In the comments to my post Hibernate an ORM Framework, I received two questions from reader

Difference between POJO and Java Bean
Performance issue with respect to the application server

Difference between POJO and Java Bean
A Javabean is a class which exposes private properties by public getters and setters, has at least a (implicit) no-arg constructor, must [...]

Databases are complex to implement. This is especially true when components of a database based on two different approaches (i.e. object oriented vs. relational) must interact with each other.
To make a long story short, when a component based on one kind of approach (e.g. object oriented) tries to interact directly with another object having its roots [...]