (!pending.isEmpty()) {
                            predecessors.put(key, pending);

                    Object key = getPluginKey().apply(element);
                    Plugin existing = merged.get(key);
                    if (existing != null) {
                        element = mergePlugin(existing, element, sourceDominant, context);
                    } else {
                        added.put(key, element);
                    }
                    merged.put(key, element);
                }

                        element = mergePlugin(element, managedPlugin, false, context);
                    }
                    newPlugins.add(element);
                }
                return target.withPlugins(newPlugins);
            }
            return target;
        }

        @Override
        protected void mergePlugin_Executions(
                Plugin.Builder builder,

            ModelBase target,
            ModelBase source,
            boolean sourceDominant,
            Map<Object, Object> context) {
        // don't merge
    }

    @Override
    protected void mergePlugin_Dependencies(
            Plugin.Builder builder, Plugin target, Plugin source, boolean sourceDominant, Map<Object, Object> context) {
        Iterator<Dependency> sourceIterator = source.getDependencies().iterator();

                    Object key = getPluginKey().apply(element);
                    Plugin existing = merged.get(key);
                    if (existing != null) {
                        element = mergePlugin(existing, element, sourceDominant, context);
                    } else {
                        added.put(key, element);
                    }
                    merged.put(key, element);
                }

                builder.location("developerConnection", source.getLocation("developerConnection"));
            }
        }
    }

    @Override
    protected void mergePlugin_Executions(
            Plugin.Builder builder, Plugin target, Plugin source, boolean sourceDominant, Map<Object, Object> context) {
        List<PluginExecution> src = source.getExecutions();
        if (!src.isEmpty()) {