الجافا بينز JAVA Beans

One benefit of it is that you can use it to send data between JSP files, instead of sending it using only parameters. This will make your code tidy and more readable.

If your JSP file has to do a lot of logic processing, you can move a part of you code into a bean, and let JSP file just for viewing. This enables you to logically divide your project into View, Model and Control. A thread on this forum has been talking about what is called MVC, Java Beans has an important role in that design.