[SOLVED] Java EE 6 Design Patterns

Java EE 6 Design Patterns

I would like to know about the design patterns that can be applied in Java EE 6 implementation.

MVC.
GOF.
DAO
Persistent relational mapping
Pooling
CEC
Entity control boundary (ECB)
and many others

Do JPA eliminate the use of DAO?
Please provide other patterns that can be learned.

Solution

If you use Java EE 6 (not Java EE 5), then some of technical J2EE patterns are not needed anymore for the task they are used in J2EE.

For example, use injection instead of ServiceLocator.

@See http://pawelstawicki.blogspot.com/2010/07/review-real-world-java-ee-patterns.html

GOF patterns still required, because they are not (only) related to Java EE.

In general: Patterns have an intend: they want to produce a solution/best practice for an problem, with a given set of functionality that is proviced by the environment (In your case: it is Java, Java EE 6, ...)

If the problem is gone a way: you do not need the pattern anymore
If the environment has changed since the pattern is fond, then you have to rethink the pattern, because may the problem is gone (first point), or there is now a better way the handle the problem.