How to integrate Spring and Hibernate Entitymanager?

[dth]

Guys,

What versions of Hibernate, Hibernate Entity Manager and Spring are you using?

I've grabbed the sample code from Thomas' presentation, but can't seem to get it to do what I want. Keeping the code as it is, I get:

java.lang.NullPointerException
	at com.springdeveloper.service.BeerDistributorServiceJpa.getCustomerList(BeerDistributorServiceJpa.java:27)
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) 
        ...

getEntityManager() is null. I can force creation of it by EntityManagerFactory.createEntityManager(), but them I'm faced with

javax.persistence.TransactionRequiredException: no transaction is in progress
	at org.hibernate.ejb.AbstractEntityManagerImpl.checkTransactionActive(AbstractEntityManagerImpl.java:130)
	at org.hibernate.ejb.AbstractEntityManagerImpl.merge(AbstractEntityManagerImpl.java:145)
	at com.springdeveloper.service.BeerDistributorServiceJpa.saveCustomer(BeerDistributorServiceJpa.java:48)

I'm using the JpaTransactionManager as supplied in the sample code, but it doesn't seem to create a new tx when required.

FYI, Hibernate 3.1rc1, Hibernate EM 3.1beta4, Spring 1.3RC1

Can anyone shed some light on this?

thanks!

[sbeigel]

I've put together a small tutorial describing all this stuff:

http://jroller.com/page/sbeigel?entr...va_persistence

Sebastian

[dth]

Top work!

I was extending JpaSupport (not JpaDaoSupport) and using getEntityManager() rather than using the JpaTemplate.

All works now.. thanks for your help

[joe1chen]

Is the JPA preview code still available? I noticed that it was removed from CVS by robharrop on 12/7/05 with the comment "Removed old JPA code". Has this code simply been moved elsewhere and if so where?

[sbeigel]

It's moved to the sandbox -- and currently not included in the 2.0 milestone builds. Don't know why actually...

Sebastian

[trisberg]

That's because the spec is not final yet and the api is still undergoing changes. So for now we have to use it out of the sandbox.

[oravecz]

Is the code in the sandbox currently compatible with the Spring 2.0M2 builds?

I take it the code in the sandbox is not included in the nightly snapshots?

[vanyatka]

Top work!

I was extending JpaSupport (not JpaDaoSupport) and using getEntityManager() rather than using the JpaTemplate.

All works now.. thanks for your help

My DAO extend JpaDaoSupport and yet I get null when call getEntityManager().
Do you mean I should use those "find" methods of JpaTemplate object, instead of using EntityManager? I thought that since we use JPA here anyway, than JpaTemplate uses EntityManager underneath, so why can't I get a reference to it?

Is it because of different exception model? Using EntityManager directly implies dealing with checked exceptions as opposed to wraped exceptions, am I right?

Thanks,