org.hibernate.AssertionFailure: null id in XXX entry (don't flush the Session after a

[kulkarni_ash]

I am using spring + hibernate,
i am getting following error after saveOrUpdate into a table fails and i am trying to execute SQL query after failure

The code in Controller as is below

@Controller
@Transactional
public class AirportController {

 @RequestMapping(value = "/displayAddAirport")
    public String displayAddAirport(@ModelAttribute("newairport") Airport newairport,Model model)throws Exception{
     
     try{
     airportDao.saveAirport(newairport);
  
     }
   catch(Exception exc){
// trying to read some other table data fails
   airtportDao.getData();
  }
}
}

The error is

org.hibernate.AssertionFailure: null id in XXXXXXX entry (don't flush the Session after an exception occurs)
	org.hibernate.event.def.DefaultFlushEntityEventListener.checkId(DefaultFlushEntityEventListener.java:82)
	org.hibernate.event.def.DefaultFlushEntityEventListener.getValues(DefaultFlushEntityEventListener.java:190)
	org.hibernate.event.def.DefaultFlushEntityEventListener.onFlushEntity(DefaultFlushEntityEventListener.java:147)
	org.hibernate.event.def.AbstractFlushingEventListener.flushEntities(AbstractFlushingEventListener.java:219)
	org.hibernate.event.def.AbstractFlushingEventListener.flushEverythingToExecutions(AbstractFlushingEventListener.java:99)
	org.hibernate.event.def.DefaultAutoFlushEventListener.onAutoFlush(DefaultAutoFlushEventListener.java:58)
	org.hibernate.impl.SessionImpl.autoFlushIfRequired(SessionImpl.java:1185)
	org.hibernate.impl.SessionImpl.list(SessionImpl.java:1261)
	org.hibernate.impl.QueryImpl.list(QueryImpl.java:102)
	org.springframework.orm.hibernate3.HibernateTemplate$30.doInHibernate(HibernateTemplate.java:921)
	org.springframework.orm.hibernate3.HibernateTemplate$30.doInHibernate(HibernateTemplate.java:1)
	org.springframework.orm.hibernate3.HibernateTemplate.doExecute(HibernateTemplate.java:406)
	org.springframework.orm.hibernate3.HibernateTemplate.executeWithNativeSession(HibernateTemplate.java:374)
	org.springframework.orm.hibernate3.HibernateTemplate.find(HibernateTemplate.java:912)
	org.springframework.orm.hibernate3.HibernateTemplate.find(HibernateTemplate.java:904)

[bwfrieds]

I would love to understand this error better. I seem to get it twice a week. And today I have no idea what id field is null. I have a simple select statement returning one row of all columns in one table. How can I get my dao pattern classes to return more specific/informational error messages?