doExecute(session, mojoExecution, dependencyContext);
    }

    /**
     * Aggregating mojo executions (possibly) modify all MavenProjects, including those that are currently in use
     * by concurrently running mojo executions. To prevent race conditions, an aggregating execution will block
     * all other executions until finished.

        if (extensionRecord == null) {
            ClassRealm extensionRealm = classRealmManager.createExtensionRealm(plugin, toAetherArtifacts(artifacts));

            // TODO figure out how to use the same PluginDescriptor when running mojos

            PluginDescriptor pluginDescriptor = null;
            if (plugin.isExtensions() && !artifacts.isEmpty()) {
                // ignore plugin descriptor parsing errors at this point

                    }
                } while (!completedBuilds.contains(projectBuild));
            }
            running = false;
        }

        /*
        Wait until we are sure the print-stream thread is running.
         */

        public void waitUntilRunning(boolean expect) {
            while (!running == expect) {
                try {
                    Thread.sleep(10);

          <type>boolean</type>
          <description>Flags this Mojo to require running inside of a project.</description>
          <defaultValue>true</defaultValue>
        </field>
        <field>
          <name>projectRequired</name>
          <version>2.0.0+</version>
          <type>boolean</type>
          <description>Flags this Mojo to require running inside of a project.</description>
          <defaultValue>true</defaultValue>

  still active, we only need to worry about this case when the server container
  is <<not>> installed on localhost. This allows the popular pattern of starting
  a server container in-JVM, running tests against it, and shutting it down.

** SCM mojos

  See below for discussion on SCM-related operations. Any mojo which
  carries out some analysis or other interaction with a SCM system

                for (Dependency dependency : result.getUnresolvedDependencies()) {
                    logger.warn("o {}", dependency);
                }

                logger.warn("Try running the build up to the lifecycle phase \"package\"");
            } else {
                throw new LifecycleExecutionException(messageBuilderFactory, null, project, e);
            }
        }

    private boolean isProjectPresent = true;

    // ----------------------------------------------------------------------------
    // We need to allow per execution user and global settings as the embedder
    // might be running in a mode where it's executing many threads with totally
    // different settings.
    // ----------------------------------------------------------------------------

    private File userSettingsFile;

                        master.put(key, element);

                        if (!pending.isEmpty()) {
                            predecessors.put(key, pending);
                            pending = new ArrayList<>();
                        }
                    } else {
                        pending.add(element);
                    }
                }