diff --git a/core/modules/block/src/BlockViewBuilder.php b/core/modules/block/src/BlockViewBuilder.php
index 43bbdbf..c7106aa 100644
--- a/core/modules/block/src/BlockViewBuilder.php
+++ b/core/modules/block/src/BlockViewBuilder.php
@@ -85,7 +85,7 @@ public function viewMultiple(array $entities = array(), $view_mode = 'full', $la
           'entity_view',
           'block',
           $entity->id(),
-          $entity->langcode,
+          $entity->get('langcode'),
           // Blocks are always rendered in a "per theme" cache context.
           'cache_context.theme',
         );
diff --git a/core/modules/block_content/src/Tests/BlockContentTypeTest.php b/core/modules/block_content/src/Tests/BlockContentTypeTest.php
index fc20f0c..52e9191 100644
--- a/core/modules/block_content/src/Tests/BlockContentTypeTest.php
+++ b/core/modules/block_content/src/Tests/BlockContentTypeTest.php
@@ -67,7 +67,7 @@ public function testBlockContentTypeCreation() {
 
     // Check that the block type was created in site default language.
     $default_langcode = \Drupal::languageManager()->getDefaultLanguage()->id;
-    $this->assertEqual($block_type->langcode, $default_langcode);
+    $this->assertEqual($block_type->get('langcode'), $default_langcode);
   }
 
   /**
diff --git a/core/modules/config/src/Tests/ConfigEntityTest.php b/core/modules/config/src/Tests/ConfigEntityTest.php
index 4a1bd1b..c154d99 100644
--- a/core/modules/config/src/Tests/ConfigEntityTest.php
+++ b/core/modules/config/src/Tests/ConfigEntityTest.php
@@ -49,7 +49,7 @@ function testCRUD() {
     $this->assertTrue($empty->uuid);
     $this->assertIdentical($empty->label, NULL);
     $this->assertIdentical($empty->style, NULL);
-    $this->assertIdentical($empty->langcode, $default_langcode);
+    $this->assertIdentical($empty->get('langcode'), $default_langcode);
 
     // Verify ConfigEntity properties/methods on the newly created empty entity.
     $this->assertIdentical($empty->isNew(), TRUE);
@@ -108,7 +108,7 @@ function testCRUD() {
     $this->assertNotEqual($config_test->uuid, $empty->uuid);
     $this->assertIdentical($config_test->label, $expected['label']);
     $this->assertIdentical($config_test->style, $expected['style']);
-    $this->assertIdentical($config_test->langcode, $default_langcode);
+    $this->assertIdentical($config_test->get('langcode'), $default_langcode);
 
     // Verify methods on the newly created entity.
     $this->assertIdentical($config_test->isNew(), TRUE);
diff --git a/core/modules/filter/src/Tests/FilterCrudTest.php b/core/modules/filter/src/Tests/FilterCrudTest.php
index b592c5f..fe8d2cf 100644
--- a/core/modules/filter/src/Tests/FilterCrudTest.php
+++ b/core/modules/filter/src/Tests/FilterCrudTest.php
@@ -92,7 +92,7 @@ function verifyTextFormat($format) {
     $this->assertEqual($filter_format->name, $format->name, format_string('filter_format_load: Proper title for text format %format.', $t_args));
     $this->assertEqual($filter_format->weight, $format->weight, format_string('filter_format_load: Proper weight for text format %format.', $t_args));
     // Check that the filter was created in site default language.
-    $this->assertEqual($format->langcode, $default_langcode, format_string('filter_format_load: Proper language code for text format %format.', $t_args));
+    $this->assertEqual($format->get('langcode'), $default_langcode, format_string('filter_format_load: Proper language code for text format %format.', $t_args));
   }
 
 }
diff --git a/core/modules/image/image.module b/core/modules/image/image.module
index c951dcf..2598f91 100644
--- a/core/modules/image/image.module
+++ b/core/modules/image/image.module
@@ -419,12 +419,12 @@ function image_field_config_update(FieldConfigInterface $field) {
     if ($file_new) {
       $file_new->status = FILE_STATUS_PERMANENT;
       $file_new->save();
-      \Drupal::service('file.usage')->add($file_new, 'image', 'default_image', $field->uuid);
+      \Drupal::service('file.usage')->add($file_new, 'image', 'default_image', $field->uuid());
     }
 
     // Is there an old file?
     if ($fid_old && ($file_old = file_load($fid_old))) {
-      \Drupal::service('file.usage')->delete($file_old, 'image', 'default_image', $field->uuid);
+      \Drupal::service('file.usage')->delete($file_old, 'image', 'default_image', $field->uuid());
     }
   }
 
