spring - Mantain long Transaction Session in Spring3 and Hibernate4 -

i lazyinitializationexception shop.events collection in below scenario.

i know problem might transaction session closed before call shop.getevents executed.

i learning opensessioninviewfilter, think no idea mantain every transaction sessions in every calls life server. , fetchtype.eager not neither.

i need solve question. thank in advance.

@entity @table(name = "shop") public class shop implements serializable {      // class attributes.          @onetomany(mappedby = "shop", fetch=fetchtype.lazy)     private set<event> events;      // getters , setters.  } 

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@entity @table(name = "event") public class event implements serializable {      // class attributes.      @manytoone(fetch = fetchtype.lazy)     @joincolumn(name = "shop_id", nullable = false)     private shop shop;      // getters , setters.  } 

persistence layer implementation.

public interface abstractdao<e, extends serializable> {      e finduniquebycriteria(criteria criteria);  } 

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public interface shopdao extends abstractdao<shop, string>{      shop getshopfromid(int shop_id, int manager_id);  } 

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@repository("shopdao") public class shopdaoimpl extends abstractdaoimpl<shop, string> implements shopdao {      protected shopdaoimpl() {          super(shop.class);     }      @override     public shop getshopfromid(int shop_id, int manager_id) {          criteria criteria = this.getcurrentsession().createcriteria(shop.class)                 .add(restrictions.and(                 restrictions.like("active", true),                 restrictions.like("id", shop_id)))                 .createcriteria("manager").add(                 restrictions.like("id", manager_id));          return (shop) this.finduniquebycriteria(criteria);     }  } 

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public interface shopservice {      shop getshopfromid(int shop_id, int manager_id);  } 

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@service("shopservice") @transactional(readonly = true) public class shopserviceimpl implements shopservice {      @autowired     private shopdao shopdao;      @override     public shop getshopfromid(int shop_id, int manager_id) {          return this.shopdao.getshopfromid(shop_id, manager_id);     }  } 

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controller this.

class attributes.

@autowired private shopservice shopservice; 

method controller.

manager manager = (manager) request.getsession(false).getattribute("manager");  shop shop = (shop) this.shopservice.getshopfromid(shop_id, manager.getid());  set<event> events = shop.getevents(); 

solution configure controller method @transactional(propagation = propagation.required). thereby use same transaction session in method persistence operations.