Not a valid entity or mapped super class
In my case I was missing * @ORM\Entity in my class definition.
/** * @ORM\Entity * @ORM\Table(name="listtype") */class ListType{ ...}
Define the base-class as follows:
/** * @ORM\MappedSuperclass */abstract class BaseUser{ // ...}Define the real entity:
/** * @ORM\Entity */class User extends BaseUser{ // ...}Because you're missing the @MappedSuperclass annotation on the base-class, Doctrine throws the exception you mention.
In my case, the problem was eaccelerator because it strips out all the comments which Doctrine uses. After disabling eaccelerator it worked . You can disable your php settings or,
in the web/app_dev.php or web/app.php file.
<?php ini_set('eaccelerator.enable', 0); ini_set('eaccelerator.optimizer', 0); //rest of the code.Note: Do clear the symfony2 cache after disabling this.