LazyInitializationException in Spring service

Question

I'm developing an application in Spring 3.0.5 and Hibernate 3.6.2, and currently i'm working in a JSON controller, but i have this exception and i can't understand why is happening. I've checked previously in SO and Google, but this problem is quite strange. So here is my code:

Controller

@RequestMapping(value = "/props", method = RequestMethod.GET)
public @ResponseBody 
List<Property> getJsonProps(String id) {        
    if(id==null)return null;
    Device dev = deviceService.getDispositivo(Long.parseLong(id));
    List<Property> props = deviceService.listProperties(dev, 10);
    return props;
}

Device Service

@Service("manageDevices")
@Transactional(readOnly=true,propagation=Propagation.REQUIRED)
public class ManageDevicesImpl implements ManageDevices {

private Logger log = LoggerFactory.getLogger(getClass());

@Autowired
private DevicesDAO devicesDAO; 


    public List<Property> listProperties(Device dev, Integer qty) {
    List<Property> props =  devicesDAO.pickProperties(dev, qty);
    return props; 
    }
}

DAO

@Repository("devicesDAO")
public class DevicesDAOImpl implements DevicesDAO {
private Logger log = LoggerFactory.getLogger(getClass()); 

@Autowired
private SessionFactory sessionFactory;

public List<Property> pickProperties(Device dev, Integer qty) {
    if(qty >= 0){           
        log.debug("Open? "+ sessionFactory.getCurrentSession().isOpen());
        log.debug("Tx Active? " + sessionFactory.getCurrentSession().getTransaction().isActive());
        List<Property> props = dev.getProperties();
        if(props != null){
            if(props.size() >= qty)
                return props.subList(0, qty-1);
            else
                return props;
        }
    }
    return null;
}

}

The exception occurs in the pickProperties function (DAO Layer), at the line where i try to load the properties (getProperties). In the logs, there is an open session and transaction. Thanks in advance.

gatkin · Accepted Answer · 2011-06-14 19:38:29Z

1

Could you post the exact exception you got?

You're in a transaction at the dev.getProperties() line, but not the transaction where dev was loaded. You either need to reattach it, or arrange for dev.getProperties() to be called while you're still in the transaction that loaded it, or move the transactional boundary up so that both calls are in the same transaction, or change the Hibernate configuration so that properties isn't lazy loaded, or change the code that loads dev so that it fetches properties in HQL.

Which of those options will apply to you depends on your situation, but I'd start with the last one.

answered Jun 14, 2011 at 19:38

gatkin

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1 Comment

Jairo Over a year ago

Thanks for your answer. The exception being thrown was org.hibernate.LazyInitializationException, i don't post the whole stack trace because your post clarified some concepts, and as a result i'll modify the logic in the service method, to ensure that all will be done inside the same transaction.

Abdullah Jibaly · Accepted Answer · 2011-06-14 19:20:53Z

1

Looks like your transaction is created after the Device dev is read. Try reading/rereading it within the transaction to see what happens.

answered Jun 14, 2011 at 19:20

Abdullah Jibaly

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1 Comment

Jairo Over a year ago

Thanks for your answer, certainly it was a design fault, calling the getProperties method inside the loading method of "device" it works just fine, I'll modify the service method to do all the fetching in one single transaction.

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