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Chapter 11: Observer Pattern

In this chapter we show how to implement the observer pattern in Java SE and how the observer pattern works in the real world.

We then show how to implement the observer pattern in Java EE by using the @Observes annotation and Event firing.

We finish by showing how to use qualifiers to gain fine‐grain control over observers and how to implement transaction‐sensitive observers and rollbacks.

Professional Java EE Design Patterns

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