CODEWITHSUNDEEP
javacachingjakarta-eejpa
FAtBalloon
FAtBalloon

Reputation: 4500

Using JPA as a caching mechanism?

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?

Upvotes: 2

Views: 329

Answers (2)

Tomasz Nurkiewicz
Tomasz Nurkiewicz

Reputation: 340733

JPA is just an API implemented by few major players like Hibernate, EclipseLink and OpenJPA (so called persistence providers). All these libraries implement object-relational mapping and are focused towards database.

I don't really get your motivation but you can:

  • use in-memory database like H2 and any persistence provider

  • use de-facto standard caching solutions like EhCache or JCache API abstraction

  • implement your own persistence provider implementing JPA. The scariest and worst solution.

Upvotes: 1

Affe
Affe

Reputation: 47974

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.' :)

Upvotes: 3

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