Hibernate is persisting entity during flush when the entity has not changed

Posted by Preston on Stack Overflow See other posts from Stack Overflow or by Preston
Published on 2010-05-18T23:06:22Z Indexed on 2010/05/18 23:10 UTC
Read the original article Hit count: 335

Filed under:

hibernate

|

entity

|

jdbc

I'm having a problem where the entity manger is persisting an entity that I don't think has changed during the flush.

I know the following code is the problem because if I comment it out the entity doesn't persist. In this code all I'm doing is loading the entity and calling some getters.

Query qry = em.createNamedQuery("Clients.findByClientID");
qry.setParameter("clientID", clientID);

Clients client = (Clients) qry.getSingleResult();

results.setFname(client.getFirstName());
results.setLname(client.getLastName());
...
return results;

Later in a different method I do another namedQuery which causes the entity manger to flush. For some reason the client loaded above is persisted.

The reason this is a problem is because in the middle of all this, there is some old code that is making some straight JDBC changes to the client. When the entity manger persists the changes made by the straight JDBC are lost.

The theory we have at moment is that the entity manger is comparing the entity to the underlying record, sees that it's different, then persists it.

Can someone explain or confirm the behavior we're seeing?

© Stack Overflow or respective owner

Related posts about hibernate

Hibernate + PostgreSQL : relation does not exist - SQL Error: 0, SQLState: 42P01

as seen on Stack Overflow - Search for 'Stack Overflow'
Hello, I am having some problems trying to work with PostgreSQL and Hibernate, more specifically, the issue mentioned in the title. I've been searching the net for a few hours now but none of the found solutions worked for me. I am using Eclipse Java EE IDE for Web Developers. Build id: 20090920-1017… >>> More
Hibernate unable to instantiate default tuplizer - cannot find getter

as seen on Stack Overflow - Search for 'Stack Overflow'
I'm trying to use Hibernate to persist a class that looks like this: public class Item implements Serializable, Comparable<Item> { // Item id private Integer id; // Description of item in inventory private String description; // Number of items described by this inventory item private int… >>> More
Problem connecting to Hsqldb via Hibernate when running a Eclipse GWT project.

as seen on Stack Overflow - Search for 'Stack Overflow'
Hi, I'm trying to run a simple GWT project where I'm trying to do a simple persitence via hibernate to a HSQLDB database. The database I'm using I have been using for at least 2 years with several osgi applications without any problems. So all I done is reused the same configuration and added a simple… >>> More
Hibernate : load and

as seen on Stack Overflow - Search for 'Stack Overflow'
According to the tutorial : http://jpa.ezhibernate.com/Javacode/learn.jsp?tutorial=27hibernateloadvshibernateget, If you initialize a JavaBean instance with a load method call, you can only access the properties of that JavaBean, for the first time, within the transactional context in which it… >>> More
Hibernate Exception, what wrong ? [[Exception in thread "main" org.hibernate.InvalidMappingException

as seen on Stack Overflow - Search for 'Stack Overflow'
I use netbean 6.7.1 to write "hello world" witch hibernate, but I get some errors, plz help me, thank you very much. my exception init: deps-module-jar: deps-ear-jar: deps-jar: Copying 1 file to F:\Documents and Settings\My Dropbox\DropboxNetBeanProjects\loginspring\build\web\WEB-INF\classes compile-single: run-main: Oct… >>> More

Related posts about entity

Entity Framework + AutoMapper ( Entity to DTO and DTO to Entity )

as seen on Stack Overflow - Search for 'Stack Overflow'
Hello. i got some problems using EF with AutoMapper. =/ for example : i got 2 related entities ( Customers and Orders ) and theyr DTO classes : class CustomerDTO { public string CustomerID {get;set;} public string CustomerName {get;set;} public IList< OrderDTO Orders {get;set;} } class… >>> More
What .Net Namespace contains Entity for use in a generic repository?

as seen on Stack Overflow - Search for 'Stack Overflow'
I have a question that I'm ashamed to ask, but I'm going to have a go at it anyway. I am creating a generic repository in asp.net mvc. I came across an example on this website which I find to be exactly what I was looking for, but there is one problem. It references an object - Entity - and I don't… >>> More
Entity Framework version 1- Brief Synopsis and Tips – Part 1

as seen on Geeks with Blogs - Search for 'Geeks with Blogs'
To Do Eager loading use Projections (for e.g. from c in context.Contacts select c, c.Addresses) or use Include Query Builder Methods (Include(“Addresses”)) If there is multi-level hierarchical Data then to eager load all the relationships use Include Query Builder methods like customers.Include("Order… >>> More
Hibernate unknown entity (not missing @Entity or import javax.persistence.Entity )

as seen on Stack Overflow - Search for 'Stack Overflow'
I've got a really simple class... import javax.persistence.Column; import javax.persistence.Entity; import javax.persistence.GeneratedValue; import javax.persistence.GenerationType; import javax.persistence.Id; import javax.persistence.Table; @Entity @Table(name = "users") public class User { … >>> More
Prevent Custom Entity being deleted from Entity Framework during Update Model Wizard

as seen on Stack Overflow - Search for 'Stack Overflow'
In Entity Framework v1 If you create a Custom Entity to map it to a Stored Procedure during FunctionImport and then Select "Update Model from Database" the Update Model Wizard removes the Custom Entity (as added Manually in the SSDL XML prior to functionImport) from the SSDL. Does anyone know if… >>> More