How do I programmatically generate an entity form? I need to programmatically generate the entity form for my custom entity - basically get the same output that happens when you call 

\Drupal::formBuilder()-&gt;getForm('form namespace')


When I try to do that with my entity form I get the error:

Call to a member function getEntityTypeId() on null in Drupal\Core\Entity\EntityForm-&gt;getBaseFormId() (line 77 of core/lib/Drupal/Core/Entity/EntityForm.php).


Really stumped on how to proceed.



Here's an obfuscated version of code I'm using

Entity Definition:

/**
 * Defines the My Entity entity.
 *
 * @ingroup my_module
 *
 * @ContentEntityType(
 *   id = "my_entity",
 *   label = @Translation("My Entity"),
 *   handlers = {
 *     "view_builder" = "Drupal\Core\Entity\EntityViewBuilder",
 *     "list_builder" = "Drupal\my_module\MyEntityListBuilder",
 *     "views_data" = "Drupal\my_module\Entity\MyEntityViewsData",
 *     "translation" = "Drupal\my_module\MyEntityTranslationHandler",
 *
 *     "form" = {
 *       "default" = "Drupal\my_module\Form\MyEntityForm",
 *       "add" = "Drupal\my_module\Form\MyEntityForm",
 *       "edit" = "Drupal\my_module\Form\MyEntityForm",
 *       "delete" = "Drupal\my_module\Form\MyEntityDeleteForm",
 *     },
 *     "access" = "Drupal\my_module\MyEntityAccessControlHandler",
 *     "route_provider" = {
 *       "html" = "Drupal\my_module\MyEntityHtmlRouteProvider",
 *     },
 *   },
 *   base_table = "my_entity",
 *   data_table = "my_entity_field_data",
 *   translatable = TRUE,
 *   admin_permission = "administer as my_entity entities",
 *   entity_keys = {
 *     "id" = "id",
 *     "label" = "name",
 *     "uuid" = "uuid",
 *     "uid" = "user_id",
 *     "langcode" = "langcode",
 *     "status" = "status",
 *   },
 *   links = {
 *     "canonical" = "/admin/structure/my_entity/{my_entity}",
 *     "add-form" = "/admin/structure/my_entity/add",
 *     "edit-form" = "/admin/structure/my_entity/{my_entity}/edit",
 *     "delete-form" = "/admin/structure/my_entity/{my_entity}/delete",
 *     "collection" = "/admin/structure/my_entity",
 *   },
 *   field_ui_base_route = "my_entity.settings",
 *   constraints = {
 *     "CustomContraint" = {}
 *   }
 * )
 */
class MyEntity extends ContentEntityBase implements MyEntityInterface {


Form namespace

namespace Drupal\my_module\Form;

use Drupal\Core\Entity\ContentEntityForm;
use Drupal\Core\Form\FormStateInterface;

/**
 * Form controller for My Entity edit forms.
 *
 * @ingroup my_module
 */
class MyEntityForm extends ContentEntityForm {




Okay, so this is what I've found so far. User oknate's answer partially works; I also had to add a dummy function to my container form class to get around a callback error, which looked like this:

 public function processForm($element, FormStateInterface $form_state, $form)
  {
    return $element;
  }


This is probably not the right way to do this, but it does result in a form object that will render in another form.
You can use the entity form builder service.  I was able to load the user form this way (with $entity being the current user):

$entity = User::load($uid);
$user_form = \Drupal::service('entity.form_builder')-&gt;getForm($entity, 'default');


If you want to get the user register form (which is basically an entity form without a saved entity), you can just use the create method on your entity class before passing it to the form:

$entity = User::create();
$user_form = \Drupal::service('entity.form_builder')-&gt;getForm($entity, 'default');