Hugging Face /hf-inference/v1/chat/completions returns 422 in Eclipse plugin

I'm building an Eclipse plugin for code completion using the Hugging Face API. My plugin sends a prompt to the endpoint:

https://router.huggingface.co/hf-inference/v1/chat/completions

I replaced the old endpoint (https://api-inference.huggingface.co) as recommended.
Here’s my Java request code:

String json = "{" + "\"inputs\": \"" + safePrompt + "\"" + "}"; RequestBody body = RequestBody.create(json, MediaType.parse("application/json")); Request request = new Request.Builder() .url("https://router.huggingface.co/hf-inference/v1/chat/completions") .addHeader("Authorization", "Bearer " + hfToken) .post(body) .build(); try (Response response = client.newCall(request).execute()) { System.out.println(response.code()); System.out.println(response.body().string()); }

When I run this, I always get:

Response code: 422 Raw body length: 24

Can someone suggest a free Hugging Face model that works for code completion in Java/Eclipse?