Hibernate saveorupdate is not updating

@[email protected](name = "LIBRARYITEM")@Suppress Warnings("serial")public class Libraryitem implements Serializable {//all the [email protected] @Id @Generated Value @Column(name = "ITEMRECNUMBER") public Integer get Itemrecnumber() //Rest of getters and setters...,564 DEBUG SQL:401 - /* insert Libraryitem */ insert into LIBRARYITEM (ITEMRECNUMBER, ITEMAUTHOR, ITEMBRIEFDESC, ITEMCALLNUMBER, ITEMCATEGORY, ITEMISBN, ITEMKEYWORD, ITEMLANGUAGE, ITEMLENGTH, ITEMMEDIATYPE, ITEMPUBLISHERNAME, ITEMSUBJECT, ITEMTITLE, ITEMTOTAVAILABLE, ITEMTOTBORROW, ITEMTOTQUANTITY, ITEMTOTRESERVE, ITEMYEAR) values (null, ? Libraryitem#1],847 DEBUG Default Save Or Update Event Listener:323 - updating [ Libraryitem,840 DEBUG Default Save Or Update Event Listener:205 - updating detached instance,840 DEBUG Default Save Or Update Event Listener:272 - updating [Update() or Lock() to re-associate the object with the session. In all of the above cases, you may still need to call Flush().Flush() basically synchronize the session with the database.Non Unique Object Exception: a different object with the same identifier value was already associated with the session: 4, of class: com.wrinkledog.phydeaux.model.Publication Of course, if I comment out the call to save Or Update(publication), then I get lazy Initialization Exception (if the publication is not yet in either of the Subscribers' Sets).

Basically, when should I use Save Or Update versus Flush?

So far I had been using Save Or Update most of the time, but I am worried it is wrong. I'm using NH in a web application and I was wondering if doing a single Flush just at the end of the page processing would be sufficient or there would be situations where it would cause a problem? I am trying to improve the performance of my stuff and I'd like to learn some best practices at the same time. the object is not associated with the session anymore.

That means it one of three things: the object has been loaded from a different session; you have cleared the session; or you have evicted the object from the session. Use Save Or Update() if you don't know if the object is new or not.

Subscriber.unsubscribed Publications#4f2252b203194e5a0103195114600001]@4000000042546b350354515c ,053 DEBUG Session Impl:2984 - uninitialized collection: [email protected] ,055 DEBUG Loader:197 - processing result [email protected] ,057 DEBUG Loader:405 - result row:@4000000042546b3503adcf84 ,059 DEBUG String Type:68 - returning '4f2252b203194e5a0103195114600001' as column: [email protected] ,061 DEBUG Loader:292 - found row of collection: [com.wrinkledog.phydeaux.model.

Subscriber.unsubscribed Publications#4f2252b203194e5a0103195114600001]@4000000042546b3503e60624 ,062 DEBUG Session Impl:3007 - reading [email protected] ,064 DEBUG Long Type:68 - returning '4' as column: [email protected] ,067 DEBUG Session Impl:1950 - loading [com.wrinkledog.phydeaux.model.

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*/@4000000042546b3501d6256c ,027 DEBUG Session Impl:3218 - initializing collection [com.wrinkledog.phydeaux.model.

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