Caching ClassMetadata of an joined subclass with id generator sequence with apc and xml mapping

CREATE TABLE first_class
(
  id serial NOT NULL,
  "type" integer,
  CONSTRAINT first_class_pkey PRIMARY KEY (id)
);

CREATE TABLE second_class
(
  id serial NOT NULL,
  other_stuff character varying,
  CONSTRAINT second_class_pkey PRIMARY KEY (id)
);

CREATE TABLE third_class
(
  id serial NOT NULL,
  other_stuff character varying,
  CONSTRAINT third_class_pkey PRIMARY KEY (id)
);

<?xml version="1.0" encoding="UTF-8"?>
<doctrine-mapping xmlns="http://doctrine-project.org/schemas/orm/doctrine-mapping" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://doctrine-project.org/schemas/orm/doctrine-mapping http://doctrine-project.org/schemas/orm/doctrine-mapping.xsd">

  <entity name="FirstClass" table='"first_class"' inheritance-type="JOINED">
    <id name="id" type="integer" column="id">
      <generator strategy="SEQUENCE"/>
      <sequence-generator sequence-name="first_class_id_seq" allocation-size="1" initial-value="1"/>
    </id>

    <discriminator-column name="type" type="integer" field-name="type" />

    <discriminator-map>
      <discriminator-mapping value="1" class="SecondClass" />
      <discriminator-mapping value="2" class="ThirdClass" />
    </discriminator-map>
  </entity>
</doctrine-mapping>

<?xml version="1.0" encoding="UTF-8"?>
<doctrine-mapping xmlns="http://doctrine-project.org/schemas/orm/doctrine-mapping" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://doctrine-project.org/schemas/orm/doctrine-mapping http://doctrine-project.org/schemas/orm/doctrine-mapping.xsd">

  <entity name="SecondClass" table="second_class">
    <field name="otherStuff" column="other_stuff" type="string" />
  </entity>
</doctrine-mapping>

<?xml version="1.0" encoding="UTF-8"?>
<doctrine-mapping xmlns="http://doctrine-project.org/schemas/orm/doctrine-mapping" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://doctrine-project.org/schemas/orm/doctrine-mapping http://doctrine-project.org/schemas/orm/doctrine-mapping.xsd">

  <entity name="ThirdClass" table="second_class">
    <field name="otherStuff" column="other_stuff" type="string" />
  </entity>
</doctrine-mapping>

class FirstClass {

  private $id;
  private $type;
}

class SecondClass extends FirstClass {
  private $otherStuff;
}

class ThirdClass extends FirstClass {
  private $otherStuff;
}

$firstClass = new FirstClass();
$doctrineEntityManager->persist($firstClass);

$secondClass = new SecondClass();
$doctrineEntityManager->persist($secondClass);

$firstClass = new FirstClass();
$doctrineEntityManager->persist($firstClass);


$thirdClass = new ThirdClass();
$doctrineEntityManager->persist($thirdClass);

Catchable fatal error: Argument 1 passed to Doctrine\ORM\Mapping\ClassMetadataInfo::setSequenceGeneratorDefinition() must be an array, null given, called in doctrine/2.0.0-BETA1/Doctrine/ORM/Mapping/ClassMetadataFactory.php on line 269 and defined in doctrine/2.0.0-BETA1/Doctrine/ORM/Mapping/ClassMetadataInfo.php on line 1222