return buildHierarchy(project.getRootProject(), realizeTasks);
    }

    /**
     * When {@code realizeTasks} is false, the project's task graph will not be realized, and the task list in the model will be empty
     */
    private static DefaultGradleProject buildHierarchy(Project project, boolean realizeTasks) {

----
=====
====
Executing the `gradle check` task should execute `verificationTask`, but with this example, it won't.
This is because the dependency between `verificationTask` and `check` only happens when `verificationTask` is realized.
To avoid issues like this, you must only modify the task associated with the configuration action.
Other tasks should be modified in their own configuration action:
+
====
[.multi-language-sample]
=====

                // Some tasks cannot declare the dependencies on other projects, yet, for example the dependencies task.
                // When configure on demand is enabled, those other projects are realized at execution time, long after the BuildOutputRegistry
                // has been finalized. We ignore those problems for now, until the dependencies can be declared properly.

                tasks.create(it.name)
            }
            toBeRealized.get()

            task verify {
                doLast {
                    assert tasks.findByName("realized") != null
                    assert tasks.findByName("toBeRealized") != null
                }
            }
        """

        expect:
        succeeds "verify"
    }

        output.contains("os: OperatingSystem 'os.windows'")
        output.contains("platform name: windows")
    }

    def "reference can have null value when parent model element is realized"() {
        when:
        buildScript '''
            @Managed
            interface Platform {
                String getDisplayName()
                void setDisplayName(String name)

        then:
        def ex = thrown(IllegalStateException)
        ex.message == "The domain object 'obj' (TestObject) for this provider is no longer present in its container."
    }

    def "can remove realized registered element using register provider"() {
        when:
        def provider = container.register('obj')
        def obj = provider.get()

        then:
        provider.present

        task(':build').originPlugin.displayName == "org.gradle.language.base.plugins.LifecycleBasePlugin"
    }

    def "reports task origin for lazily realized tasks"() {
        given:
        buildFile << """
            tasks.register('lazyTask') {
                doLast { println 'nothing to see here' }
            }
        """

        when:

    /**
     * Adds an {@code Action} to be executed when a task is added to this collection.
     * <p>
     * Like {@link #all(Action)}, this method will cause all tasks in this container to be realized.
     * </p>
     *
     * @param action The action to be executed
     * @return the supplied action
     */
    @SuppressWarnings("UnusedDeclaration")
    Action<? super T> whenTaskAdded(Action<? super T> action);

        this(filter.getType(), collection.filteredStore(filter), collection.filteredEvents(filter));
    }

    protected void realized(ProviderInternal<? extends T> provider) {
        getStore().realizeExternal(provider);
    }

    public Class<? extends T> getType() {
        return type;
    }

    protected ElementSource<T> getStore() {

 *     of the Java collection this collection property corresponds to</li>
 *     <li>{@link CollectingSupplier}, when the collection is still being added to - in that case,
 *     the collecting supplier will wrap a {@link Collector} that lazily represents the yet-to-be realized contents of the collection - see below for details</li>
 * </ul>
 *