Neos\Flow\Persistence\Doctrine\PersistenceManager::getObjectByIdentifier PHP Method

    public function getObjectByIdentifier($identifier, $objectType = null, $useLazyLoading = false)
    {
        if ($objectType === null) {
            throw new \RuntimeException('Using only the identifier is not supported by Doctrine 2. Give classname as well or use repository to query identifier.', 1296646103);
        }
        if (isset($this->newObjects[$identifier])) {
            return $this->newObjects[$identifier];
        }
        if ($useLazyLoading === true) {
            return $this->entityManager->getReference($objectType, $identifier);
        } else {
            return $this->entityManager->find($objectType, $identifier);
        }
    }