Spring AI 2.0 Adds Self-Correcting JSON Validation to Fix LLM Output Errors

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Spring AI 2.0 introduces a self-correcting structured output feature that automatically retries when a language model returns invalid JSON. Developers can enable it with a single method call, validateSchema(), which activates a built-in retry loop powered by StructuredOutputValidationAdvisor. When a model's response fails schema validation, the specific error message is fed back to the model so it can correct its output on the next attempt. The mechanism supports up to three retry attempts by default and is particularly useful when working with smaller open-source models like Llama 3.2 running locally, which are more prone to malformed responses. The feature was highlighted by Dan Vega, Spring Developer Advocate at Broadcom, and documented by Christian Tzolov of the Spring AI team.

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