EJB timer state should be able to use a NoSQL store to persist its data

As an ejb-timer persistence there are current only

• file; local not shared and no clustering possible
• database; shareable possible to use cluster features

But sometimes a project does not need a relational database but there are NoSQL storages available.
Because of this it would be a benefit to add the ability for such Object databases like MongoDb, AWS dynamo and Infinispan.
It would be a plus if there is no need to have an extra RDBMS to persist timers