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The required field validator in Struts can be used to check if field is non-null. It can be used in either of the following forms:

Since Struts 1.1This tag library brings a nested context to the functionality of the Struts custom tag library.It's written in a layer that extends the current Struts tags, building on their logic and functionality.

• • XML: using type=”required” attribute in <validator> or <field-validator> elements.
  • Annotation: using @RequiredFieldValidator annotation type to annotate setter method of the field or action method (plain-validator).

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One example usage of this validator is to validate a field whose value is pulled from a dropdown list which may contain no items (the items are generated dynamically).

1. Struts Required Field Validator XML

Usage:

• Field-validator syntax:
  
• Plain-validator syntax:
  

Parameters:

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Parameter name	Description
fieldName	Name of the field to validate. Required if using plain validator syntax.

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Struts Required Field Validator XML Examples:

• Field-validator example:
  
• Plain-validator example:
  

2. Struts @RequiredFieldValidator Annotation

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Usage: Put the @RequiredFieldValidatorannotation before the setter method or action method (in case of using plain-validator) in the following form:

@RequiredFieldValidator(param1 = 'param 1 value', param2 = 'param 2 value', ..)

Parameters:

Parameter name	Required	Default value	Description
message	Yes	validation error message.
key	No	i18n key for validation error message.
messageParams	No	Additional parameters to customize the message.
fieldName	No	Specifies field name in case this validator type is plain-validator.
shortCircuit	No Key generator for software free download.	false	Whether this validator is short circuit.
type	No	ValidatorType.FIELD	type of the validator: field-validator (FIELD) or plain-validator (SIMPLE).

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Struts @RequiredFieldValidator Examples:

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• Basic field-validator:
  
• Specifying i18n key for the message:
  
• Plain-validator (annotating the action method):
  

Related Struts Form Validation Tutorials:

Other Struts Tutorials:

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