How to make a Hello World in Java

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Goal: Create a Basic Web Server in Spring Boot

According to this All we have to do it go to this website

I think gradle and maven are package managers like npm in Javascript

My friend Gulshan says use maven

Project Structure : Explained by Chat-gpt

src/
│
├── main/
│   ├── java/
│   │   └── in/
│   │       └── abhi8290/
│   │           └── helloworld/
│   │               ├── HelloWorldApplication.java
│   │               └── HelloController.java
│   │
│   └── resources/
│       ├── static/
│       ├── templates/
│       └── application.properties

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🔍 Detailed Breakdown

📁 src/main/java/in/abhi8290/helloworld/

Your Java source code lives here.

• ✅ HelloWorldApplication.java

  • The entry point of your Spring Boot app.
  • Contains the main() method.
  • Annotated with @SpringBootApplication.

• ✅ HelloController.java

  • A REST controller that maps HTTP routes (like /) to Java methods.
  • Annotated with @RestController and uses @GetMapping.

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📁 src/main/resources/

This is where non-Java files like configuration and static assets go.

📄 application.properties

• Configuration file.
• You can define:
  • Server port: server.port=8081
  • DB connection settings
  • Logging levels, etc.

📁 static/

• Anything here is served as static files (like index.html, CSS, JS, images).
• Example: static/style.css → served at http://localhost:8080/style.css

📁 templates/

• For dynamic HTML templates using Thymeleaf, FreeMarker, etc.
• Used if you’re building server-side rendered HTML instead of just APIs.
• Example: templates/index.html

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🧠 Spring Boot Knows This Convention

Spring Boot automatically looks for files and routes in these locations:

• Controllers: under java/...
• Static files: in resources/static
• HTML templates: in resources/templates
• Configs: in resources/application.properties

This is called convention over configuration — you don’t need to tell Spring Boot where things are if you follow this structure.

Questions :

• How to arrange the files and folder in java
  • Project Structure in Java Spring Boot