CODEWITHSUNDEEP
google-app-enginegwtweb-applicationsdatanucleuspersistence-manager
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Reputation: 305

Persistence manager failing to instantiate

I have a web application project using gwt and using google app engine to store my data. When I run my project I get the following error:

 WARNING: Error for /proj/saat
 java.lang.NoSuchFieldError: NUCLEUS_CONTEXT_LOADER
     at org.datanucleus.api.jdo.JDOPersistenceManagerFactory.<clinit>(JDOPersistenceManagerFactory.java:101)

saat is an the class that I am trying to store on my google app engine. proj is the name of my project. I try to instantiate my persistenceManager in saatServiceImpl in the server package as follows:

    private static final PersistenceManagerFactory pmf = JDOHelper
        .getPersistenceManagerFactory("transactions-optional");

and this the the line the error is issued at. I have no idea how to fix this problem. Any hints is appreciated.

Upvotes: 4

Views: 1423

Answers (2)

nanospeck
nanospeck

Reputation: 3548

I don't know how or why but something that worked for me was I opened up com.google.appengine.eclipse.core.prefs and changed the property:

gaeDatanucleusVersion=v2 to gaeDatanucleusVersion=v1

Upvotes: 1

Manolo Carrasco Mo&#241;ino
Manolo Carrasco Mo&#241;ino

Reputation: 9741

You are using a wrong DataNucleus library for your GAE environment, check this table and set in your project the appropriate one.

Upvotes: 2

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