public function validate(ExecutionContextInterface $context)
 {
     if ($this->password != $this->repeatPassword) {
         $context->buildViolation('The specified passwords are not identical!')->atPath('password')->addViolation();
         return false;
     }
     if (!PasswordBuilder::isPasswordStrongEnough($this->password)) {
         $context->buildViolation('The password must contain lowercase, uppercase letters and numbers.')->atPath('password')->addViolation();
         return false;
     }
 }