Spring Boot OpenAPI ChatGPT API Integration Tutorial | Step-by-Step Guide [2025 Edition]

🚀 Learn how to integrate OpenAI’s ChatGPT API with a Spring Boot application using RestClient. Follow this step-by-step guide to build an AI chatbot that communicates with OpenAI's GPT models.

I am a bestseller Udemy Instructor. Check out my top 10 Udemy courses with discounts: My Udemy Courses — Ramesh Fadatare.

🔹 Introduction: Why Integrate ChatGPT with Spring Boot?

With the rise of AI-powered chatbots, integrating OpenAI’s ChatGPT API into Spring Boot applications has become a powerful way to enhance user experience, automate responses, and create intelligent applications.

In this tutorial, we will cover:
✅ How to configure OpenAI’s API in Spring Boot
✅ How to use RestClient (a modern alternative to RestTemplate)
✅ How to build a REST API that interacts with ChatGPT
✅ How to create a simple chatbot using Spring Boot and OpenAI API

By the end of this guide, you will have a fully functional AI chatbot built with Spring Boot, Java, and OpenAI’s GPT models.

🔹 Prerequisites

Before we start, make sure you have the following:
✔️ Java 23 or higher (Java 23 recommended)
✔️ Spring Boot 3.x
✔️ An OpenAI API Key (Get one from OpenAI API)
✔️ Maven for dependency…