Disable caching in JPA (eclipselink)

Question

I want to use JPA (eclipselink) to get data from my database. The database is changed by a number of other sources and I therefore want to go back to the database for every

Answer 1

See,

http://wiki.eclipse.org/EclipseLink/UserGuide/JPA/Basic_JPA_Development/Caching

For the same EntityManager JPA always requires that one==two, so this is correct, not matter your caching options (this is the L1 cache, or transactional cache, which enforces your transaction isolation and maintains object identity).

To force the query to refresh (and revert any changes you have made) you can use the query hint "eclipselink.refresh"="true". Or probably better, use a new EntityManager for each query/request, or call clear() on your EntityManager.

Is the correct way to disable the shared cache (L2 cache). Please remove all your other settings as they are not correct, and can cause issues.

EclipseLink does not maintain a query cache by default, so those settings will have no affect. CacheUsage is also not correct, do not use this (it is for in-memory querying).