java.lang.Object
   com.opensymphony.xwork2.validator.validators.ValidatorSupport
      com.opensymphony.xwork2.validator.validators.FieldValidatorSupport
         com.opensymphony.xwork2.validator.validators.RequiredFieldValidator

All Implemented Interfaces:
    FieldValidator, ShortCircuitableValidator, Validator

• fieldName - field name if plain-validator syntax is used, not needed if field-validator syntax is used

<validators>

<!-- Plain Validator Syntax -->
<validator type="required">
<param name="fieldName">username</param>
<message>username must not be null</message>
</validator>


<!-- Field Validator Syntax -->
<field name="username">
<field-validator type="required">
<message>username must not be null</message>
</field-validator>
</field>

</validators>

author: rainerh -

version: $ - Revision: 1063 $

 public  void validate(Object object) throws ValidationException 
{
        String fieldName = getFieldName();
        Object value = this.getFieldValue(fieldName, object);
        if (value == null) {
            addFieldError(fieldName, object);
        }
}