3 Replies Latest reply on Jan 16, 2006 10:33 AM by Cyril JOUI

    FetchType.Lazy

    Fabrice Clari Newbie

      Hi everybody,

      One more question on that topic, sorry, but I did not find any -positive- solution to my issue.

      I have an entity bean, Employee. Employee has an Address (@OneToOne relation, CascadeType set to All) with FetchType set to Lazy (because when I browse the employees list I do not want to have all the addresses and countries loaded).

      When trying to update the address (through a session bean) on an Employee instance, I got an exception saying: "LazyInitializationException: could not initialize proxy - no session".

      I understood from the previous posts on that topic that this can only be done in a local context; this is my case: a webapp inside JBoss (4.0.3sp1) accesses session beans on the same server (through context.lookup(MyBean.class.getName())). Furthermore, I am looking for a solution with the FetchType set to Lazy.

      Any help will be greatly appreciated since I got lost in the EJB3 Jungle... Tarzan, Jane, are you there ?? ;-)

      Thanks and best regards,
      Fabrice.

        • 1. Re: FetchType.Lazy
          Cyril JOUI Newbie

          Hello !

          You must explicitly initialize your object before returning it to your webapp !
          You can do this just with calling the size() method of your collection !

          Of course it would be easier if you use the Facade Pattern with a Session Bean !

          for example (in the session bean)

          public Employee findEmployee(int id) {
           Employee employee = employeeDao.findEmployeeById(id);
           // this line initialize address collection
           // be careful if the collection == null !!!
           employee.getAddress().size();
          }
          


          I hope it would be easier for you ;)

          Good luck

          • 2. Re: FetchType.Lazy
            Fabrice Clari Newbie

            Hi Cyril,

            Many thanks for your answer.
            One precision: do I need to do the same thing in case of a Collection? eg inside the session, I have Collection getAllEmployee(). I tried to make a loop on that collection and initialize the address for each employee but it does not work (but it worked for getEmployeeById()). Is is normal?

            Once again, thanks for your help.
            Regards,
            Fabrice.

            • 3. Re: FetchType.Lazy
              Cyril JOUI Newbie

              Hello,

              By default, the OneTOne and OneToMany is loaded automaticaly.
              Collections are automaticly in the lazy mode !

              If you have a Collection of User and a User has a Collection of resources and a Resource has a collection of Category (for example).
              You must initialize the collection of resources and for each Resource you have to initialize the collection of Category.

              Do you see ? ;)