Doctrine2 – No Metadata Classes to process

I think you took the config example from Doctrine2: getting started:

$isDevMode = true;
$config = Setup::createAnnotationMetadataConfiguration([__DIR__."/src"], $isDevMode);

The trick is now that the Setup::createAnnotationMetadataConfiguration method uses a SimpleAnnotationReader by default. You can change this behaviour by changing the fifth parameter to false:

$isDevMode = true;
$config = Setup::createAnnotationMetadataConfiguration([__DIR__."/src"], $isDevMode, null, null, false);

This will force Doctrine to use the not-simple AnnotationReader which can handle your models now!