diff -u b/core/modules/aggregator/lib/Drupal/aggregator/FeedInterface.php b/core/modules/aggregator/lib/Drupal/aggregator/FeedInterface.php
--- b/core/modules/aggregator/lib/Drupal/aggregator/FeedInterface.php
+++ b/core/modules/aggregator/lib/Drupal/aggregator/FeedInterface.php
@@ -21,7 +21,7 @@
    * @param string $title
    *   A string containing the title of the feed.
    *
-   * @return \Drupal\comment\CommentInterface|null
+   * @return \Drupal\aggregator\FeedInterface
    *   The class instance that this method is called on.
    */
   public function setTitle($title);
@@ -40,7 +40,7 @@
    * @param string $langcode.
    *   A string containing the langcode of the feed.
    *
-   * @return \Drupal\aggregator\Plugin\Core\Entity\FeedInterface|null
+   * @return \Drupal\aggregator\FeedInterface
    *   The class instance that this method is called on.
    */
   public function setLangcode($langcode);
@@ -61,7 +61,7 @@
    * @param string $url
    *   A string containing the url of the feed.
    *
-   * @return \Drupal\aggregator\Plugin\Core\Entity\FeedInterface|null
+   * @return \Drupal\aggregator\FeedInterface
    *   The class instance that this method is called on.
    */
   public function setUrl($url);
@@ -81,7 +81,7 @@
    * @param int $refresh
    *   The refresh rate of the feed.
    *
-   * @return \Drupal\aggregator\Plugin\Core\Entity\FeedInterface|null
+   * @return \Drupal\aggregator\FeedInterface
    *   The class instance that this method is called on.
    */
   public function setRefresh($refresh);
@@ -101,7 +101,7 @@
    * @param int $checked
    *   A int with the time of the last refresh.
    *
-   * @return \Drupal\aggregator\Plugin\Core\Entity\FeedInterface|null
+   * @return \Drupal\aggregator\FeedInterface
    *   The class instance that this method is called on.
    */
   public function setChecked($checked);
@@ -121,7 +121,7 @@
    * @param int $queued
    *    A int with the time of the last refresh.
    *
-   * @return \Drupal\aggregator\Plugin\Core\Entity\FeedInterface|null
+   * @return \Drupal\aggregator\FeedInterface
    *   The class instance that this method is called on.
    */
   public function setQueued($queued);
@@ -141,7 +141,7 @@
    * @param string $link
    *   A string containing the parent website of the feed.
    *
-   * @return \Drupal\aggregator\Plugin\Core\Entity\FeedInterface|null
+   * @return \Drupal\aggregator\FeedInterface
    *   The class instance that this method is called on.
    */
   public function setLink($link);
@@ -160,7 +160,7 @@
    * @param string $description
    *   A string containing the langcode of the feed.
    *
-   * @return \Drupal\aggregator\Plugin\Core\Entity\FeedInterface|null
+   * @return \Drupal\aggregator\FeedInterface
    *   The class instance that this method is called on.
    */
   public function setDescription($description);
@@ -179,7 +179,7 @@
    * @param string $image
    *   A string containing the langcode of the feed.
    *
-   * @return \Drupal\aggregator\Plugin\Core\Entity\FeedInterface|null
+   * @return \Drupal\aggregator\FeedInterface
    *   The class instance that this method is called on.
    */
   public function setImage($image);
@@ -199,7 +199,7 @@
    * @param string $hash
    *   A string containing the calculated hash of the feed.
    *
-   * @return \Drupal\aggregator\Plugin\Core\Entity\FeedInterface|null
+   * @return \Drupal\aggregator\FeedInterface
    *   The class instance that this method is called on.
    */
   public function setHash($hash);
@@ -218,7 +218,7 @@
    * @param string $etag
    *   A string containing the Entity tag HTTP response header.
    *
-   * @return \Drupal\aggregator\Plugin\Core\Entity\FeedInterface|null
+   * @return \Drupal\aggregator\FeedInterface
    *   The class instance that this method is called on.
    */
   public function setEtag($etag);
@@ -238,7 +238,7 @@
    * @param int $modified
    *   A string containing the modification of the feed.
    *
-   * @return \Drupal\aggregator\Plugin\Core\Entity\FeedInterface|null
+   * @return \Drupal\aggregator\FeedInterface
    *   The class instance that this method is called on.
    */
   public function setModified($modified);
@@ -257,7 +257,7 @@
    * @param int $block
    *   A int containing the Number of items to display in the feed’s block.
    *
-   * @return \Drupal\aggregator\Plugin\Core\Entity\FeedInterface|null
+   * @return \Drupal\aggregator\FeedInterface
    *   The class instance that this method is called on.
    */
   public function setBlock($block);
diff -u b/core/modules/aggregator/lib/Drupal/aggregator/Plugin/Core/Entity/Feed.php b/core/modules/aggregator/lib/Drupal/aggregator/Plugin/Core/Entity/Feed.php
--- b/core/modules/aggregator/lib/Drupal/aggregator/Plugin/Core/Entity/Feed.php
+++ b/core/modules/aggregator/lib/Drupal/aggregator/Plugin/Core/Entity/Feed.php
@@ -41,13 +41,6 @@
 class Feed extends EntityNG implements FeedInterface {
 
   /**
-   * Overrides Drupal\Core\Entity\EntityNG::init().
-   */
-  public function init() {
-    parent::init();
-  }
-
-  /**
    * Implements Drupal\Core\Entity\EntityInterface::id().
    */
   public function id() {
@@ -148,8 +141,6 @@
     }
   }
 
-
-
   /**
    * {@inheritdoc}
    */