Java EE changes design pattern implementation
summary
Java EE replaces handwritten pattern plumbing with CDI and annotations: the singleton becomes @Singleton with optional @Startup, @DependsOn, container or bean‑managed concurrency via @Lock and timeouts; the factory role is handled by CDI qualifiers and producer methods that can produce lists and use request/session/application scopes; facades map to @Stateless beans with pooling and transactions; decorators use @Decorator and @Delegate (ordering via priority or XML in CDI 1.1); events use CDI observers (sync by default, async in CDI 2.2). Lower boilerplate but higher risk of overuse.
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chapters (11)
- 0:00Introduction and context
- 2:36History and concepts
- 6:28Dependency injection
- 9:43Singleton pattern
- 14:30Managing concurrency
- 20:07Factory pattern
- 26:19Producer methods
- 30:23Facade pattern
- 35:34Decorator pattern
- 38:15Observer pattern
- 42:32Conclusion
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