A Java Bean is a POJO that is serializable, has a no-argument constructor, and allows access to properties using getter and setter methods.
An Enterprise Java Bean is not a single class but an entire component model (again, EJB 3 reduces the complexity of Enterprise Java Beans).
In order to function as a Java Bean class, an object class must obey certain conventions about method naming, construction, and behavior.
These conventions make it possible to have tools that can use, reuse, replace, and connect Java Beans.
Here you will see how to add logging of method calls with Spring.
If you are concern if introducing of Spring AOP decrease performance, as you are adding overhead to execution of all your service calls, check this blog post.So we gave them one, and it's caught on very nicely." The term continues the pattern of older terms for technologies that do not use fancy new features, such as POTS (Plain Old Telephone Service) in telephony, and PODS (Plain Old Data Structures) that are defined in C but use only C language features, and POD (Plain Old Documentation) in Perl.The term has most likely gained widespread acceptance because of the need for a common and easily understood term that contrasts with complicated object frameworks.A general heuristic is that value objects should be entirely immutable.If you want to change a value object you should replace the object with a new one and not be allowed to update the values of the value object itself - updatable value objects lead to aliasing problems.