Re: [eclipselink-users] v. 1.0.2 EntityManagerFactoryImpl throwing null

[Tom Ware <tom.ware@xxxxxxxxxx>]

Hi Gordon,

  Are you running in JavaSE or in some kind of container?

  Are you using a connection pool?

  Is it external to EclipseLink or EclipseLink's own connection pool?

  How does your test obtain the connection and reestablish it?

  I am not surprised that the scenario you are describing is causing issues. 
EclipseLink has some strategies you can use to reestablish connections, but 
doing it somewhere EclipseLink is completely unaware of could cause an issue.

-Tom

Gordon Ferguson wrote:
> Hi Tom,
> It has been a few weeks but I'm back to this question.
>
> The basic scenario I'm having trouble with is recovery after a
> SQLException: Io exception: The Network Adapter could not establish the 
> connection ...
>
> My test case forces that error and then restores the underlying
> connection. I then want to get EclipseLink going again.
>
> Is there an api to get a (new?) working EntityMangager at this point?
>
> What I'm trying is invoke close() both the EntityManager and the
> EntityManagerFactory. (Nothing thrown by this.) Then I repeat this code:
>
> protected  void privateInit(String persistenceUnitLabel, ...) {
>   emf = 
> Persistence.createEntityManagerFactory(persistenceUnitLabel);        
>   entityManager = emf.createEntityManager();
>   ...
> }
>
> and the first line creates the stack trace below.
>
> Thanks for any suggestions,
> Gordon
>
> Tom Ware wrote:
> > Hi Gordon,
> >
> >   If EclipseLink is following the expected code path, the 
> > structConverters should be initialized inside the "if (state == 
> > STATE_PREDEPLOYED) {" code block below where the structConverters 
> > variable is being defined on the following line:
> >
> > structConverters = processor.getStructConverters();
> >
> >   If you are not getting into that if statement and still getting to 
> > "addStructConverters(session, structConverters)" something strange is 
> > occurring with your deployment. It is hard to say what the problem is 
> > without more information about the symptoms of the problem you are 
> > seeing.
> >
> > -Tom
> >
> > Gordon Ferguson wrote:
> > > Hello,
> > >
> > > I'm using the SE approach and testing my 'recovery after error' logic.
> > > I see the exception listed below. I looked at the code and found
> > > EntityManagerSetupImpl.deploy() method initializes
> > > structConverters to null in l.189
> > > Then, in l. 319 passes that null to addStructConverters(...) which 
> > > tries to add to the (null) List.
> > >  List<StructConverter> structConverters = null;
> > >
> > > SO, I'm wondering if this is just a coding typo or if I need to dig 
> > > deeper
> > > into why I'm in this state?
> > >
> > > Any suggestions would be appreciated.
> > >
> > > Thanks,
> > > Gordon
> > >
> > >
> > >
> > >
> > >
> > >
> > >
> > > Listing:
> > >
> > > [EL Info]: 2008.10.30 
> > > 11:53:03.781--ServerSession(653967)--EclipseLink, version: Eclipse 
> > > Persistence Services - 1.0.2 (Build 20081024)
> > > Exception in thread "main" [EL Info]: 2008.10.30 
> > > 11:53:10.328--ServerSession(653967)--file:/D:/projs/costar-1.3/jclass/-True-DevDev 
> > > login successful
> > > costar.dbaccess.DbAccessException: Could not access database.
> > >     at 
> > > costar.dbaccess.jpa.CoStarJpaAccess.privateInit(CoStarJpaAccess.java:82)
> > >     at 
> > > costar.dbaccess.jpa.CoStarJpaAccess.<init>(CoStarJpaAccess.java:53)
> > >     at 
> > > costar.dbaccess.jpa.test.JpaConnectionCheckerChecker.main(JpaConnectionCheckerChecker.java:104) 
> > >
> > > Caused by: java.lang.NullPointerException
> > >     at 
> > > org.eclipse.persistence.internal.jpa.EntityManagerSetupImpl.addStructConverters(EntityManagerSetupImpl.java:319) 
> > >
> > >     at 
> > > org.eclipse.persistence.internal.jpa.EntityManagerSetupImpl.deploy(EntityManagerSetupImpl.java:249) 
> > >
> > >     at 
> > > org.eclipse.persistence.internal.jpa.EntityManagerFactoryImpl.getServerSession(EntityManagerFactoryImpl.java:69) 
> > >
> > >     at 
> > > org.eclipse.persistence.internal.jpa.EntityManagerFactoryImpl.createEntityManagerImpl(EntityManagerFactoryImpl.java:118) 
> > >
> > >     at 
> > > org.eclipse.persistence.internal.jpa.EntityManagerFactoryImpl.createEntityManagerImpl(EntityManagerFactoryImpl.java:112) 
> > >
> > >     at 
> > > org.eclipse.persistence.internal.jpa.EntityManagerFactoryImpl.createEntityManager(EntityManagerFactoryImpl.java:100) 
> > >
> > >     at 
> > > costar.dbaccess.jpa.CostarJpaFacade.<init>(CostarJpaFacade.java:47)
> > >     at 
> > > costar.dbaccess.jpa.CoStarJpaAccess.privateInit(CoStarJpaAccess.java:80)
> > >     ... 2 more
> > >
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