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## com.opensymphony.xwork2.validator.validators
Class RequiredFieldValidator

    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

    public class RequiredFieldValidator

extends FieldValidatorSupport

RequiredFieldValidator checks if the specified field is not null.

- 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>

Version:
  $Revision$
Author:
  rainerh

Field Summary

Fields inherited from class com.opensymphony.xwork2.validator.validators.ValidatorSupport
`defaultMessage, log, messageKey, stack`

Constructor Summary
`RequiredFieldValidator()`

Method Summary
`void` | `validate(Object object)` The validation implementation must guarantee that setValidatorContext will be called with a non-null ValidatorContext before validate is called.

Methods inherited from class com.opensymphony.xwork2.validator.validators.FieldValidatorSupport
`getFieldName, getValidatorType, setFieldName, setValidatorType`

Methods inherited from class com.opensymphony.xwork2.validator.validators.ValidatorSupport
`addActionError, addFieldError, getDefaultMessage, getFieldValue, getMessage, getMessageKey, getMessageParameters, getValidatorContext, isShortCircuit, parse, setDefaultMessage, setMessageKey, setMessageParameters, setShortCircuit, setValidatorContext, setValueStack`

Methods inherited from class java.lang.Object
`clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait`

Methods inherited from interface com.opensymphony.xwork2.validator.Validator
`getDefaultMessage, getMessage, getMessageKey, getMessageParameters, getValidatorContext, setDefaultMessage, setMessageKey, setMessageParameters, setValidatorContext, setValueStack`

Constructor Detail

### RequiredFieldValidator

    public RequiredFieldValidator()

Method Detail

### validate

    public void validate(Object object)
                  throws ValidationException

  Description copied from interface: `Validator`
  The validation implementation must guarantee that setValidatorContext will be called with a non-null ValidatorContext before validate is called.

  Parameters:
    `object` - the object to be validated.
  Throws:
    `ValidationException` - is thrown if there is validation error(s).

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