Update to Drupal 8.1.2. For more information, see https://www.drupal.org/project/drupal/releases/8.1.2

core/modules/rdf/rdf.module

@@ -113,7 +113,7 @@ function rdf_get_namespaces() {
   // namespace, do not use \Drupal::moduleHandler()->invokeAll().
   foreach (\Drupal::moduleHandler()->getImplementations('rdf_namespaces') as $module) {
     $function = $module . '_rdf_namespaces';
-    foreach($function() as $prefix => $namespace) {
+    foreach ($function() as $prefix => $namespace) {
       if (array_key_exists($prefix, $namespaces) && $namespace !== $namespaces[$prefix]) {
         throw new Exception(t('Tried to map @prefix to @namespace, but @prefix is already mapped to @orig_namespace.', array('@prefix' => $prefix, '@namespace' => $namespace, '@orig_namespace' => $namespaces[$prefix])));
       }
@@ -233,9 +233,12 @@ function rdf_comment_storage_load($comments) {
     // to optimize performance for websites that implement an entity cache.
     $created_mapping = rdf_get_mapping('comment', $comment->bundle())
       ->getPreparedFieldMapping('created');
+    /** @var \Drupal\comment\CommentInterface $comment*/
     $comment->rdf_data['date'] = rdf_rdfa_attributes($created_mapping, $comment->get('created')->first()->toArray());
     $entity = $comment->getCommentedEntity();
-    $comment->rdf_data['entity_uri'] = $entity->url();
+    // The current function is a storage level hook, so avoid to bubble
+    // bubbleable metadata, because it can be outside of a render context.
+    $comment->rdf_data['entity_uri'] = $entity->toUrl()->toString(TRUE)->getGeneratedUrl();
     if ($comment->hasParentComment()) {
       $comment->rdf_data['pid_uri'] = $comment->getParentComment()->url();
     }
@@ -265,7 +268,7 @@ function rdf_preprocess_html(&$variables) {
   if (!isset($variables['html_attributes']['prefix'])) {
     $variables['html_attributes']['prefix'] = array();
   }
-  foreach(rdf_get_namespaces() as $prefix => $uri) {
+  foreach (rdf_get_namespaces() as $prefix => $uri) {
     $variables['html_attributes']['prefix'][] = $prefix . ': ' . $uri . " ";
   }
 }

core/modules/rdf/src/RdfMappingInterface.php

@@ -103,4 +103,5 @@ interface RdfMappingInterface extends ConfigEntityInterface {
    *   The RdfMapping object.
    */
   public function setFieldMapping($field_name, array $mapping = array());
+
 }

core/modules/rdf/src/SchemaOrgDataConverter.php

@@ -26,4 +26,5 @@ class SchemaOrgDataConverter {
     $interaction_type = $arguments['interaction_type'];
     return "$interaction_type:$count";
   }
+
 }

core/modules/rdf/src/Tests/CommentAttributesTest.php

@@ -372,4 +372,5 @@ class CommentAttributesTest extends CommentTestBase {
     $comment->save();
     return $comment;
   }
+
 }

core/modules/rdf/src/Tests/GetNamespacesTest.php

@@ -46,4 +46,5 @@ class GetNamespacesTest extends WebTestBase {
     ));
     $this->assertTrue(!empty($element), 'When a prefix has conflicting namespaces, the first declared one is used.');
   }
+
 }

core/modules/rdf/src/Tests/GetRdfNamespacesTest.php

@@ -40,4 +40,5 @@ class GetRdfNamespacesTest extends WebTestBase {
       $this->pass('Expected exception thrown: ' . $e->getMessage());
     }
   }
+
 }

core/modules/rdf/src/Tests/NodeAttributesTest.php

@@ -90,4 +90,5 @@ class NodeAttributesTest extends NodeTestBase {
     );
     $this->assertTrue($graph->hasProperty($node_uri, 'http://purl.org/dc/terms/created', $expected_value), 'Node date found in RDF output (dc:created).');
   }
+
 }

core/modules/rdf/src/Tests/StandardProfileTest.php

@@ -533,4 +533,5 @@ class StandardProfileTest extends WebTestBase {
     $parser->parse($graph, $this->drupalGet($url), 'rdfa', $this->baseUri);
     return $graph;
   }
+
 }

core/modules/rdf/src/Tests/TaxonomyAttributesTest.php

@@ -77,4 +77,5 @@ class TaxonomyAttributesTest extends TaxonomyTestBase {
     // @todo Add test for term description once it is a field:
     //   https://www.drupal.org/node/569434.
   }
+
 }

core/modules/rdf/src/Tests/UserAttributesTest.php

@@ -104,4 +104,5 @@ class UserAttributesTest extends WebTestBase {
 
     }
   }
+
 }

core/modules/rdf/tests/src/Kernel/CrudTest.php

@@ -107,4 +107,5 @@ class CrudTest extends KernelTestBase {
       ->getFieldMapping($field_name);
     $this->assertEqual($mapping, $field_mapping, 'Field mapping updated.');
   }
+
 }

core/modules/rdf/tests/src/Kernel/Field/DateTimeFieldRdfaTest.php

@@ -50,4 +50,5 @@ class DateTimeFieldRdfaTest extends FieldRdfaTestBase {
   public function testDefaultFormatter() {
     $this->assertFormatterRdfa(array('type' => 'datetime_default'), 'http://schema.org/dateCreated', array('value' => $this->testValue . 'Z', 'type' => 'literal', 'datatype' => 'http://www.w3.org/2001/XMLSchema#dateTime'));
   }
+
 }

core/modules/rdf/tests/src/Kernel/Field/EmailFieldRdfaTest.php

@@ -47,4 +47,5 @@ class EmailFieldRdfaTest extends FieldRdfaTestBase {
     // Test the mailto formatter.
     $this->assertFormatterRdfa(array('type' => 'email_mailto'), 'http://schema.org/email', array('value' => $this->testValue));
   }
+
 }

core/modules/rdf/tests/src/Kernel/Field/NumberFieldRdfaTest.php

@@ -200,4 +200,5 @@ class NumberFieldRdfaTest extends FieldRdfaTestBase {
     $this->entity = EntityTest::create(array());
     $this->entity->{$this->fieldName}->value = $testValue;
   }
+
 }

core/modules/rdf/tests/src/Kernel/Field/StringFieldRdfaTest.php

@@ -54,4 +54,5 @@ class StringFieldRdfaTest extends FieldRdfaTestBase {
     // Tests the string formatter.
     $this->assertFormatterRdfa(array('type' => 'string'), 'http://schema.org/text', array('value' => $this->testValue));
   }
+
 }

core/modules/rdf/tests/src/Kernel/Field/TelephoneFieldRdfaTest.php

@@ -65,4 +65,5 @@ class TelephoneFieldRdfaTest extends FieldRdfaTestBase {
     // Tests the telephone link formatter with custom title.
     $this->assertFormatterRdfa($formatter, 'http://schema.org/telephone', $expected_rdf_value);
   }
+
 }

core/modules/rdf/tests/src/Kernel/Field/TextFieldRdfaTest.php

@@ -69,4 +69,5 @@ class TextFieldRdfaTest extends FieldRdfaTestBase {
     // Tests the trimmed formatter.
     $this->assertFormatterRdfa(array('type' => 'text_trimmed'), 'http://schema.org/text', array('value' => $formatted_value));
   }
+
 }