NucleusObjectNotFoundException

[nikhil dhankani]

Hi,

I am getting the below exception even when I have the entity with Id 4 for the kind X.

Could not retrieve entity of kind X with key X("X(4)")

org.datanucleus.exceptions.NucleusObjectNotFoundException: Could not retrieve entity of kind X with key X("X(4)")

at com.google.appengine.datanucleus.DatastoreExceptionTranslator.wrapEntityNotFoundException(DatastoreExceptionTranslator.java:61)

at com.google.appengine.datanucleus.EntityUtils.getEntityFromDatastore(EntityUtils.java:670)

at com.google.appengine.datanucleus.DatastorePersistenceHandler.fetchObject(DatastorePersistenceHandler.java:543)

at org.datanucleus.state.JDOStateManager.loadFieldsFromDatastore(JDOStateManager.java:1638)

at org.datanucleus.state.JDOStateManager.validate(JDOStateManager.java:3511)

at org.datanucleus.ObjectManagerImpl.findObject(ObjectManagerImpl.java:3379)

at org.datanucleus.api.jdo.JDOPersistenceManager.getObjectById(JDOPersistenceManager.java:1722)

at org.datanucleus.api.jdo.JDOPersistenceManager.getObjectById(JDOPersistenceManager.java:1740)

        ...................

Below is the structure of Kind X,

@PersistenceCapable

class X {
@PrimaryKey
 @Persistent(valueStrategy = IdGeneratorStrategy.IDENTITY)
 private Key xId;

 // getter setter for xId and other attributes
}

I am trying to retrieve this using below code,

getX(String id){
PersistenceManager pm = PMF.get().getPersistenceManager();
 ...
 Key k = KeyFactory.createKey(X.class.getSimpleName(), id);
 X x = pm.getObjectById(X.class, k);
 //X x = pm.getObjectById(X.class, id);  // Even this does not work
 return x;
 ...
}

I am sure I am doing some silly and basic mistake here. Can someone out here figure out as to what am I doing wrong over here ?

Thanks !

[Ian Marshall]

This sort of question is ideal to be asked on StackOverflow.

[Vinny P]

On Mon, Nov 11, 2013 at 9:14 PM, skin <nikhild...@gmail.com> wrote:

I am getting the below exception even when I have the entity with Id 4 for the kind X.

Could not retrieve entity of kind X with key X("X(4)")

org.datanucleus.exceptions.NucleusObjectNotFoundException: Could not retrieve entity of kind X with key X("X(4)")

If you query the datastore for this entity using a property search, does this entity show up in the query results?

 

 

-----------------

-Vinny P

Technology & Media Advisor

Chicago, IL

App Engine Code Samples: http://www.learntogoogleit.com

  

[nikhil dhankani]

Yes, it does show up. Strangely, this is not just happening to this particular id but to all entities in this Kind.

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[Vinny P]

On Wed, Nov 13, 2013 at 2:38 AM, nikhil dhankani <nikhild...@gmail.com> wrote:

Yes, it does show up. Strangely, this is not just happening to this particular id but to all entities in this Kind.

 

Instead of using a Key instance, can you use a Long as the entity's primary key and see if you can extract the entity? Here's an example: https://developers.google.com/appengine/docs/java/datastore/jdo/creatinggettinganddeletingdata#Keys

[nikhil dhankani]

I cannot use Long or String as the key because this is referred in another Kind. I will have try with key with encoding.

[nikhil dhankani]

So using encodedKey and post at http://stackoverflow.com/a/2761961/563746 helped. Issue was Kind X was being used in Kind Y with a one to many relation.

But I still fail to understand that why would it not get me the object when it is there ? What can be the issue there ?

Will continue this discussion at http://stackoverflow.com/questions/19933134/nucleusobjectnotfoundexception-could-not-retrieve-entity-of-kind-x