Why it matters

Input validation is defense line 1. Understanding shapes safety.

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The architecture

Length cap.

Format check.

Safety classifier.

Reject or normalize.

Input validation stackLength limitcap tokensFormat checkschema / regexSafety filtercontent classifierBean Validation (Hibernate Validator) works well for structured inputs in Java
Input validation.
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How it works end to end

Length: max tokens / chars.

Format: JSON Schema, regex.

Bean Validation annotations.

Safety: Llama Guard, moderation.