Hi,
it seems as if the lazy="false" property on a set mapping is not working in my mapping file.
I want to eager load a one-to-many relationship. I thought it would be enough to just set the lazy property to false.
Nevertheless I get a LazyInitializationException when I want to access the relationship set after the session is closed.
Any ideas what I do wrong? Do I really need to do an explicit left join fetch to eager load a relationship?
Hibernate-Version: 3.2.5.ga
Database: HSQL DB
Here my mapping file:
Code:
<hibernate-mapping >
<class name="crud.book.model.Publisher" table="PUBLISHER" schema="PUBLIC">
<id name="id" type="int">
<column name="ID" />
<generator class="assigned" />
</id>
<property name="name" type="string">
<column name="NAME" length="20" not-null="true" />
</property>
<set name="books" inverse="true" lazy="false" cascade="all" fetch="subselect">
<key>
<column name="PUBLISHER" />
</key>
<one-to-many class="crud.book.model.Book" />
</set>
</class>
</hibernate-mapping>
The query code:
Code:
SessionFactory sessionFactory = cfg.configure().buildSessionFactory();
Session session = sessionFactory.getCurrentSession();
org.hibernate.Transaction tx = session.beginTransaction();
try {
session = sessionFactory.getCurrentSession();
tx = session.beginTransaction();
Publisher loadedPublisher = (Publisher) session.load(Publisher.class, 1);
tx.commit();
//--> getting a LazyInitializationException here
Set<Book> books = loadedPublisher.getBooks();
} catch (Exception e) {
...
} finally {
...
}
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