Is ReferentialJDOStateManager not used in DataNucleus 4.x?

Is ReferentialJDOStateManager not used in DataNucleus 4.x?

By : user2949361
Date : November 17 2020, 01:00 AM
This might help you PersistenceCapable is not used by DataNucleus v4.x AFAIK; that was the old JDO-specific bytecode enhancement contract that they no longer use, now using DN-own Persistable. I also see that each StoreManager can define which StateManager/ObjectProvider it is using, and the RDBMS plugin specifies ReferentialStateManagerImpl
code :

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Troubleshooting DataNucleus JDO

Troubleshooting DataNucleus JDO

By : Mike G
Date : March 29 2020, 07:55 AM
this one helps. So you want to debug this yet you set log levels to INFO? I'd suggest DEBUG would make way more sense. The GAE/J docs have some page on logging - can't remember the URL sorry; search their Google Group cos there are several posts about it. How you invoke the enhancer is not defined ? Using Google's Eclipse plugin ? or manually ? or Maven2 ? or Ant ? The DN docs define where the log is ... for all options except Googles plugin (since that is theirs and we don't support it).
Obviously there is a local_db viewer - search their Google Group
Datanucleus for google cloud sql, missing org.datanucleus.store.rdbms.RDBMSStoreManager

Datanucleus for google cloud sql, missing org.datanucleus.store.rdbms.RDBMSStoreManager

By : ayman kandil
Date : March 29 2020, 07:55 AM
it fixes the issue The problem was a datanucleus jar versions mismatch.
I was using datanucleus-core, datanucleus-api-jdo etc at version 3.0.*, while datanucleus-rdbms 3.2. I've removed datanucleus-accessplatform-jdo-rdbms dependency, since I realized I didn't need all jars it brings in, and downgraded datanucleus-rdbms to 3.0.10 version. (Seems like datanucleus-appengine plugin is not yet supporting 3.2 series, that's why I preferred downgrade over upgrade).
Datanucleus v4 with GAE

Datanucleus v4 with GAE

By : alfredochv
Date : March 29 2020, 07:55 AM
To fix this issue See this page which says "use DataNucleus JDO/JPA to access the datastore" ? Well untick it because that is GAE/Datastore - not that Google's plugin tells you. Then put whatever jars you need for your JPA implementation into the CLASSPATH and all should be fine.
DataNucleus enchancer cannot instantiate org.datanucleus.api.jdo.JDOAdapter

DataNucleus enchancer cannot instantiate org.datanucleus.api.jdo.JDOAdapter

By : user3619545
Date : March 29 2020, 07:55 AM
With these it helps I had the same problem and was able to solve it by comparing https://cloud.google.com/appengine/docs/java/datastore/jdo/overview-dn2 and http://www.datanucleus.org/products/accessplatform_3_2/jdo/maven.html
There might be a simple typo in Google's pom.xml snippet. As you can read on the DataNucleus page the maven plug-in will automatically use the latest available datanucleus core. To prevent this use:
code :
        <!-- Comment in the below snippet to bind to all IPs instead of just localhost -->
        <!-- address></address>
        <port>8080</port -->
        <!-- Comment in the below snippet to enable local debugging with a remote debugger
        like those included with Eclipse or IntelliJ -->
        <!-- jvmFlags>
        </jvmFlags -->
Can't resolve org.datanucleus.store.appengine.query.JDOCursorHelper in DataNucleus jars supplied with appengine java sdk

Can't resolve org.datanucleus.store.appengine.query.JDOCursorHelper in DataNucleus jars supplied with appengine java sdk

By : 김혜성
Date : March 29 2020, 07:55 AM
I hope this helps you . I am using query cursors in my appengine java application as described here: , JDOCursorHelper is present in datanucleus-appengine-2.1.2.jar as
code :
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