User management by using Spring Boot and PostgreSQL

Here's a step-by-step guide to building REST APIs using the Java Spring framework with PostgreSQL for the specified endpoints:

1. Set Up Your Spring Boot Project

Create a New Spring Boot Project:

Use Spring Initializr (https://start.spring.io/) to create a new project. Choose the following dependencies:

• Spring Web
• Spring Data JPA
• PostgreSQL Driver

Configure the application.properties:

2. Create the User Entity

3. Create the User Repository

4. Create the User Service

5. Create the User Controller

6. Run Your Application

• Ensure PostgreSQL is running and the database is created.
• Run your Spring Boot application.
• Use tools like Postman or curl to test the endpoints.

7. Test Your API

• GET /users: Retrieve all users.
• GET /user/{id}: Retrieve a user by ID.
• POST /user: Create a new user.
• PUT /user: Update an existing user.
• DELETE /user/{id}: Delete a user by ID.

Reference Documentation

For further reference, please consider the following sections:

• Official Gradle documentation
• Spring Boot Gradle Plugin Reference Guide
• Create an OCI image
• Spring Web
• Spring Data JPA

Guides

The following guides illustrate how to use some features concretely:

• Building a RESTful Web Service
• Serving Web Content with Spring MVC
• Building REST services with Spring
• Accessing Data with JPA

Additional Links

These additional references should also help you:

• Gradle Build Scans – insights for your project's build