.allSteps()
                    .flatMap(step -> step.mojos.values().stream().flatMap(map -> map.values().stream()))
                    .map(MojoExecution::getPlugin)
                    .filter(p -> p.getLocation("version") != null
                            && p.getLocation("version").getSource() != null
                            && defaulModelId.equals(

                    .collect(Collectors.joining("\n\t"));
            PluginIncompatibleException pie = new PluginIncompatibleException(
                    pluginDescriptor.getPlugin(),
                    "\nThe plugin " + pluginDescriptor.getId() + " has unmet prerequisites: \n\t" + messages);
            prerequisiteExceptions.forEach(pie::addSuppressed);
            throw pie;
        }
    }

        this.executionRoot = executionRoot;
    }

    public String getDefaultGoal() {
        return getBuild() != null ? getBuild().getDefaultGoal() : null;
    }

    public Plugin getPlugin(String pluginKey) {
        org.apache.maven.api.model.Plugin plugin =
                getBuild().getDelegate().getPluginsAsMap().get(pluginKey);
        return plugin != null ? new Plugin(plugin, getBuild()) : null;

        // one by one, and try to find a matching prefix.
        if (result == null && build != null) {
            result = resolveFromProject(request, build.getPlugins());
            if (result == null && management != null) {
                result = resolveFromProject(request, management.getPlugins());
            }
        }

        if (result == null) {
            throw new NoPluginFoundForPrefixException(

            if (build != null) {
                validate20RawPlugins(problems, build.getPlugins(), "build.plugins.plugin.", EMPTY, request);

                PluginManagement mgmt = build.getPluginManagement();
                if (mgmt != null) {
                    validate20RawPlugins(
                            problems, mgmt.getPlugins(), "build.pluginManagement.plugins.plugin.", EMPTY, request);
                }
            }

                + "      </plugin>\n"
                + "    </plugins>\n"
                + "  </build>\n"
                + "</project>";

        Model model = fromXml(xml);
        Plugin plugin = model.getBuild().getPlugins().get(0);
        XmlNode node = plugin.getConfiguration();
        assertNotNull(node);
        assertEquals("http://maven.apache.org/POM/4.0.0", node.namespaceUri());
        assertEquals("m", node.prefix());

        // =============================================
        assertEquals("||${project.basedir}||", originalModel.getProperties().get("prop-outside"));

        List<Plugin> outsidePlugins = originalModel.getBuild().getPlugins();
        assertEquals(1, outsidePlugins.size());

        checkBuildPluginWithArtifactId(
                outsidePlugins,
                "plugin-all-profiles",
                "Outside ||${project.basedir}||",

        Build build = effectiveModel.getBuild();
        if (build != null) {
            // Check build/plugins - these are the actual plugins used in the build
            for (Plugin plugin : build.getPlugins()) {
                String pluginKey = getPluginKey(plugin);
                PluginUpgrade upgrade = pluginUpgrades.get(pluginKey);
                if (upgrade != null) {

            // pluginArtifacts
            Set<Artifact> pluginArtifacts = new HashSet<>();
            for (Plugin plugin : project.getModel().getDelegate().getBuild().getPlugins()) {
                Artifact artifact = repositorySystem.createPluginArtifact(new org.apache.maven.model.Plugin(plugin));

                if (artifact != null) {
                    pluginArtifacts.add(artifact);

    }

    /**
     * @return a Map of plugins field with {@code Plugins#getKey()} as key
     * @see Plugin#getKey()
     */
    public Map<String, Plugin> getPluginsAsMap() {
        return getPlugins().stream().collect(Collectors.toMap(plugin -> plugin.getKey(), plugin -> plugin));
    }
            ]]>
          </code>
        </codeSegment>
        <codeSegment>
          <version>4.1.0+</version>