@@ -458,11 +458,11 @@ function image_field_instance_config_update(FieldInstanceConfigInterface $field_
     if ($file_new) {
       $file_new->status = FILE_STATUS_PERMANENT;
       $file_new->save();
-      \Drupal::service('file.usage')->add($file_new, 'image', 'default_image', $field_instance->uuid);
+      \Drupal::service('file.usage')->add($file_new, 'image', 'default_image', $field_instance->uuid());
     }
     // Delete the old file, if present.
     if ($fid_old && ($file_old = file_load($fid_old))) {
-      \Drupal::service('file.usage')->delete($file_old, 'image', 'default_image', $field_instance->uuid);
+      \Drupal::service('file.usage')->delete($file_old, 'image', 'default_image', $field_instance->uuid());
     }
   }
 
@@ -486,7 +486,7 @@ function image_field_config_delete(FieldConfigInterface $field) {
   // The value of a managed_file element can be an array if #extended == TRUE.
   $fid = $field->settings['default_image']['fid'];
   if ($fid && ($file = file_load($fid))) {
-    \Drupal::service('file.usage')->delete($file, 'image', 'default_image', $field->uuid);
+    \Drupal::service('file.usage')->delete($file, 'image', 'default_image', $field->uuid());
   }
 }
 
@@ -505,6 +505,6 @@ function image_field_instance_config_delete(FieldInstanceConfigInterface $field_
 
   // Remove the default image when the instance is deleted.
   if ($fid && ($file = file_load($fid))) {
-    \Drupal::service('file.usage')->delete($file, 'image', 'default_image', $field_instance->uuid);
+    \Drupal::service('file.usage')->delete($file, 'image', 'default_image', $field_instance->uuid());
   }
 }
diff --git a/core/modules/menu_link/src/MenuLinkForm.php b/core/modules/menu_link/src/MenuLinkForm.php
index 6eee313..3d4e774 100644
--- a/core/modules/menu_link/src/MenuLinkForm.php
+++ b/core/modules/menu_link/src/MenuLinkForm.php
@@ -174,7 +174,7 @@ public function form(array $form, array &$form_state) {
     // Without Language module menu links inherit the menu language and no
     // language selector is shown.
     else {
-      $default_langcode = ($menu_link->isNew() ? entity_load('menu', $menu_link->menu_name)->langcode : $menu_link->langcode);
+      $default_langcode = ($menu_link->isNew() ? entity_load('menu', $menu_link->menu_name)->get('langcode') : $menu_link->langcode);
       $language_show = FALSE;
     }
 
diff --git a/core/modules/system/src/Form/DateFormatFormBase.php b/core/modules/system/src/Form/DateFormatFormBase.php
index b528edb..2a540d0 100644
--- a/core/modules/system/src/Form/DateFormatFormBase.php
+++ b/core/modules/system/src/Form/DateFormatFormBase.php
@@ -147,7 +147,7 @@ public function form(array $form, array &$form_state) {
       '#type' => 'language_select',
       '#title' => t('Language'),
       '#languages' => LanguageInterface::STATE_ALL,
-      '#default_value' => $this->entity->langcode,
+      '#default_value' => $this->entity->get('langcode'),
     );
 
     return parent::form($form, $form_state);
diff --git a/core/modules/taxonomy/src/VocabularyForm.php b/core/modules/taxonomy/src/VocabularyForm.php
index 7287055..8e3b10d 100644
--- a/core/modules/taxonomy/src/VocabularyForm.php
+++ b/core/modules/taxonomy/src/VocabularyForm.php
@@ -58,7 +58,7 @@ public function form(array $form, array &$form_state) {
       '#type' => 'language_select',
       '#title' => $this->t('Vocabulary language'),
       '#languages' => LanguageInterface::STATE_ALL,
-      '#default_value' => $vocabulary->langcode,
+      '#default_value' => $vocabulary->get('langcode'),
     );
     if ($this->moduleHandler->moduleExists('language')) {
       $form['default_terms_language'] = array(
diff --git a/core/modules/user/src/Tests/UserRoleAdminTest.php b/core/modules/user/src/Tests/UserRoleAdminTest.php
index 0ddfa73..a7e4fdf 100644
--- a/core/modules/user/src/Tests/UserRoleAdminTest.php
+++ b/core/modules/user/src/Tests/UserRoleAdminTest.php
@@ -52,7 +52,7 @@ function testRoleAdministration() {
     $this->assertTrue(is_object($role), 'The role was successfully retrieved from the database.');
 
     // Check that the role was created in site default language.
-    $this->assertEqual($role->langcode, $default_langcode);
+    $this->assertEqual($role->get('langcode'), $default_langcode);
 
     // Try adding a duplicate role.
     $this->drupalPostForm('admin/people/roles/add', $edit, t('Save'));