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Understanding Spring Framework Architecture (Version 3)

Spring Framework 3.0 was a major landmark release in the Java ecosystem. It introduced full support for Java 5 features like generics, varargs, and annotations, along with introducing the standalone Spring Expression Language (SpEL) and REST support in Spring Web MVC.

1. Core Container & Spring Expression Language (SpEL)

The Core Container in Spring 3 is organized into clear, focused modules:

• Core & Beans: Supply fundamental Inversion of Control (IoC) and Dependency Injection (DI) features.
• Context: Builds upon Core and Beans, supporting enterprise services like JNDI, EJB, and validation.
• Expression Language (SpEL): A dedicated language module for querying and manipulating bean properties, executing methods, and handling collection projections dynamically.

2. AOP & Instrumentation

Aspect-Oriented Programming support ensures clean decoupling of application logic:

• Spring AOP: Enables declarative cross-cutting services such as security, auditing, and transactions.
• AspectJ Integration: Full compatibility with AspectJ syntax and annotation models.
• Instrumentation: Class instrumentation and classloader enhancements for enterprise runtime environments.

3. Data Access & Integration

Spring 3 modularized data access tools to keep project dependencies minimal:

• JDBC: Clean abstractions over raw JDBC to remove boilerplate code and map exceptions consistently.
• ORM: Integration modules for JPA, Hibernate, and JDO.
• OXM & JMS: Object/XML mapping abstraction (JAXB, Castor, XMLBeans) and robust Java Message Service integration.
• Transactions: Programmatic and declarative transaction management.

4. Modern Web Tier & REST Support

The Web layer in Spring 3 revolutionized web application development:

• RESTful Web Services: Built-in annotations like @PathVariable and RestTemplate for building and consuming REST APIs.
• Servlet & Portlet: Comprehensive MVC architecture for browser and portal applications.

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Spring Architecture_V3 | Spring Tutorial | Spring basics | Spring Framework

Spring Architecture_V3 | Spring Tutorial | Spring basics | Spring Framework

Spring Architecture_V3 | Spring Tutorial | Spring basics | Spring Framework

Spring Architecture_V3 | Spring Tutorial | Spring basics | Spring Framework

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