This document provides an overview of Spring fundamentals including dependency injection, the Spring IoC container, bean configuration, bean scopes, the bean lifecycle, AOP with Spring, testing with Spring, and topics beyond the Spring basics. It discusses how Spring addresses common problems developers face through its features like dependency injection and aspects.

1. Spring Fundamentals Doing it right ….inversely

2. Agenda Why DI and SL vs DI. Dependency injection and The Spring IoC container Various approaches of Bean Configuration Bean scopes Bean Lifecycle AOP with Spring Spring AspectJ integration Testing with Spring Beyond Spring Basics

3. Building OO systems Its all about Objects Its all about Instantiating objects Its all about communicating between the objects Its all about collaborating objects Its all about managing objects Its all about extending objects Its all about monitoring objects

4. But the problem is Everything done By Developer

5. What developers end up Writing to much boilerplate Coding the same patterns again Duplications Managing infrastructure Entangled interfaces Complicated Dependencies

6. End up spending time

7. You eventually end up with

8. S.O.L.I.D The Single Responsibility Principle The Open Closed Principle The Liskov Substitution Principle The Interface Segregation Principle The Dependency Inversion Principle

9. SRP: class should have one, and only one, reason to change

10. OCP: extend a classes behavior, without modifying it

11. LSP - Derived classes must be substitutable for their base classes

12. ISP: Make client specific fine grained interfaces

13. DIP: Depend on abstractions, not on concretions

14. DI Approaches Pre DI Construction by hand Factory Pattern Service Locator

15. DI Frameworks Hollywood principle Objects are handed to you New and Factories - Not your concern Well managed Beans First class Bean scope support No/less boilerplate Testability dependency Injector dependency Client

16. Spring Framework

17. Spring IOC Container Instantiates Beans Assembles Beans Manages Beans Configure dependencies Injects dependencies

18. Containers heirarchy

20. Beanshell

22. Bean scopes Singleton Prototype Request Session Global Session Supports Custom Scopes

23. Bean Lifecycle

24. Lifecycle method calls

26. Proxy Pattern “provide a surrogate or placeholder for another object to control access to it “ [GOF 94]

27. Manifestation of proxy Virtual proxy Remote proxy Security proxy Smart Reference proxy

28. Decorator Pattern “Allows new/additional behavior to be added to an existing class dynamically” [Wikipedia]

29. Decorator manifestation //Construct the BufferedInputStream object bufferedInput = new BufferedInputStream(new FileInputStream(filename));

30. Graduate to AOP Enforce inheritance to achieve concern of separation? Specification like EJB have weird inheritance, your class never implement your interface ..huh Why not use POJOs and apply CCC on them thru runtime magic ?

31. OOP vs AOP

32. AOP Lingo and Jargons Aspect – The CCC that can be modularized Advice – Functionality of an Aspect (logging) Jointpoint – Opportunities in program execution to apply advice Pointcut – Exact jointpoint where advice are weaved Weaving :linking objects with other applicatin objects

33. Spring AOP Supports only method join points Supports only load-time weaving Advise types Before Around After –returning After–throwing After – finally

34. Spring @AspectJIntegration Annotation based support as of AspectJ 5.x @Aspect @Pointcut @ execution @ within @ target @annotation

35. AOP applications Trace aspect Performance monitoring aspect Auditing aspect Transaction managementaspect Logging aspect Security aspect Caching aspect

36. Testing with Spring Support for Unit and integration testing Support JUnit 3.8.x/4.x and TestNG. Readymade mocks for most JEE dependencies like JNDI, Servlet API, etc Spring TestContextFramework Supports Fixture wiring transparently Support bean caching Transaction management Extensive spring-specific support

37. Beyond Spring basics Spring MVC Spring DAO Spring ORN Spring JEE (JMS/JCA/JMX/Remoting) Spring Web flow Spring ROO Spring Integration Spring Security

38. Books

39. Did you get it