diff --git a/lib/Doctrine/ORM/Persisters/AbstractCollectionPersister.php b/lib/Doctrine/ORM/Persisters/AbstractCollectionPersister.php
index a541e3b6b..a23721f31 100644
--- a/lib/Doctrine/ORM/Persisters/AbstractCollectionPersister.php
+++ b/lib/Doctrine/ORM/Persisters/AbstractCollectionPersister.php
@@ -19,9 +19,7 @@
 
 namespace Doctrine\ORM\Persisters;
 
-use Doctrine\Common\Collections\Criteria;
 use Doctrine\ORM\EntityManager;
-use Doctrine\ORM\PersistentCollection;
 
 /**
  * Base class for all collection persisters.
@@ -73,76 +71,4 @@ abstract class AbstractCollectionPersister implements CollectionPersister
         $this->platform         = $this->conn->getDatabasePlatform();
         $this->quoteStrategy    = $em->getConfiguration()->getQuoteStrategy();
     }
-
-    /**
-     * {@inheritdoc}
-     */
-    public function delete(PersistentCollection $coll)
-    {
-        throw new \BadMethodCallException("Deleting elements is not supported by this CollectionPersister.");
-    }
-
-    /**
-     * {@inheritdoc}
-     */
-    public function count(PersistentCollection $coll)
-    {
-        throw new \BadMethodCallException("Counting the size of this persistent collection is not supported by this CollectionPersister.");
-    }
-
-    /**
-     * {@inheritdoc}
-     */
-    public function slice(PersistentCollection $coll, $offset, $length = null)
-    {
-        throw new \BadMethodCallException("Slicing elements is not supported by this CollectionPersister.");
-    }
-
-    /**
-     * {@inheritdoc}
-     */
-    public function contains(PersistentCollection $coll, $element)
-    {
-        throw new \BadMethodCallException("Checking for existence of an element is not supported by this CollectionPersister.");
-    }
-
-    /**
-     * {@inheritdoc}
-     */
-    public function containsKey(PersistentCollection $coll, $key)
-    {
-        throw new \BadMethodCallException("Checking for existence of a key is not supported by this CollectionPersister.");
-    }
-
-    /**
-     * {@inheritdoc}
-     */
-    public function removeElement(PersistentCollection $coll, $element)
-    {
-        throw new \BadMethodCallException("Removing an element is not supported by this CollectionPersister.");
-    }
-
-    /**
-     * {@inheritdoc}
-     */
-    public function removeKey(PersistentCollection $coll, $key)
-    {
-        throw new \BadMethodCallException("Removing a key is not supported by this CollectionPersister.");
-    }
-
-    /**
-     * {@inheritdoc}
-     */
-    public function get(PersistentCollection $coll, $index)
-    {
-        throw new \BadMethodCallException("Selecting a collection by index is not supported by this CollectionPersister.");
-    }
-
-    /**
-     * {@inheritdoc}
-     */
-    public function loadCriteria(PersistentCollection $coll, Criteria $criteria)
-    {
-        throw new \BadMethodCallException("Filtering a collection by Criteria is not supported by this CollectionPersister.");
-    }
 }
diff --git a/lib/Doctrine/ORM/Persisters/CollectionPersister.php b/lib/Doctrine/ORM/Persisters/CollectionPersister.php
index d2ad2e4da..855b85a30 100644
--- a/lib/Doctrine/ORM/Persisters/CollectionPersister.php
+++ b/lib/Doctrine/ORM/Persisters/CollectionPersister.php
@@ -100,16 +100,6 @@ interface CollectionPersister
      */
     public function removeElement(PersistentCollection $collection, $element);
 
-    /**
-     * Removes an element by key.
-     *
-     * @param \Doctrine\ORM\PersistentCollection $collection
-     * @param mixed                              $key
-     *
-     * @return void
-     */
-    public function removeKey(PersistentCollection $collection, $key);
-
     /**
      * Gets an element by key.
      *
diff --git a/lib/Doctrine/ORM/Persisters/ManyToManyPersister.php b/lib/Doctrine/ORM/Persisters/ManyToManyPersister.php
index 6ab3fc3d9..f671d8921 100644
--- a/lib/Doctrine/ORM/Persisters/ManyToManyPersister.php
+++ b/lib/Doctrine/ORM/Persisters/ManyToManyPersister.php
@@ -60,21 +60,26 @@ class ManyToManyPersister extends AbstractCollectionPersister
             return; // ignore inverse side
         }
 
-        $diff   = $coll->getDeleteDiff();
-        $sql    = $this->getDeleteRowSQL($coll);
+        $insertSql = $this->getInsertRowSQL($coll);
+        $deleteSql = $this->getDeleteRowSQL($coll);
 
-        foreach ($diff as $element) {
-            $this->conn->executeUpdate($sql, $this->getDeleteRowSQLParameters($coll, $element));
+        foreach ($coll->getDeleteDiff() as $element) {
+            $this->conn->executeUpdate($deleteSql, $this->getDeleteRowSQLParameters($coll, $element));
         }
 
-        $diff   = $coll->getInsertDiff();
-        $sql    = $this->getInsertRowSQL($coll);
-
-        foreach ($diff as $element) {
-            $this->conn->executeUpdate($sql, $this->getInsertRowSQLParameters($coll, $element));
+        foreach ($coll->getInsertDiff() as $element) {
+            $this->conn->executeUpdate($insertSql, $this->getInsertRowSQLParameters($coll, $element));
         }
     }
 
+    /**
+     * {@inheritdoc}
+     */
+    public function get(PersistentCollection $coll, $index)
+    {
+        throw new \BadMethodCallException("Selecting a collection by index is not supported by this CollectionPersister.");
+    }
+
     /**
      * {@inheritdoc}
      */
diff --git a/lib/Doctrine/ORM/Persisters/OneToManyPersister.php b/lib/Doctrine/ORM/Persisters/OneToManyPersister.php
index 5586bd99a..5727111a1 100644
--- a/lib/Doctrine/ORM/Persisters/OneToManyPersister.php
+++ b/lib/Doctrine/ORM/Persisters/OneToManyPersister.php
@@ -214,4 +214,12 @@ class OneToManyPersister extends AbstractCollectionPersister
 
         return $persister->delete($element);
     }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function loadCriteria(PersistentCollection $collection, Criteria $criteria)
+    {
+        throw new \BadMethodCallException("Filtering a collection by Criteria is not supported by this CollectionPersister.");
+    }
 }