Spring Framework: Today's Topics

• Why Spring?
• What is Spring?
• Dependency Injection (DI) / Inversion of Control (IoC)
• Spring Bean Life Cycle
• Bean Wiring

1. Why Spring?

1. Simplifies Overall Java Development: Streamlines the development process.
2. Loosely Coupled Applications: Spring manages dependencies, ensuring dependent objects are completely decoupled from their dependencies.
3. Design Pattern Implementation: Supplies ready-made implementations of design patterns (e.g., Singleton, Factory, Proxy, MVC, Front Controller, and many more).
   • Supports the MVC pattern for developing monolithic web applications and RESTful web services.
4. Reduces Boilerplate Code: Minimizes repetitive code.
5. Easy, Simple, and Lightweight Applications: Facilitates building lightweight applications.
6. JDBC and ORM Support: Offers excellent support for JDBC and ORM, along with automatic transaction management.
7. Modular and Non-Intrusive Design: Promotes modularity without invasiveness.
8. Framework Integration: Provides smooth integration with frameworks like Hibernate, Struts, and EJB.
9. Aspect-Oriented Programming (AOP): Supports AOP for separating and modularizing cross-cutting concerns (repetitive tasks) from core tasks.
   • Examples: Request handling logic (Controller bean), Business Logic (Service bean), Data Access Logic (DAO).
10. Testing Support: Supports unit testing and integration testing.
11. Web Application and RESTful Services: Simplifies developing and securing web applications and RESTful web services.
12. Microservices Architecture: Excellent support for building microservices-based architecture.