.collect(Collectors.toList());

        if (!unversionedPlugins.isEmpty()) {
            logger.warn("Version not locked for default bindings plugins " + unversionedPlugins
                    + ", you should define versions in pluginManagement section of your " + "pom.xml or parent");
        }

        return executionPlan;
    }

    public void handleBuildError(
            final ReactorContext buildContext,

  manager.

* Assumptions: What is Offline?

  For the purposes of determining the areas sensitive to offline status,
  it is definitely useful to define what the offline state really means.

  [[1]] This is obvious, but the network/internet is unavailable.

  [[2]] Localhost (127.0.0.1) may also be unavailable if the whole
        network stack is offline.

                List<String> exports = exportedPackages.get(extensionRealm);

                if (exports == null || exports.isEmpty()) {
                    /*
                     * Most existing extensions don't define exported packages, i.e. no classes are to be exposed to
                     * plugins, yet the components provided by the extension (e.g. artifact handlers) must be

     * <p>
     * Effective properties are computed from system, user and optionally project properties, layered with
     * defined precedence onto each other to achieve proper precedence. Precedence is defined as:
     * <ul>
     *     <li>System properties (lowest precedence)</li>
     *     <li>Project properties (optional)</li>
     *     <li>User properties (highest precedence)</li>

     * configuration expansion (merging configuration defined globally for a given plugin
     * using {@link org.apache.maven.api.model.Plugin#getConfiguration()}
     * into the configuration for each {@link org.apache.maven.api.model.PluginExecution}.
     */
    boolean isProcessPlugins();

    /**
     * Defines external profiles that may be activated for the given model.

        Settings effective =
                settingsMerger.merge(user, settingsMerger.merge(project, global, false, null), false, null);

        // If no repository is defined in the user/global settings,
        // it means that we have "old" settings (as those are new in 4.0)
        // so add central to the computed settings for backward compatibility.
        if (effective.getRepositories().isEmpty()

                if (result < 0 || (result == 0 && (!lowerBoundInclusive || !upperBoundInclusive))) {
                    throw new InvalidVersionSpecificationException("Range defies version ordering: " + spec);
                }
            }

            restriction = new Restriction(lowerVersion, lowerBoundInclusive, upperVersion, upperBoundInclusive);
        }

        </field>
        <field>
          <name>phase</name>
          <version>1.0.0+</version>
          <type>String</type>
          <description>
            Defines a default phase to bind a Mojo execution to if the user does not explicitly set a phase in the POM.
            &lt;p>&lt;b>Note:&lt;/b> This will not automagically make a Mojo run when the plugin declaration is added

                                </requireJavaVersion>
                                <requireNoRepositories>
                                    <message>Best Practice is to never define repositories in pom.xml (use a repository
                                        manager instead).
                                    </message>
                                </requireNoRepositories>

- plugin execution error due to something that is not expected to go wrong (the compiler executable missing)
- asking to use a plugin for which you do not have a version defined - tools to easily select versions
- goal not found in a plugin (probably could list the ones that are)

 */

// PluginNotFoundException, PluginResolutionException, PluginDescriptorParsingException,