What error type does the Validation module raise?

• A. VALIDATION:ERROR
• B. VALIDATION:*
• C. VALIDATION:FAILED
• D. VALIDATION:NONE

Answer: (B)

Understanding how error types are structured in MuleSoft helps you write flexible error handling. In Mule 4, errors are categorized by a namespace and a code, and you can use a wildcard to catch all errors from a module. The Validation module uses a general form with a wildcard: VALIDATION:*. This means any error that originates from the Validation module will have a code starting with VALIDATION:, followed by a specific subtype, and the wildcard allows you to handle all of those validation-related errors with a single handler.

That’s why this option is the best: it provides a catch-all for every Validation module error, rather than tying you to a single specific subtype that may not cover all scenarios. The other forms don’t align with how the Validation module reports its errors and wouldn’t reliably catch all validation issues.