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POApp-Engine JDO consistent reading not working, maybe caching?
 

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  1. POApp-Engine JDO consistent reading not working, maybe caching?
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    <p>Today it's the first time I'm using GWT and JDO. I am running it with Eclipse in the local debug mode.</p> <p>I do the following thing:</p> <pre><code> public Collection&lt;MyObject&gt; add(MyObject o) { PersistenceManager pm = PMF.get().getPersistenceManager(); try { pm.makePersistent(o); Query query = pm.newQuery(MyObject.class);// fetch all objects incl. o. But o only sometimes comes... List&lt;MyObject&gt; rs = (List&lt;MyObject&gt;) query.execute(); ArrayList&lt;MyObject&gt; list= new ArrayList&lt;MyObject&gt;(); for (MyObject r : rs) { list.add(r); } return list; } finally { pm.close(); } } </code></pre> <p>I already set <code>&lt;property name="datanucleus.appengine.datastoreReadConsistency" value="STRONG" /&gt;</code> in my <code>jdoconfig.xml</code>. Do I have to set some other transaction stuff in the config? Was somebody got a working <code>jdoconfig.xml</code>? Or is the problem somewhere else? Some caching inbetween?</p> <p><strong>EDIT:</strong> Things I have tried:</p> <ul> <li>Setting NontransactionalRead/Write to false</li> <li>Using the same/a different <code>PersistenceManager</code> though calling <code>PMF.get().getPersistenceManager()</code> multiple times</li> <li>Using transactions</li> <li>ignoreCache = true on <code>PersistenceManager</code></li> <li>calling <code>flush</code> and <code>checkConsistency</code></li> </ul> <p>The jdoconfig:</p> <pre><code> &lt;persistence-manager-factory name="transactions-optional"&gt; &lt;property name="datanucleus.appengine.datastoreReadConsistency" value="STRONG" /&gt; &lt;property name="javax.jdo.PersistenceManagerFactoryClass" value="org.datanucleus.store.appengine.jdo.DatastoreJDOPersistenceManagerFactory"/&gt; &lt;property name="javax.jdo.option.ConnectionURL" value="appengine"/&gt; &lt;property name="javax.jdo.option.NontransactionalRead" value="true"/&gt; &lt;property name="javax.jdo.option.NontransactionalWrite" value="true"/&gt; &lt;property name="javax.jdo.option.RetainValues" value="true"/&gt; &lt;property name="datanucleus.appengine.autoCreateDatastoreTxns" value="true"/&gt; &lt;/persistence-manager-factory&gt; </code></pre> <p>I must be missing something central here because all approaches fail...</p> <p><strong>EDIT2:</strong> When I split the job into two transaction the log says that the write transaction fished and then the read transaction starts. But it doesn't find the just persited object. It always says <code>Level 1 Cache of type "weak" initialised</code> aswell. Is week bad or good?</p> <p>It about 30% of requests that go wrong... Might I be some lazy query loading issue?</p>
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    1. USFranz Kafka
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    1. COI also face same problem. I add some objects through my app, but they don't reflect in results, sometimes, and sometimes they do!
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    2. COand the object is in the datastore at the time of doing the query ? Obviously the log would tell you that. What this has to do with GWT is unclear ...
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    3. COWhere do I find a log? What it has to do with GWT? Alot, because it is a GWT project. I can't really pull a clear line between GWT and the app-engine therefore I call everything GWT that comes from google. And why would the caching be so messed up that the same instance can't even read data just written? Could you post a jdoconfig.xml which will always be consistent for the same client?
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