Hibernate Exception: Illegal attempt to associate a collection with two open sessions

That is the error that I have been trying to solve for the last two days and the solution turned out to be something very straight forward (and dare I say simple); the proper exception thrown was: org.hibernate.HibernateException: Illegal attempt to associate a collection with two open sessions.

Cause: It showed up when I attempt to update an element in a collection; adding to the collection was not a problem, hibernate mapping files are ok and everything else seemed to be in order but the error keeps turning up.

Solution: it turned out that I was preserving a value across requests whose presence cause a select statement to be executed before the update hence the exception.

Hmm … I can now get back to making some lightening fast progress.

  1. #1 by Emad on May 19, 2008 - 1:21 pm

    I get the same exception, and I do not understand what u mean by “it turned out that I was preserving a value across requests whose presence cause a select statement to be executed before the update hence the exception.”

    can u give more explanation ..it is my second day in this one

  2. #2 by yuguuk on May 20, 2008 - 9:09 pm

    A little context about the exception mentioned: I was using Hibernate, Spring and JSF. I was trying to update the collection using a JSF managed bean that has a request scope. Note that the hibernate data access object is managed by Spring hence is not (in my setup) part of JSF life cycle.

    So with the above scenario, the first request attaches the collection to a hibernate session, subsequent attempts to modify the collection threw up the mentioned exception.

    Changing the scope of the JSF managed bean seems to solve the issue.

    I hope this helps.

  3. #3 by jack on November 6, 2008 - 2:31 am

    still missing the explanation. I can say I solved something without saying how… that’s too easy…

  4. #4 by Ibrahim on November 24, 2009 - 1:43 pm

    I am using NHibernate2.1… i got solved this issue when i use session.Merge() instead of session.update()/session.SaveorUpdate()

    hope this heps some one..


    • #5 by Mrinmoy Chakraborty on December 24, 2015 - 8:02 am

      Thanks u very much.. Its works fine.

  5. #6 by Alex Grigoriadis on December 3, 2009 - 2:45 pm

    Ibrahim, this solution saved me, using merge instead of saveOrUpdate. I use zk + hibernate. I managed to make it work only when using lazy-loading = false. However, when I tried to use lazy loading, many exceptions occured: either two sessions were open, or there was no session at all. I really don’t understand the matter in depth, it has to do with sessions, threads and requests, but it is beyond my understanding for the moment.

    Thanks anyway

  6. #7 by reda on December 17, 2010 - 3:47 pm

    thanks Ibrahim.

  7. #8 by hassanko on January 21, 2011 - 12:27 am

    Ibrahim : ys3dak ma arw3ak

  8. #9 by Chuck on January 30, 2011 - 11:27 pm

    I am using NHibernate2.1… i got solved this issue when i use session.Merge() instead of session.update()/session.SaveorUpdate()

    It works for me, thank you very much.

  9. #10 by Chuck on January 30, 2011 - 11:29 pm

    I am using NHibernate2.1… i got solved this issue when i use session.Merge() instead of session.update()/session.SaveorUpdate()

    It works for me,
    Thank you very much.

  10. #11 by Fernando on May 21, 2011 - 6:21 pm

    Hey thanks a lot! i got solved when i changed to session.Merge() instead of session.saveOrUpdate too!

  11. #12 by jaideep on January 5, 2012 - 11:24 pm

    Hi All,

    Hibernate Exception: Illegal attempt to associate a collection with two open sessions

    Plz help me as soon as possible.I am also getting same exception when i am using a filter to close the session.Previously i was closing session in every methods but currently i am closing session using filter.I am getting this exception any time when saveOrupdate method is called or not also.

  12. #13 by Someone on January 7, 2012 - 5:38 am

    Thanks Ibrahim!

  13. #14 by Sergio Curay on January 15, 2012 - 11:02 am

    Hey men! this is awesome! thanks a lot!

  14. #15 by Javier on March 5, 2012 - 6:06 pm

    You have to check what it the CascadeType of your Object, you have to merge the object previously to persist or delete it.

  15. #16 by edu on November 13, 2012 - 7:08 pm

    Thanks Ibrahim. finally solved!!

  16. #17 by @bb on January 18, 2013 - 10:13 am

    im impliment Tread local in hibernate session managment ………. i face this like error
    Illegal attempt to associate a collection with two open sessions
    Please Help to fix this Problem

  17. #18 by http://tinyurl.com/pausguest47484 on February 5, 2013 - 4:12 pm

    Thanks for applying free time in order to create “Hibernate Exception: Illegal attempt to associate a collection with two open sessions imma”.
    Many thanks again -Bonnie

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    Wow, wonderful blog layout! How long have you been blogging
    for? you make blogging look easy. The overall look of your
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  19. #20 by lord on April 19, 2013 - 7:15 pm

    hi i don’t know how it work i have that problem in my class doa my class is
    public void ajouter(Universite univ) {
    Session session =HibernateUtil.getSessionFactory().openSession();
    try {

    } catch (Exception e) {
    System.out.println(“ereur dans l’ajout de universite:”+e.getMessage());


    public void modiefier(Universite univ) {

    Session session =HibernateUtil.getSessionFactory().openSession();
    try {
    //session.load(Universite.class, univ.getIdUniv());

    // session.saveOrUpdate(univ);
    } catch ( HibernateException e) {
    System.out.println(“ereur dans la mise a jour de universite:”+e.getMessage());

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  1. Common Hibernate Errors and Causes | Lam Nguyen’s Blog

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