Adding to datastore using EntityManager throws an exception

Question

I am using following code to add an entity to datastore. However, I am getting an exception which I am not able to resolve. Any insights?

EntityManager em = EMFService.get().createEntityManager();
MyEntity temp = new MyEntity (param1, numOptions, option1, option2, option3);
em.persist(temp);
em.close();

I get the following exception at em.close() line in above code:

javax.persistence.PersistenceException: Cannot make object transient since object is new and not yet committed
    at org.datanucleus.api.jpa.NucleusJPAHelper.getJPAExceptionForNucleusException(NucleusJPAHelper.java:302)
    at org.datanucleus.api.jpa.JPAEntityManager.close(JPAEntityManager.java:197)
    at com.vikrams.examquestweb.dao.Dao.addQuestion(Dao.java:34)

It's weird that searching for the exception description "Cannot make object transient since object is new and not yet committed" in Google gives no matching results. Am I the first one who got this. Maybe I am making some really silly mistake somewhere. Please help.

BBogdan · Accepted Answer · 2014-01-28 15:39:36Z

1

First of all you will also need to open a transaction to save any entity. The basic code to do this is something like this:

em.getTransaction().begin();    
em.persist(temp);
em.close(); 
em.getTransaction().commit();
em.close();

Then you should also post howr you entity looks and how it is mapped.

answered Jan 28, 2014 at 15:39

BBogdan

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