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[b]Hibernate version:3.0[/b]

[b]Mapping documents:[/b]

[b]Code between sessionFactory.openSession() and session.close():[/b]

[b]Full stack trace of any exception that occurs:[/b]

[b]Name and version of the database you are using:[/b]

[b]The generated SQL (show_sql=true):[/b]

[b]Debug level Hibernate log excerpt:[/b]


Should we always need to have an empty constructor in our POJOs. If yes, why?

thanks in advance

Yes, you do. Othewise, how would Hibernate create an instance of you object? Hibernate uses the following to create a transient instance:

Class cls = Class.forName("<name-of-class>");
...
Object obj = cls.newInstance();

In order to be able to run cls.newInstance(), there must be an empty constructor.

Actually, you either need an empty constructor or provide an Interceptor implementation that knows how to construct your objects.

I believe you'll also run into issues if you attempt to proxy an object that doesn't have a default constructor.