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I’m new to JPA, so forgive this question if this is pretty standard functionality, but can you use JPA without having a database and basically use it as a cache to store objects across your application? If so, is that standard practice?
You could use JPA with an in memory database so it would effectively just be a cache, yes. Using it ‘without a database’ at all would take huge amounts of work to build a custom JPA provider that works against whatever your storage is. If it’s truly a full JPA implementation that simply leaves off the ‘Persistent’ part, you’d spend months if not years alone just reinventing the wheel to implement the query language against your non-RDBMS cache and so forth.
I haven’t worked everywhere, but personally would certainly not file such a setup under ‘standard practices.’ 🙂