DataNucleus Forum

What logging level displays schema change message without the SQL?

Thu, 17 May 2012 06:22:59 +0200

Background: Customer recently updated application and it had schema changes to tables & indexes that had *lots* of rows. Consequently at start up there was quite a long delay while these scheme and index updates took place.... so long that they user assumed the app had hung and so restarted it... not always good! I'm trying to set the logging level so that I can display messages ...

org.datanucleus.exceptions.NucleusUserException: Persistence process has been specified to use a ClassLoaderResolver of name "" yet this has not been found by the DataNucleus plugin mechanism.

Tue, 15 May 2012 18:08:01 +0200

Hi, I'm trying to create a J2EE application in JBoss AS 7.1 and use force.com API that uses datanucleus as JPA provider. I created @Singleton@Startup EJB bean that tries to create EntityManagerFactory like this: [code] Map properties = new HashMap(); properties.put("datanucleus.storeManagerType", "force"); ...

Class "" was not found in the CLASSPATH error when combining OR and AND in a query

Mon, 14 May 2012 14:01:17 +0200

Hi, I get a JDOException exception when I use a filter containing OR and AND elements. As in the DataNucleus tutorial, I have a class Product, a class Book which is a subclass of Product, and a class Inventory which contains a list of of Product objects. I construct my query in the following way: [code] Query q = pm.newQuery(Inventory.class) q.declareVariables("Product b"); ...

Error when using fetch() in CriteriaQuery

Mon, 14 May 2012 02:54:26 +0200

Hello, When fetch() method is specified on a Root object, a NullPointerException is caused later in EntityManager.createQuery(). Example code: [code] private TypedQuery createQuery(String key, EntityManager entityManager) { CriteriaBuilder builder = entityManager.getCriteriaBuilder(); CriteriaQuery query = ...

Datanucleus JPA with felix

Sat, 28 Apr 2012 14:12:17 +0200

What may cause this? Caused by: org.datanucleus.exceptions.NucleusUserException: Persistence process has been specified to use a ClassLoaderResolver of name "jpa" yet this has not been found by the DataNucleus plugin mechanism. Please check your CLASSPATH and plugin specification. at org.datanucleus.NucleusContext.(NucleusContext.java:242) at ...

Value missing in RDBMS after making sure the object has the value. -- POSSIBLE BUG --

Thu, 10 May 2012 15:32:21 +0200

To whom it may concern, This is my first try of DataNucleus, in all regards i'm very pleased with the features and capacities of the package. Although I'm having a bit of a problem I have set an object hierarchy for testing and I keep having the problem that the class that is located as a second hierarchy everytime that I create a new instance of it one the fields seem to disappear at ...

Null returned when persisting a collection of Serializable objects

Tue, 26 Oct 2010 16:04:02 +0200

I have a class like this: @PersistenceCapable public class TestSerializableModelObj { @Persistent(serialized="true", defaultFetchGroup="true") private ArrayList myArrayList; //... } When I persist this and re-read it from the database all other primitive fields that I may have defined are loaded properly, but I cannot get the ArrayList (or any List, ...

DataNucleus AccessPlatform 3.1.0 M3 released

Fri, 11 May 2012 07:34:27 +0200

[img]http://www.datanucleus.org/images/logos/DataNucleus_AccessPlatform_80.jpg[/img] We're pleased to announce the release of "3.1 Milestone 3" of Access Platform on the "Kepler" branch. This is the third milestone towards version 3.1 of AccessPlatform and makes some minor changes to internal structure etc. Support for non-transactional atomic updates has been added ...

datanucleus level 2 cache returning stale value

Wed, 09 May 2012 02:08:28 +0200

appengine 1.6.4 datanucleus-appengine-2.0.0 datanucleus cache 3.0.1 hi all i am getting stale data returned from a read query using the datanucleus level 2 cache. my persistent config has NO cache setting so from the docs it is using a default setting. It seems to be related to the level 2 cache because when the level 2 cache is set to NONE the operations work successfully. ...

Getting ClassNotPersistenceCapableException when persisting object using serialization

Tue, 08 May 2012 21:57:03 +0200

I've upgraded to 3.0.9 from 3.0.2, using RDBMS. For some reason I'm getting an error about the type not being persistence capable but I'm saving the data into a field that is marked as serialized so the type should not need to be persistence capable (right?). The error only happens when I merge data (persist an object queried from the store), not the initial persisting. Caused by: ...

Query with access to field that it can't resolve correctly

Tue, 08 May 2012 10:30:14 +0200

Hello everybody, I have two classes: Prefix: [code] @PersistenceCapable(table = "PREFIXES", detachable = "true") public class Prefix { @PrimaryKey @Persistent(column = "ID", valueStrategy = IdGeneratorStrategy.IDENTITY) private Long id; @Persistent(column = "PREFIX") @Unique @Column(jdbcType = "VARCHAR", ...

[Performance issue] Access to the objects from pm.detachAllOnCommit() is slow?

Mon, 07 May 2012 04:24:45 +0200

If I understand DN correctly, [s]the result return by of the following 2 pieces of code should be the same, right?[/s] They are actually different. A: Use setDetachAllOnCommit() to detach objects [code]ts.begin(); pm.setDetachAllOnCommit(true); List ex = (List) q.execute(value1); ts.commit(); return ex ;[/code] B: Use detachCopyAll() to detach and copy over all the ...

Looking for an ORM/Serializer hybrid project

Sat, 05 May 2012 23:19:42 +0200

Hi! I'm in search of a Java API that is a combination of ORM and Serializer. A serializer does not build on any backend structure. It just produces a byte array/stream, and consumes a byte array/stream when de-serializing. But it always serialize the whole graph, or deserializes the whole graph, building on nothing. An ORM would normally load objects from some data store, keep track of ...

Problems with Cascading deletes

Tue, 01 May 2012 23:32:51 +0200

I have read the online docs and scoured the forums, but I just can't seem to get my application to do a cascading delete with a Join. Note the two classes below: [code]@PersistenceCapable(detachable = "true") public class Job{ @Persistent(valueStrategy = IdGeneratorStrategy.INCREMENT) private Long id; @Element(types=com.foo.service.domain.Problem.class, ...

Same PersistenceManager, same (application) identity, different instances...?

Fri, 21 Oct 2011 08:33:45 +0200

This is not supposed to be possible according to JDO, right? I have verified, in the debugger, that both objects are owned by the same Persistence manager (in the same thread), have the same ID (an int), and are different object instances. Are there any known situations or things to do/not do in Datanucleus' JDO that could cause this? I'm hoping it's not a DN bug and something ...