java - JSF + Hibernate: Collection is not associated with any session -

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first of all, use java ee, hibernate entitymanager , primefaces.

i have 1 ejb module (business logic , domain) , 2 war modules (jersey ws , jsf primefaces).

i decided initialize lazy collections in jsf war module avoid lazy initialization exception. don't use extended entity manager.

@managedbean(name = "company") @sessionscoped public class companybean {      @ejb     private companyfacade cf;      ...      public string showdetails(long id) {         company = cf.find(id);         hibernate.initialize(company.getcompanytypes());         hibernate.initialize(company.getprimaryuser());         hibernate.initialize(company.getblocked());         hibernate.initialize(company.getaddresses());         hibernate.initialize(company.getcontacts());         return "details";     }      ... }

and get:

caused by: org.hibernate.hibernateexception: collection not associated session @ org.hibernate.collection.abstractpersistentcollection.forceinitialization(abstractpersistentcollection.java:474) @ org.hibernate.hibernate.initialize(hibernate.java:417) @ minepackage.companybean.showdetails(companybean.java:79) ...

i don't understand it. there has session when 1 line before initialization fetched database, doesn't it? initialize attributes in ws module in similar way , there it's working.

any idea what's happening?

i think session closed after ejb finished, objects in detached state. hibernate.initialize() won't work more. have multiple options here:

  • open transaction on client side (in jsf bean or in servlet filter). way session still open when calling hibernate.initialize().
  • modify ejb load full object , required collections. use fetch joins and/or use hibernate.initialize() there.
  • create more fine grained api in ejb. method companyfacade.getaddressesbycompany().

i prefer combination of latter two. use fetch joins load one-to-one , many-to-one relationships in find method , add methods loading one-to-many collections (like addresses). improve performance of backend because reduces number of database queries.


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