What is Java EE?

J2EE - Java 2 Platform Enterprise Edition

graph TB
    A[Client-Side Presentation] --> B[Server-Side Presentation];
    B --> C[Server-Side Business Logic];
    C --> D[Database]; 

Overview of Spring

Goals

• Lightweight development with Java POJO(Plain-Old-Java-Objects)
• Dependency injection to promote loose coupling
• Declarative programming with Aspect-Oriented-Programming
• Minimize boilerplate Java Code

Spring Core Framework

Core Container

Creating beans and making these beans available.

• Bean Factory - Create Beans and manage beans
• Context - Spring Container that holds the beans in memory.
• SpEL - Spring Expression Language

AOP Section

AOP: Aspect Oriented Programming

Allows you to create application-wide services.

Add functionality to object without modifying your code using config file or by adding annotations.

Logging, security, transactions, etc..

Data Access Layer

• JDBC - helper classes
• ORM - Objection Relational Mapping - hook in to Hibernate
• Transactions - Add transaction support
• JMS - Java Message Service - Send msgs to a msg queue in a asych way.

Web Layer

Home of the Spring MVC framework

Test Layer

Supports Test-Driven-Development

Mock objects and out-of-container testing.

Integration test as well.

Spring Projects

Additional modules built on top of the core Spring Framework.

• Spring Cloud, Spring Data
• Spring Web Service - RESTful

Reference: Udemy, Spring & Hibernate for Beginners (including SpringBoot)