The JAX-RS Metamodel holds all the elements discovered in the Java Model (plus web.ml) and provides with a set of methods to retrieve elements. To improve performance, these elements have been indexed in maps on a given criteria, but some validation tasks require more complex queries (eg: finding duplicate providers, checking if an exception mapper would match the resource method by querying against the thrown exception + produced mediatype, etc.)

Thus, being able to index all the JAX-RS elements against their properties then being able to perform complex queries could be an alternative to evaluate.