Investigate if Jandex can be used to optimize CDI + Bean Validation integration for method validation

For CDI + Bean Validation integration for method validation, we're making use of the Hibernate Validator CDI portable extension. We can try to optimize this portable extension by making use of the Jandex index. In particular, we can:

1) Determine if Jandex can be used for subtype retrieval to avoid having to specify @ValidateOnExecution(IMPLICIT)
2) Determine if Jandex can be used to speed up constraint metadata retrieval