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POAppengine JPA level 2 cache fails to persist
 

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  1. POAppengine JPA level 2 cache fails to persist
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    <p>i am attempting to use the datanucleus jpa level 2 cache with appengine.</p> <p>i am really unclear on how to configure for appengine.</p> <p>i have the following </p> <pre><code>persistence.xml &lt;property name="datanucleus.cache.level2" value="true"/&gt; &lt;property name="datanucleus.cache.level2.type" value="javax.cache"/&gt; &lt;property name="datanucleus.cache.level2.cacheName" value="xxxxx"/&gt; </code></pre> <p>and the maven snippet</p> <pre><code>pom.xml &lt;dependency&gt; &lt;groupId&gt;org.datanucleus&lt;/groupId&gt; &lt;artifactId&gt;datanucleus-jpa&lt;/artifactId&gt; &lt;version&gt;1.1.5&lt;/version&gt; &lt;/dependency&gt; &lt;dependency&gt; &lt;groupId&gt;org.datanucleus&lt;/groupId&gt; &lt;artifactId&gt;datanucleus-cache&lt;/artifactId&gt; &lt;version&gt;1.1.1&lt;/version&gt; &lt;/dependency&gt; &lt;dependency&gt; &lt;groupId&gt;com.google.appengine.orm&lt;/groupId&gt; &lt;artifactId&gt;datanucleus-appengine&lt;/artifactId&gt; &lt;version&gt;1.0.10&lt;/version&gt; &lt;/dependency&gt; &lt;dependency&gt; &lt;groupId&gt;org.datanucleus&lt;/groupId&gt; &lt;artifactId&gt;datanucleus-core&lt;/artifactId&gt; &lt;version&gt;1.1.5&lt;/version&gt; &lt;/dependecny&gt; </code></pre> <p>Now the problem, when i persist a entity, it returns with a primary Key but it is not available from the either the datastore viewer or other queries. I get this problem with in local dev, junit test or remote instance of appengine.</p> <p>the code works fine as soon as the cache config is removed.</p> <p>snipet of test</p> <pre><code>@Test public void findById(){ MerchantPromotion merchantPromotion1 = new MerchantPromotion(); em.persist(merchantPromotion1); MerchantPromotion merchantPromotion = dao.findById( merchantPromotion1.getKey() ); assertNotNull( merchantPromotion); &lt;---- assert fails here } </code></pre> <p>what is the issue?</p> <p>thanks</p> <p>-lp</p>
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    1. USlpic
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      1. VTUpMod
    1. COYou're using an old version of GAE JPA (v2.0.0 is their latest). A level 2 cache does not "persist". A level 2 cache caches things (that are persisted). Obviously looking at the log would tell you all about what is and isn't persisted, and what is and isn't cached.
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    2. COthanks for the stating the difference between caching and persistence. i thought my question was very straight forward. Why adding level 2 cache does my entities not persist? datanucleus-jpa-1.1.5.jar is current for appengine 1.6.4.1, why is old if it part of the current distro?
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      1. USlpic
    3. COv2.0.0-final is most recent. Your version uses ancient software from the start of AppEngine. I said look at the log, since that tells you what is happening; have you?
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      1. USDataNucleus
 

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