Microservices are a software architectural style in which a large application is built as a collection of small, independent services that communicate with each other over a network.
Each service is a self-contained unit of functionality that can be developed, tested, and deployed independently of the other services. This allows for more flexibility and scalability than a monolithic architecture, where all the functionality is contained in a single, large codebase.
Why Choose Microservices: -
Scalability: Each microservice can be independently scaled based on its own resource needs.
Flexibility: Different services can be built using different technologies, as long as they can communicate over standard protocols like HTTP or messaging queues.
Resilience: Failures in one service do not necessarily affect others, promoting fault isolation.
Continuous Delivery: Services can be deployed independently, enabling faster updates and reduced time-to-market.
Getting Started with Java and Spring Boot: -
Development Environment :-
Java 8 and above
Eclipse IDE
Spring initializer (used for creating boilerplate code for Spring boot Development)
Setting Up a Spring Boot Project
Spring Boot provides a quick and easy way to create microservices in Java. You can start by setting up a new Spring Boot project using Spring Initializer.
Configure Your Project:-
Project:- Select the type of project you want to create. For this example, choose `Maven Project`.
Language:- Choose `Java`.
Spring Boot:- Select the latest stable version.
Project Metadata:-
Group: This is typically your organization’s domain (in reverse).
For Example, ‘com.tdt’.
Artifact: This is the name of your project. For instance, ‘My-First-App’.
Name: A human-readable name for your project, e.g., `My-First-App`.
Description: A brief description of your project.
Packaging:- Choose `Jar` unless you have a specific need for a different packaging type.
Java Version:- Select the appropriate version of Java for your project.
Dependencies:- Add require dependencies Example :- spring web ,spring data jpa ,developer tool etc.
Generate the Project:-
After configuring your project, click on the “Generate” button.
This will create a zip file containing your Spring Boot project.
Extract and Import into IDE:-
Extract the downloaded zip file to a location of your choice.
Open your preferred Integrated Development Environment (IDE).
Import the project into your IDE.
Explore Your Project(Project structure):-
Once imported, you’ll see the project structure. Key files and folders include:
`src/main/java`: This is where your Java source code resides.
`src/main/resources`: Configuration files, static resources, and templates go here.
`src/test`: Contains test cases.
`pom.xml`: The Maven configuration file where you can manage dependencies and plugins.
3. Implementing Microservices
Once your project is set up, you can define your microservices.
Now start the coding: - You can create controllers, services, repositories, and entities based on your project’s requirements
Each microservice typically consists of:
Service Layer: Implements the business logic.
Repository Layer: Interacts with the database or other data sources.
Controller Layer: Defines the API endpoints.
4. Communication Between Microservices
Microservices communicate with each other through well-defined APIs. You can use tools like RESTful APIs over HTTP protocols.
5. Running Spring boot Application
To run your Spring Boot application, look for the main application file (usually named `Application.java`) and run it as a Java application.
Application run on default:-http://localhost:8080
6. Deployment of Microservices.
Microservice executable is a JAR file and deploy on server independently.
Conclusion: -
Microservices architecture with Java and Spring Boot offers a powerful way to build scalable and resilient applications. Microservices are designed to be loosely coupled, meaning that changes to one service should not affect the other services. This makes it easier to update, maintain, and scale the application.
Microservices architecture is best suited for large and complex applications that need to handle a high volume of traffic and be scaled horizontally.
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