Spring Data JPA findOne returns null - spring

Question

I'm using Spring Data JPA and I'm facing a very weird issue with findOne method which is returning null even though the row is present in DB.
I have a consumer thread which takes an id from a queue and tries to fetch the entity from DB which always returns null, however if I pause thread (by putting a breakpoint before method call) then it fetches the entity from DB but returns null in normal execution of program, I know it sounds weird with breakpoint stuff but it is what it is, may be I'm missing something. My code looks like below:-
if (id > 0) {
employee = employeeService.get(id);
if (employee == null) {
logger.error(String.format("No employee found for id : %d",
id));
return;
}
I'm not using any transaction in "employeeService" as it is not required as it is a read operation.
My service looks like
public Employee get(long id) {
return employeeDao.findOne(id);
}
And my model looks like:-
#Entity
#Table(name = "employee")
#JsonInclude(JsonInclude.Include.NON_NULL)
public class Employee implements Serializable {
private static final long serialVersionUID = 1681182382236322985L;
#Id
#GeneratedValue(strategy = GenerationType.AUTO)
private long id;
#Column(name = "name")
private String name;
#OneToMany(fetch = FetchType.EAGER, cascade = CascadeType.ALL)
#JoinColumn(name = "emplopyee_id")
#Fetch(FetchMode.SELECT)
private List<Address> addresses;
// getter/setter and few fields have been omitted
}
Can somebody point me where I'm mistaking.

Answer 1

The Spring 4.2 way to do this would be to introduce a #TransactionEventListener annotated method on a spring component to handle the callback. You then simply need to publish an event and let the event framework do its thing:
// Spring component that handles repository interactions
#Component
public class ProducerService implements ApplicationContextAware {
private ApplicationContext applicationContext;
#Transactional
public void doSomeThingAwesome(String data) {
MyAwesome awesome = new MyAwesome( data );
myAwesomeRepository.save( awesome );
applicationContext.publishEvent( new MyAwesomeSaved( awesome.getId() ) );
}
}
// Spring component that handles the AFTER_COMMIT transaction callback
// This component only fires when a MyAwesomeSaved event is published and
// the associated transaction it is published in commits successfully.
#Component
public class QueueIdentifierHandler {
#TransactionalEventListener
public void onMyAwesomeSaved(MyAwesomeSaved event) {
Long entityId = event.getId();
// post the entityId to your queue now
}
}