The classes ValidatorContext and ValidatorFactory were deprecated and will be removed in Symfony 2.3.

[pawaclawczyk]

• The classes ValidatorContext and ValidatorFactory were deprecated and
  will be removed in Symfony 2.3. You should use the new entry point
  Validation instead.

  Before:

  $validator = ValidatorFactory::buildDefault(array('path/to/mapping.xml'))
      ->getValidator();
  

  After:

  $validator = Validation::createValidatorBuilder()
      ->addXmlMapping('path/to/mapping.xml')
      ->getValidator();