diff --git a/lib/Doctrine/ORM/Mapping/Driver/XmlDriver.php b/lib/Doctrine/ORM/Mapping/Driver/XmlDriver.php
index d1dd4e7cb..be4ba8d77 100644
--- a/lib/Doctrine/ORM/Mapping/Driver/XmlDriver.php
+++ b/lib/Doctrine/ORM/Mapping/Driver/XmlDriver.php
@@ -148,12 +148,16 @@ class XmlDriver extends AbstractFileDriver
                 }
                 
                 if (isset($fieldMapping['unique'])) {
-                  $mapping['unique'] = (bool)$fieldMapping['unique'];
+                    $mapping['unique'] = ((string)$fieldMapping['unique'] == "false") ? false : true;
                 }
                 
                 if (isset($fieldMapping['options'])) {
                     $mapping['options'] = (array)$fieldMapping['options'];
                 }
+
+                if (isset($fieldMapping['nullable'])) {
+                    $mapping['nullable'] = ((string)$fieldMapping['nullable'] == "false") ? false : true;
+                }
                 
                 if (isset($fieldMapping['version']) && $fieldMapping['version']) {
                     $metadata->setVersionMapping($mapping);
@@ -407,11 +411,11 @@ class XmlDriver extends AbstractFileDriver
         );
         
         if (isset($joinColumnElement['unique'])) {
-            $joinColumn['unique'] = (bool)$joinColumnElement['unique'];
+            $joinColumn['unique'] = ((string)$joinColumnElement['unique'] == "false") ? false : true;
         }
         
         if (isset($joinColumnElement['nullable'])) {
-            $joinColumn['nullable'] = (bool)$joinColumnElement['nullable'];
+            $joinColumn['nullable'] = ((string)$joinColumnElement['nullable'] == "false") ? false : true;
         }
         
         if (isset($joinColumnElement['onDelete'])) {
diff --git a/tests/Doctrine/Tests/ORM/Mapping/MappingDriverTest.php b/tests/Doctrine/Tests/ORM/Mapping/MappingDriverTest.php
index cce7c6dbf..b2c9ae9cb 100644
--- a/tests/Doctrine/Tests/ORM/Mapping/MappingDriverTest.php
+++ b/tests/Doctrine/Tests/ORM/Mapping/MappingDriverTest.php
@@ -50,7 +50,7 @@ class MappingDriverTest extends \Doctrine\Tests\OrmTestCase
         $this->assertEquals(1, count($classNames));
     }
     
-    private function _testUserClassMapping($class)
+    private function _testUserClassMapping(ClassMetadata $class)
     {        
         $this->assertEquals('cms_users', $class->getTableName());
         $this->assertEquals(ClassMetadata::INHERITANCE_TYPE_NONE, $class->getInheritanceType());
@@ -58,6 +58,8 @@ class MappingDriverTest extends \Doctrine\Tests\OrmTestCase
         $this->assertTrue(isset($class->fieldMappings['id']));
         $this->assertTrue(isset($class->fieldMappings['name']));
         $this->assertEquals('string', $class->fieldMappings['name']['type']);
+        $this->assertTrue($class->fieldMappings['name']['nullable']);
+        $this->assertTrue($class->fieldMappings['name']['unique']);
         $this->assertEquals(array('id'), $class->identifier);
         $this->assertEquals(ClassMetadata::GENERATOR_TYPE_AUTO, $class->getIdGeneratorType());
         
@@ -92,6 +94,10 @@ class MappingDriverTest extends \Doctrine\Tests\OrmTestCase
         $this->assertTrue($class->associationMappings['groups']->isCascadeRefresh);
         $this->assertTrue($class->associationMappings['groups']->isCascadeDetach);
         $this->assertTrue($class->associationMappings['groups']->isCascadeMerge);
+
+        // Non-Nullability of Join Column
+        $this->assertFalse($class->associationMappings['groups']->joinTable['joinColumns'][0]['nullable']);
+        $this->assertFalse($class->associationMappings['groups']->joinTable['joinColumns'][0]['unique']);
     }
 }
 
diff --git a/tests/Doctrine/Tests/ORM/Mapping/xml/Doctrine.Tests.ORM.Mapping.User.dcm.xml b/tests/Doctrine/Tests/ORM/Mapping/xml/Doctrine.Tests.ORM.Mapping.User.dcm.xml
index 932b8cc3b..5d6c68c74 100644
--- a/tests/Doctrine/Tests/ORM/Mapping/xml/Doctrine.Tests.ORM.Mapping.User.dcm.xml
+++ b/tests/Doctrine/Tests/ORM/Mapping/xml/Doctrine.Tests.ORM.Mapping.User.dcm.xml
@@ -16,7 +16,7 @@
             <generator strategy="AUTO"/>
         </id>
         
-        <field name="name" column="name" type="string" length="50"/>
+        <field name="name" column="name" type="string" length="50" nullable="true" unique="true" />
         
         <one-to-one field="address" target-entity="Address">
             <join-column name="address_id" referenced-column-name="id"/>
@@ -34,7 +34,7 @@
         <many-to-many field="groups" target-entity="Group">
             <join-table name="cms_users_groups">
                 <join-columns>
-                    <join-column name="user_id" referenced-column-name="id"/>
+                    <join-column name="user_id" referenced-column-name="id" nullable="false" unique="false" />
                 </join-columns>
                 <inverse-join-columns>
                     <join-column name="group_id" referenced-column-name="id"/>
diff --git a/tests/Doctrine/Tests/ORM/Mapping/yaml/Doctrine.Tests.ORM.Mapping.User.dcm.yml b/tests/Doctrine/Tests/ORM/Mapping/yaml/Doctrine.Tests.ORM.Mapping.User.dcm.yml
index c29e6c908..501a0d3b0 100644
--- a/tests/Doctrine/Tests/ORM/Mapping/yaml/Doctrine.Tests.ORM.Mapping.User.dcm.yml
+++ b/tests/Doctrine/Tests/ORM/Mapping/yaml/Doctrine.Tests.ORM.Mapping.User.dcm.yml
@@ -10,6 +10,8 @@ Doctrine\Tests\ORM\Mapping\User:
     name:
       type: string
       length: 50
+      nullable: true
+      unique: true
   oneToOne:
     address:
       targetEntity: Address
@@ -30,6 +32,8 @@ Doctrine\Tests\ORM\Mapping\User:
         joinColumns:
           user_id:
             referencedColumnName: id
+            nullable: false
+            unique: false
         inverseJoinColumns:
           group_id:
             referencedColumnName: id