Has anyone else encountered ExecutionContext error for annotation validation from symfony 2.4 to 2.5?
From the source, you can see it is deprecated since V2.5. You will indeed have to use ExecutionContext :
https://github.com/symfony/Validator/blob/2.5/Context/LegacyExecutionContext.php#L25
@deprecated Implemented for backwards compatibility with Symfony < 2.5. To be removed in Symfony 3.0.