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14076910
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2012-12-28T23:07:39.223
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2012-12-29T10:53:31.110
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2017-05-23T12:32:06.453
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From <a href="https://developers.google.com/appengine/docs/java/datastore/jpa/overview-dn2" rel="nofollow noreferrer">Google App Engine: Using JPA with App Engine</a> <blockquote> Level2 Caching is enabled by default. To get the previous default behavior, set the persistence property datanucleus.cache.level2.type to none. (Alternatively include the datanucleus-cache plugin in the classpath, and set the persistence property datanucleus.cache.level2.type to javax.cache to use Memcache for L2 caching. </blockquote> As for your doubts, this depends on your query as well as DataNucleus and GAE Datastore adapter implementation specifics. As <a href="https://blogs.oracle.com/carolmcdonald/entry/jpa_caching" rel="nofollow noreferrer">Carol McDonald suggested</a> I believe that the best path to find the answers for your questions is with JPA2 <a href="http://docs.oracle.com/javaee/6/api/javax/persistence/Cache.html" rel="nofollow noreferrer">Cache</a> interface... More specifically the <a href="http://docs.oracle.com/javaee/6/api/javax/persistence/Cache.html#containscontains(java.lang.Class%2C%20java.lang.Object)" rel="nofollow noreferrer">contains</a> method. Run your query, get access to the <code>Cache</code> interface through the <code>EntityManagerFactory</code> and see if the Level 2 cache <code>contains</code> the desired entity. Enabling <a href="https://stackoverflow.com/questions/10193919/how-to-set-loglevel-of-the-appengine-datastore-in-java">DataNucleus</a> logs will also give you good hints about what is happening behind the scenes.
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1. PODoes google app engine java datastore cache JPA query results?
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