Dynamically adding entities to hibernate

Question

How can we add more entities to hibernate? Mine is a standalone application built on spring and hibernate.

I have the metadata about the class file of the new entities. How can I add them to hibernate session factory without restarting or making changes to the confugation XML files?

All the mappings are managed by hibernate itself. And only the configurations like connection parameters are maintained in XML.

In short, if I have the class file location of the entities, how can I instruct hibernate to pickup the entities from there, without restarting or making changes to the config files?

Thanks.

Hi, did you get it working? I'm trying it so far and no success :( — Saram
– Saram, Commented Nov 18, 2013 at 13:48

Edward Samson · Accepted Answer · 2012-07-21 03:52:32Z

3

From the Hibernate docs:

The internal state of a SessionFactory is immutable. Once it is created this internal state is set. This internal state includes all of the metadata about Object/Relational Mapping.

What you could do is have a separate SessionFactory for each set of dynamically loaded entities. Create a Configuration and add your new classes to it. Use that to create a new SessionFactory or EntityManagerFactory.

answered Jul 21, 2012 at 3:52

Edward Samson

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2 Comments

promaxdev Over a year ago

If I go for creating separate session factories, how the connection and transaction management will be affected? Will this approach need restart of the application?

Edward Samson Over a year ago

I expect that SessionFactories will have independent connections and transactions. As far as restarting your application, I don't think that would be necessary.

Seba Cervantes · Accepted Answer · 2018-09-09 20:41:49Z

3

The way to do this is like the following:

Configuration configuration = new Configuration().configure("hibernate.cfg.xml"); // base configuration

configuration.addAnnotatedClass(MyClass1.class); // @Entity classes
configuration.addAnnotatedClass(MyClass2.class);
configuration.addAnnotatedClass(MyClassN.class);

Session session = configuration.buildSessionFactory().openSession();
// Work with session...

answered Sep 9, 2018 at 20:41

Seba Cervantes

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