several fatal error when an entity content generated is referenced from an other entity, or an entity content is referencing other entity

Playing with drupal 8 entities, I noticed theses errors with the entity class generated :

1- When you use an entity content generated and trying to reference this entity (with an entity_reference field) from an another entity (let's say Article content type).

When you try to add a new article, you've got this fatal error.

Drupal\Core\Entity\Exception\UndefinedLinkTemplateException: No link template "canonical" found for the "note" entity type in Drupal\Core\Entity\Entity->urlInfo() (line 188 of /srv/www/drupal8/core/lib/Drupal/Core/Entity/Entity.php).

It's because the canonical link is missing in the annotations of the entity

2- If you reference an another entity from the entity content generated (always with an entity_reference field), you've got this fatal error when trying to add the entity_reference field.

InvalidArgumentException: Field user_id is unknown. in Drupal\Core\Entity\ContentEntityBase->getTranslatedField() (line 339 of /srv/www/drupal8/core/lib/Drupal/Core/Entity/ContentEntityBase.php).

It's because all the functions about the owner in the Entity Class assume there is a field user_id which handle the author feature. But this field is not created in the baseFieldDefinitions.