DQL INNER JOIN with Zend Framework 2 / Doctrine 2 - doctrine-orm

Question

With this SQL-Statement, i can fetch the latest messages from all users:
SELECT m1.*
FROM message AS m1
INNER JOIN user
AS u1
ON m1.sender_id = u1.user_id
INNER JOIN (
SELECT sender_id,
MAX(dateSent) MaxDate
FROM message
WHERE receiver_id = 4
GROUP BY sender_id
) AS m2
ON m1.sender_id = m2.sender_id
AND m1.datesent = m2.MaxDate;
Those are my Entities in my Zend Framework 2 application:
First, i got the Message. A User can send a Message to another user.
/**
* #ORM\Entity
* #ORM\Table(name="message")
*/
class Message
{
/**
* #ORM\Id
* #ORM\GeneratedValue(strategy="AUTO")
* #ORM\Column(type="integer")
*/
private $id;
/**
* #ORM\ManyToOne(targetEntity="Application\Entities\User", inversedBy="messagesSent")
* #ORM\JoinColumn(referencedColumnName="user_id")
*/
private $sender;
/**
* #ORM\ManyToOne(targetEntity="Application\Entities\User", inversedBy="messagesReceived")
* #ORM\JoinColumn(referencedColumnName="user_id")
*/
private $receiver;
/**
* #ORM\Column(type="string", length=1024)
*/
private $message;
And the User entity here:
/**
* #ORM\Entity
* #ORM\Table(name="user")
*/
class User
{
/**
* #var int
* #ORM\Id
* #ORM\Column(type="integer")
* #ORM\GeneratedValue(strategy="AUTO")
*/
protected $user_id;
I tried to translate that SQL into DQL and got this:
SELECT m1.*
FROM Application\Entities\Message AS m1
INNER JOIN Application\Entities\User AS u1
WITH m1.sender_id = u1.user_id
INNER JOIN (
SELECT sender_id,
MAX(dateSent) MaxDate
FROM Application\Entities\Message
WHERE receiver_id = 4
GROUP BY sender_id
) AS m2
WITH m1.sender_id = m2.sender_id
AND m1.datesent = m2.MaxDate;
If i execute it, i get an error from Doctrine:
[Semantical Error] line 0, col 206 near '(
': Error: Class '(' is not defined.
What have i done wrong?

Answer 1

Subqueries are unavailable in doctrine(as far as I know) in DQL(from this). Can you write it query builder?
public function innerJoin($join, $alias = null, $conditionType = null, $condition = null);
See Reference