41. Spring Framework Review

Introduction to Spring Framework

Overview:

Open-source framework for Java enterprise applications.

Known for flexibility, modularity, and scalability.

Evolution:

Early Days (2003): Alternative to Java EE complexity.

JEE and EJB Context (2004 - 2005): Addressed drawbacks of Java EE and EJB.

Spring 2.0 (2006): Supported Java EE 5 features.

Java EE 6 and Spring 3.0 (2009): Embraced annotations and simplified configurations.

Java EE 7 and Spring 4.0 (2013): Aligned with Java EE 7 release.

Current State (2023): Coexists with Jakarta EE, expanded beyond Java EE.

Key Concepts:

IoC and DI for flexible control flow.

AOP for modularizing cross-cutting concerns.

Data Access and ORM for clean database interactions.

Transaction Management for simplicity and control.

Application Messaging:

Messaging abstraction for event-driven apps.

Message-driven POJOs and integration with brokers.

MVC for Web Applications:

Controller handling user requests.

Model holding data and business logic.

View presenting data to users.

DispatcherServlet and HandlerMapping for request handling.