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Editorial Team
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Asked: 2026-06-16T13:09:00+00:00

I am using DN3 and GAE 1.7.4. I use JPA2 which according to the

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I am using DN3 and GAE 1.7.4.
I use JPA2 which according to the documentations by default has Level2 cache enabled.

Here is my question:

If I run a query that returns some objects, would these objects be put in the cache automatically by their ID?

If I run em.find() with an id of an object which has already been loaded with another query createQuery().getResultList() would it be available in the cache?

Do I need to run my em.find() or query in a transaction in order for the cache to kick in?

I need some clarification on how this cache works and how I could do my queries/finds/persists in order to make the best use of the cache.

Thanks

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1 Answer

  1. Editorial Team

    After debugging in development local GAE mode I figured level 2 cache works. No need for transaction begin/commit. The result of my simple query on primary keys as well as em.find() would be put in the cache by their primary keys.

    However the default cache timeout in local development server is like a few seconds, I had to add this:

        <property name="datanucleus.cache.level2.timeout" value="3600000" />

    to persistence.xml.

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