* Sets the root artifact for the dependency graph.
         * This must not be confused with {@link #root(DependencyCoordinate)}: The root dependency, like any
         * other specified dependency, will be subject to dependency collection/resolution, i.e. should have an artifact
         * descriptor and a corresponding artifact file. The root artifact on the other hand is only used

    /**
     * Wraps an object, providing reflective access to the object graph of which the
     * supplied object is the root. Expressions like 'child.name' will translate into
     * 'rootObject.getChild().getName()' for non-boolean properties, and
     * 'rootObject.getChild().isName()' for boolean properties.
     */
    public static class ObjectBasedValueSource extends AbstractValueSource {

        private final Object root;

        /**

        ArtifactSpec e = b2.addDependency("e", "1.0");
        ArtifactSpec g = d1.addDependency("g", "1.0");

        ArtifactResolutionResult res = collect(createSet(new Object[] {a.artifact}));
        Object[] artifacts = new Object[] {a.artifact, c.artifact, d1.artifact, b2.artifact, e.artifact, g.artifact};
        assertEquals(createSet(artifacts), res.getArtifacts(), "Check artifact list");

org/apache/maven/plugin/AbstractMojoExecutio.class package org.apache.maven.plugin; public abstract synchronized class AbstractMojoExecutio extends Exception { protected Object source; protected String longMessage; public void AbstractMojoExecutio(String); public void AbstractMojoExecutio(String, Throwable); public String getLongMessage(); public Object getSource(); } org/apache/maven/plugin/ContextEnabled.class package org.apache.maven.plugin; public abstract interface ContextEnabled { public abstract void ...

                    e);
        }

        if (mojo instanceof ContextEnabled) {
            MavenProject project = session.getCurrentProject();

            Map<String, Object> pluginContext = session.getPluginContext(pluginDescriptor, project);

            if (pluginContext != null) {
                pluginContext.put("project", project);

            return nullify(metadata.getVersion());
        }

        private String nullify(String str) {
            return (str == null || str.isEmpty()) ? null : str;
        }

        public Object getKey() {
            return metadata.toString();
        }

        public String getRemoteFilename() {
            return metadata.getType();
        }

                    return;
                }
                // No module descriptor, check manifest file.
                Manifest mf = jar.getManifest();
                if (mf != null) {
                    Object name = mf.getMainAttributes().get(AUTO_MODULE_NAME);
                    if (name instanceof String) {
                        descriptors = Collections.singletonMap(path, (String) name);

        }

        @Override
        public void init(Context context) throws Exception {}

        @Override
        @SuppressWarnings("checkstyle:MissingSwitchDefault")
        public void onEvent(Object event) throws Exception {
            if (event instanceof ExecutionEvent) {
                ReactorReader reactorReader = lookup.lookup(ReactorReader.class);
                reactorReader.processEvent((ExecutionEvent) event);

     *
     * @throws org.apache.maven.api.services.MavenException if not called from the within a mojo execution
     */
    @Nonnull
    Map<String, Object> getPluginContext(@Nonnull Project project);

    /**
     * Retrieves the service for the interface
     *
     * @throws NoSuchElementException if the service could not be found
     */
    @Nonnull

    @Test
    public void testPluginDescriptorExpressionReference() throws Exception {
        Session session = newSession();
        MojoExecution exec = newMojoExecution(session);

        Object result =
                new PluginParameterExpressionEvaluatorV4(session, null, exec).evaluate("${mojo.plugin.descriptor}");

        System.out.println("Result: " + result);

        assertSame(