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Spring Boot tutorial

  1. this is a java framework to run java applications .
  2. main use: it simplifies configuration and setup process.
  3. `Spring boot is a module of the Spring framework' .
  4. Spring framework --> then SpringBoot.

Spring : lightweight , open source, also called a framework of frameworks.

  1. Spring Framework

“A comprehensive and versatile platform for enterprise Java development.”

•	Think of it as the skeleton or foundation for building Java apps.
•	It provides all the tools and features to build large-scale, high-performance apps.
•	It’s modular—you use only what you need (like plug-and-play 🔌).

🧠 Example: Need to connect to a database? Use Spring Data. Want to build APIs? Use Spring MVC. You’re in control.

Spring Basics.

Keywords

  • Spring Java framework for building apps
  • IoC Framework manages object creation
  • DI Inject dependencies instead of manually creating them
  • Spring MVC Build APIs / web apps
  • Spring Boot Spring but easier, faster
  • Spring Security Protect routes and handle login
  • Spring Data Easy database operations
  • Spring Cloud Tools for microservices
  • Microservices Small, independent services working together

features.

  1. Full scale application development
  2. it has features like
  3. Inversion of control: framework controls the flow , we don't need to create and manage objects.
  4. Dependency Injection : this injects the dependencies our class needs
  5. Spring MVC : “Model-View-Controller for building web applications.” > for web development.
  6. spring security : auth and autorization
  7. spring data , spring cloud for microservices

Why to use Spring?

  • When it comes to size and transparency, Spring is a featherweight. Spring framework's basic version is about 2MB in size. The Spring Framework's core capabilities can be used to create any Java program

what are modules in spring :

  1. think of them as a subprojects or toolkits inside the spring framework.
  2. each part in spring contains it's own modules inbuilt .
  3. each solves a specific problems.

applications

  • pojo based : plain old java object
  • POJO = Plain Old Java Object : a java class with private variables and public getters , setters .
  1. why is this used ?
  2. Spring is designed to be non-invasive, meaning it lets you write normal Java classes (POJOs) and still manage them through features like: • Dependency Injection (DI) • AOP (Aspect-Oriented Programming) • ORM (with JPA/Hibernate) ** So instead of forcing you to extend framework-specific classes like in other frameworks…

🔁 Spring lets you build apps using POJOs that you annotate, and Spring wires them up behind the scenes. **

  1. Modular : modular approach .
  2. integration with the existing framework: use of existing frameworks to use .
  3. Testability : Because Spring manages all the setup, and your logic lives in clean little Java classes (POJOs), you can test easily without worrying about real databases, APIs, or other junk.