Apache Metamodel has moved to the attic. why it is moved and what are the alternatives?
You can still continue to depend on MetaModel, it just won't be maintained by Apache. It's also used by several other projects (most notably - I think - by DataCleaner) so maybe creating a fork with a less formal governance model around it would be an option that other communities would appreciate. I help maintain DataCleaner and was heavily involved in Apache MetaModel and would love to at least have a repo set up where we can contribute dependency upgrades, bug fixes and such.