Best Practices For Structuring Spring Boot Application

A well-structured Spring Boot application helps build scalable and maintainable software by organizing code in a clear and modular way.

• It improves code readability and helps developers manage complexity as the application grows.
• It simplifies testing, maintenance, and collaboration within development teams.

Step By Step Procedure

Step 1: Create Spring Boot Project

First go to spring initializer and create a new project using the following information

• Project: Maven
• Language: Java
• Spring Boot: 3.0.0
• Packaging: JAR
• Java: 8 
• Dependencies: Spring Web, Spring Data JPA, H2 Database

Click on Generate which will download the starter project. 

Step 2: Extract Project

Now extract the given folder and then open this project in your preferred IDE, I'll use IntelliJ Idea Community edition for that, To open this just click on open and then select the extracted folder from your files.

After opening the Project you'll see the following screen

Step 3: Folder Structure

Now we'll structure our project and for that, we are going to create our packages we'll make sure we create packages and use them to make our file tree better to read and interpret. We'll mostly use the following packages and create classes and interfaces in these packages :

• Controller: It will contain all classes and interfaces related to controllers.
• Repository: It will contain all the repositories-related interfaces and classes. 
• Service: It will contain all the business logic-related interfaces and classes. 
• Model: It will contain all the models in form of classes.
• Exceptions: It will contain all the custom exceptions

To create a package go to the following folder -> src -> main -> java -> com.example.demo. Now right-click on this folder -> new -> package -> give name -> press enter

Step 4: Package Structure

Create 4 more packages and we'll get the following structure for our packages

This is going to be the project structure that we are going to use also depending on your use case you can create more packages and create classes inside them. Example - Security

Step 5: Now we can create classes inside all the packages depending upon the requirements and can create the best way so that any other developer can manage your project easily.