Spring, Hibernate, and the boundaries of Value Object pattern

In software development, it is always a question of validation and correct data handling. If you execute a business operation with incorrect input data passed by the user, the consequences can be disastrous.

The speaker will tell:

1. What is Value Object pattern?
2. How to implement it in your Spring/Hibernate application?
3. What world experts of IT industry think about Value Object?
4. Sometimes Value Object applying makes your code harder to evolve according to new business requirements. What are these cases?