Develop Reference

Hibernate session.update/session.delete does not work

code:
public void test() {
Session session = sessionFactory.openSession();
User u = new User();
u.setUsername("user1");
session.delete(u);
session.close();
}
I want to know why deletion does not work

try before session.close()
session.flush()

You are trying to delete non-managed entity that is not attached to session. In order to manipulate entity you should first attach it to session:
User u = (User) session.get(User.class, 1L);
session.delete(u);
Above is this sample of loading by id, so if you are restricted to username you have to write a more complex query.

org.hibernate.cache.impl.bridge.RegionFactoryCacheProviderBridge.nextTimestamp

Please Help:
Below error when I tried to add details to tables using hibernate:
NullPointerException
org.hibernate.cache.impl.bridge.RegionFactoryCacheProviderBridge.nextTimestamp(RegionFactoryCacheProviderBridge.java:93)
SessionFactoryImpl.openSession(SessionFactoryImpl.java:639)
SessionFactoryImpl.openSession(SessionFactoryImpl.java:648)
com.package1.service.AuthenticateUser.addUser(AuthenticateUser.java:32)
com.package1.controllers.LoginServlet.doPost(LoginServlet.java:68)
AuthenticateUser:
public class AuthenticateUser {
public void addUser(String uname, String uemail, String usrnme,
String upass) {
Session session = factory.openSession(); //Line No:32
Transaction txn = session.beginTransaction();
user.setName(uname);
user.setEmail(uemail);
user.setUsrname(usrnme);
user.setPassword(upass);
txn.commit();
session.save(user);
session.close();
factory.close();
}
private static SessionFactory factory = HibernateSessionManager
.getSessionFactory();
private User user = new User();
}
In LoginServlet I call
authenticateUser.addUser("abcdef", "abcdef","abcdef", "abcdef");

You are closing the factory object, so attempting to open a session with it has chances to cause such a crash (on next call).
Remove this line :
factory.close();

Try to convert this order:
txn.commit();
session.save(user);
Like this:
session.save(user);
txn.commit();

this error ocurrs when you try to create an EntityManager with a closed EntityManagerFactory.
So, the recomandation is,
EntityManagers must be ephimerals *create and close only in the scope of the transaction.
EntityManagerFactory must be application scoped.
NullPointerException
org.hibernate.cache.impl.bridge.RegionFactoryCacheProviderBridge.nextTimestamp(RegionFactoryCacheProviderBridge.java:93)

Spring Hibernate getCurrentSession() delete not working

I am fully testing an entity on my unit test, and almost everything worked so far: create, update, list. However, when I try to delete a record, it is not getting deleted. Here is the code I am using:
public void delete (Integer id) {
// This doesnt work even though I know user is set and id is not null
User user = find(id);
getSession().delete(user);
// This will work
// Query query = getSession().createSQLQuery("DELETE FROM users WHERE id = " + id);
// query.executeUpdate();
}
private Session getSession() {
if (session == null) {
try {
session = SessionFactoryUtils.getSession(sessionFactory, Boolean.TRUE);
TransactionSynchronizationManager.bindResource(session.getSessionFactory(), new SessionHolder(session));
} catch (Exception e) {
session = SessionFactoryUtils.getSession(sessionFactory, Boolean.FALSE);
}
}
return session;
}
If I execute the query directly it works but using the delete() method doesnt. I think it may be related to committing the transaction but I already tried something like that and no luck. Any ideas?

I found the problem with this one.
First, find() method was evicting my user model, and probably taking it out of the session.
After delete(), I also needed to session.flush()

Hibernate table update error

My web application used hibernate mysql. I can add records to database without having any issue. But if i going to update latest adding record It will not updating. But if I re-start the server(tomcat) and then try to update It's working.
To update the record following condition should be satisfied.
//Check record aready exist
public boolean idExists(String id) {
Session session = (Session) HibernateUtil.getSessionFactory().getCurrentSession();
session.beginTransaction();
List<Officer> list = (List<Officer>) session.createQuery("from Officer as p where p.idno =" + "\'" + id.trim() + "\'").list();
return (list.size() > 0) ;
}
Immediate(return 1) adding records It will returns 0. But one restart the server and update the record It will work. I also verify after adding record it's successfully commit to DB.
public class HibernateUtil {
private static final SessionFactory sessionFactory;
static{
try{
sessionFactory = new AnnotationConfiguration().configure().buildSessionFactory();
}catch(Throwable ex){
System.err.println("Initial SessionFactory creation failed." + ex);
throw new ExceptionInInitializerError(ex);
}
}
public static SessionFactory getSessionFactory() {
return sessionFactory;
}
}
Let me know if something wrong in my code?

Hibernate does not interact with database immediately after transaction or it does at the time of flushing session, it manages and updates its record to increase system performance in its own way, If you want immediate reflection use :
session.flush();
After updating records.

You could try to flush the session. Entities are not immediately persisted into the database.
session.flush();

I think better you use Transactions here.
You put session.biginTranasaction();
Instead do something like,
public boolean idExists(String id) {
Session session = (Session) HibernateUtil.getSessionFactory().getCurrentSession();
Transaction tx = session.beginTransaction();
List<Officer> list = (List<Officer>) session.createQuery("from Officer as p where p.idno =" + "\'" + id.trim() + "\'").list();
tx.commit();
if(session != null){
session.close();
}
return (list.size() > 0) ;
}
On other end you should generate new session and do other stuffs.

hibernate Open Session in View

i am using the following approach to sole lazy initialization problem in hibernate.Pleas tell me whether it will work or not .
I have to implement my transcation in my persistance layer compulsary due to some reasons.
public class CourseDAO {
Session session = null;
public CourseDAO()
{
this.session = this.session = HibernateUtil.getSessionFactory().getCurrentSession();
}
public Course findByID(int cid){
Course crc = null;
Transaction tx = null;
try {
tx = session.beginTransaction();
Query q = session.createQuery("from Course as course where course.cid = "+cid+" ");
crc = (Course) q.uniqueResult();
//note that i am not commiting my transcation here.Because If i do that i will not be able to
//do lazy fetch
}
catch (HibernateException e)
{
e.printStackTrace();
tx.rollback();
throw new DataAccessLayerException(e);
}
finally
{
}
return crc;
}
}
and in the filter i am using the folling code
session = HibernateUtil.getSessionFactory().getCurrentSession();
if(session.isOpen())
HibernateUtil.getSessionFactory().getCurrentSession().getTransaction().commit();
IS this approach right??
Can it can have any problem

could you explain why do you need to have ur transactions in ur repositories? the problem there is that they are going to be so fine-grained, so you are not gonna get any advantage from the session caching
then you are opening the transaction there but closing it in your filter. what happens if you access multiple repositories in your service? Maybe i am not understanding what you mean but i think you need to re-think the reasons that force you to manage your transactions in your repositories

When do you create you CourseDAO? If it is a singleton bean or something else that lives longer than a page view, it will need to keep a SessionFactory and generate a new Session when it needs one rather than keeping a Session.