Adding orm: and mongodb: annotation aliases to avoid conflicts. Recommended is to use the aliases instead of relying on the default namespace for annotations.

/** @orm:Entity */
/** @mongodb:Document */

src/Symfony/Bundle/DoctrineBundle/Resources/config/orm.xml

@@ -45,6 +45,11 @@
         <service id="doctrine.orm.metadata_driver.annotation" class="Doctrine\ORM\Mapping\Driver\AnnotationDriver">
             <argument type="service" id="doctrine.orm.metadata_driver.annotation.reader" />
             <argument>%doctrine.orm.metadata_driver.entity_dirs%</argument>
+            <call method="setDefaultAnnotationNamespace"><argument>%doctrine.orm.metadata.annotation_default_namespace%</argument></call>
+            <call method="setAnnotationNamespaceAlias">
+              <argument>Doctrine\ORM\Mapping\</argument>
+              <argument>orm</argument>
+            </call>
         </service>
 
         <service id="doctrine.orm.metadata_driver.annotation.reader" class="Doctrine\Common\Annotations\AnnotationReader">

src/Symfony/Bundle/DoctrineMongoDBBundle/Resources/config/mongodb.xml

@@ -57,6 +57,10 @@
     <service id="doctrine.odm.mongodb.metadata.annotation_reader" class="%doctrine.odm.mongodb.metadata.annotation_reader_class%">
       <argument type="service" id="doctrine.odm.mongodb.cache" />
       <call method="setDefaultAnnotationNamespace"><argument>%doctrine.odm.mongodb.metadata.annotation_default_namespace%</argument></call>
+      <call method="setAnnotationNamespaceAlias">
+        <argument>Doctrine\ODM\MongoDB\Mapping\</argument>
+        <argument>mongodb</argument>
+      </call>
     </service>
     <service id="doctrine.odm.mongodb.metadata.xml" class="%doctrine.odm.mongodb.metadata.xml_class%"><argument>%doctrine.odm.mongodb.xml_mapping_dirs%</argument></service>
     <service id="doctrine.odm.mongodb.metadata.yml" class="%doctrine.odm.mongodb.metadata.yml_class%"><argument>%doctrine.odm.mongodb.yml_mapping_dirs%</argument></service>