As of symfony 2.6 ``` php public function configureOptions(OptionsResolver $resolver) { $resolver->setDefined(array(/** 'option1', 'option2' */)); } ``` should be used instead of: ``` php public function setDefaultOptions(OptionsResolverInterface $resolver) { $resolver->setOptional(array(/** 'option1', 'option2' */)); } ``` As of 2.7 the former method is also deprecated