Apache Struts 2 Documentation > Home > Guides > Core Developers Guide > Annotations > FieldExpressionValidator Annotation
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This validator uses an OGNL expression to perform its validator. The error message will be added to the field if the expression returns false when it is evaluated against the value stack.

Usage

The annotation must be applied at method level.

Parameters

Parameter Required Default Notes
message yes   field error message
key no   i18n key from language specific properties file.
fieldName no    
shortCircuit no false If this validator should be used as shortCircuit.
expression yes   An OGNL expression that returns a boolean value.

Examples

@FieldExpressionValidator(message = "Default message", key = "i18n.key", shortCircuit = true, expression = "an OGNL expression")