How to Seamlessly Integrate DeepSeek AI into IntelliJ IDEA for Java Development

Preparation

Ensure you are running IntelliJ IDEA 2023.x or newer and have Python 3.7+ installed and added to the system PATH, because the DeepSeek assistant runs on a Python backend.

python --version

Install the CodeGPT Plugin

Open IDEA, go to File → Settings (Windows/Linux) or IntelliJ IDEA → Preferences (macOS).

Select Plugins → Marketplace and search for CodeGPT.

Click Install and restart IDEA when prompted.

Configure DeepSeek

Create an API Key

Visit https://www.deepseek.com/, open the API Open Platform, and generate a new API key.

Set Up DeepSeek in IDEA

In IDEA, open the CodeGPT settings, choose Custom OpenAI, and fill in the following fields:

API Key – paste the key created in the previous step.

Chat model – set the URL to https://api.deepseek.com/chat/completions and the model name to deepseek-chat.

Inference model – use the same URL, set the model name to deepseek-reasoner, enable Enable code completions and Parse response as Chat Completions, and choose the FIM template DeepSeek Coder.

Using DeepSeek

Generate Code

Open the CodeGPT panel, select Custom OpenAI, and type a prompt such as “Write a Java method to filter numbers and provide a test”. DeepSeek returns the following code:

public class TestNumberFilter {
    public static String filterNumbers(String input) {
        // Use regex to keep digits only
        return input.replaceAll("[^0-9]", "");
    }
    public static void main(String[] args) {
        String testInput2 = "SSFSDFS结论萨芬122432的噶大都是4无人区是14认识832safsss";
        String result = filterNumbers(testInput2);
        System.out.println("Filtered numbers: " + result); // Output: 123456
    }
}

Code Completion

While typing code, press Ctrl + Space (or your custom shortcut). DeepSeek analyses the surrounding context and suggests the next tokens, dramatically speeding up coding.

Code Explanation

Select a code fragment, right‑click, choose CodeGPT → Explain. DeepSeek returns a natural‑language description of the logic and purpose of the selected code.

Ask Questions

Highlight code or write a problem description, then choose CodeGPT: Ask Question. The assistant provides targeted solutions, debugging tips, or alternative implementations.

Usage Statistics

DeepSeek usage can be monitored on the official dashboard; it shows daily token consumption, request counts, and the corresponding cost, helping you stay within quota.

Conclusion

By following these steps you integrate DeepSeek into IntelliJ IDEA, gaining AI‑driven code generation, completion, explanation, and troubleshooting capabilities that boost Java development productivity.