normalized.put(key, plugin);
            }

            if (plugins.size() != normalized.size()) {
                builder.build(
                        Build.newBuilder(build).plugins(normalized.values()).build());
            }
        }

        /*
         * NOTE: This is primarily to keep backward-compat with Maven 2.x which did not validate that dependencies are

 * A test which demonstrates maven's recursive inheritance where
 * a distinct value is taken from each parent contributing to
 * the final model of the project being assembled. There is no
 * overriding going on amongst the models being used in this test:
 * each model in the lineage is providing a value that is not present
 * anywhere else in the lineage. We are just making sure that values
 * down in the lineage are bubbling up where they should.
 *
 */

            recessivePlugins.forEach(p -> mergedPlugins.put(p.getPrefix(), p));
            plugins.forEach(p -> mergedPlugins.put(p.getPrefix(), p));
            metadata = metadata.withPlugins(mergedPlugins.values());
        }
        // just carry-on as-is
        if (recessive.getVersioning() != null) {
            metadata = metadata.withVersioning(recessive.getVersioning());
        }
    }

    @Deprecated

                    return Collections.unmodifiableList(new ArrayList<>(delegate.getMojoDescriptor()
                            .getPluginDescriptor()
                            .getLifecycleMappings()
                            .values()));
                } catch (Exception e) {
                    throw new RuntimeException("Unable to load plugin lifecycles", e);
                }
            }

            @Override

    /**
     * Merges values from the specified profile into the given model. Implementations are expected to keep the profile
     * and model completely decoupled by injecting deep copies rather than the original objects from the profile.
     *
     * @param model The model into which to merge the values defined by the profile, must not be <code>null</code>.

                return lx - rx;
            }
        };

        Map<String, Lifecycle> lifecyclesMap = lookupLifecycles();

        // ensure canonical order of standard lifecycles
        return lifecyclesMap.values().stream()
                .peek(l -> Objects.requireNonNull(l.getId(), "A lifecycle must have an id."))
                .sorted(Comparator.comparing(Lifecycle::getId, comparator))
                .collect(Collectors.toList());

        List<String> versions = getProjects()
                .getOrDefault(artifact.getGroupId(), Collections.emptyMap())
                .getOrDefault(artifact.getArtifactId(), Collections.emptyMap())
                .values()
                .stream()
                .map(MavenProject::getVersion)
                .collect(Collectors.collectingAndThen(Collectors.toList(), Collections::unmodifiableList));
        if (!versions.isEmpty()) {

import org.apache.maven.api.services.ModelBuilderRequest;
import org.apache.maven.api.services.ModelProblemCollector;

/**
 * Checks the model for missing or invalid values.
 *
 */
public interface ModelValidator {
    /**
     * Checks the specified file model for missing or invalid values. This model is directly created from the POM
     * file and has not been subjected to inheritance, interpolation or profile/default injection.
     *

/**
 * Handles injection of plugin management into the model.
 *
 */
public interface PluginManagementInjector {

    /**
     * Merges default values from the plugin management section of the given model into itself.
     *
     * @param model The model into which to merge the values specified by its plugin management section, must not be
     *            <code>null</code>.

                    }
                    merged.put(key, element);
                }

                builder.executions(merged.values());
            }
        }

        @Override
        protected void mergeReporting_Plugins(
                Reporting.Builder builder,
                Reporting target,
                Reporting source,