Which message processor will throw an exception if a message payload is not a number?

• A. Is String validator.
• B. Is Number validator.
• C. Is Integer validator.
• D. Is Numeric validator.

Answer: (B)

The main idea is to enforce that the payload is a numeric value type. The Is Number validator checks whether the payload is an instance of a numeric type (such as Integer, Long, Float, Double, BigDecimal). If the payload isn’t a number, it immediately throws a validation exception, making it the exact tool for ensuring the message carries a numeric value. This works for any numeric type, not just integers or strings that look numeric.

Other validators focus on different kinds of data. The Is String validator would throw if the payload isn’t a string, which is a different requirement. The Is Integer validator would accept only Integer values, so a Double or Long wouldn’t pass, even though they are numbers. The Is Numeric validator often targets numeric strings or specific numeric formats, so it may not consistently enforce that the payload is a Java Number type.