Hibernate: org.hibernate.LazyInitializationException: could not initialize proxy - no Session [duplicate]

Answer 1

Your objects inside employee are lazy initialized. That's mean, they are initializing only on demand on non-closed session. So you have to initialize them all manually inside loop after fetching from DB:

Query empQuery = session.createQuery(hqlQuery);
empQuery.setMaxResults(maxResult);
employees = (List<Employee>) empQuery.list();
for (Employee emp : employees) {
    Hibernate.initialize(emp.address);
}

Answer 2

Has nothing to do with the mapping. When you provide for lazy loading on an object, you accept a responsibility that has bewitched the ORM world for a decade: that the session you loaded the object with will be the same one as the session that is present when the lazy requests are issued.

In your case, it looks like the session is completely gone.

You have to have some means of either maintaining the session (which often leads to a need for conversation scope, which would mean either Seam or CDI (in EE 6)) or you have to resync your object with the new session that you have (usually by looking it up again).

Answer 3

Sinche Hibernate 4.2 you can use

.setProperty("hibernate.enable_lazy_load_no_trans", "true");

this option solves the dreaded

org.hibernate.LazyInitializationException: could not initialize proxy -
no Session

which took so many hours of life to programmers away.

Answer 4

add laze=false into <class name="com.employees.model.Employee" table="employees"> or you can init your object in Hibernate.init(Object) when you get object from db