LLM-as-a-Judge in Spring AI: A Practical Guide Imagine you have just built a Spring AI application that answers customer questions from your company's knowledge base. The application works beautifully in your local environment. You ask, "What is your refund policy?" and the AI gives a clear, confident answer. But then comes the uncomfortable question every developer eventually asks: How do you know the answer is actually good? Traditional software gives us familiar ways to test this. We can assert that a method returns the expected value, check whether an API returns HTTP 200, or verify that a database contains the expected record. Generative AI is different. The same question can produce different answers, and a response can sound perfectly convincing while being incomplete, irrelevant,