Validate your schema - these mappings are incorrect. Either a field is a column, or it is an association. Having both mappings on the same field is not allowed:
/**
* ilan_emlakOzellik
*
* @ORM\Table()
* @ORM\Entity
*/
class ilan_emlakOzellik
{
/**
* @ORM\Id
* @ORM\ManyToOne(targetEntity="ilan")
* @ORM\JoinColumn(name="ilanId")
*/
private $ilanId;
/**
* @ORM\Id
* @ORM\ManyToOne(targetEntity="emlakOzellik")
* @ORM\JoinColumn(name="ozellikId")
*/
private $ozellikId;