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Struts Action 2 relies on a validation framework provided by \[WW:XWork\] to enable the application of input validation rules to your Actions before they are executed.  This section only provides the bare minimum to get you started and focuses on our extension of the XWork validators to support client-side validation.

There is also an option for Client Side (Javascript and/or AJAX) based validation, please see Client Side Validation for more information.

When using a Field Validator, Field Validator Syntax is ALWAYS preferable than using the Plain Validator Syntax as it facilitates grouping of field-validators according to fields. This is very handy especially if a field needs to have many field-validators which is almost always the case. Examples: validatortypes

{snippet:id=javadoc|javadoc=true|url=com.opensymphony.xwork.validator.ValidatorFactory}

{snippet:id=validators-default|javadoc=false|lang=xml|url=https://xwork.dev.java.net/source/browse/*checkout*/xwork/src/java/com/opensymphony/xwork/validator/validators/default.xml?content-type=text%2Fplain}

{snippet:id=turningOnValidators|javadoc=true|url=com.opensymphony.xwork.validator.ValidatorFactory}

{snippet:id=exTurnOnValidators|javadoc=true|lang=xml|url=com.opensymphony.xwork.validator.ValidatorFactory}

{snippet:id=fieldValidators|javadoc=true|url=com.opensymphony.xwork.validator.ValidatorFactory}

{snippet:id=nonFieldValidators|javadoc=true|url=com.opensymphony.xwork.validator.ValidatorFactory}

{snippet:id=validatorsNote|javadoc=true|url=com.opensymphony.xwork.validator.ValidatorFactory}

{snippet:id=validationRules1|javadoc=true|url=com.opensymphony.xwork.validator.ValidatorFactory}

{snippet:id=exValidationRules1|lang=xml|javadoc=true|url=com.opensymphony.xwork.validator.ValidatorFactory}

{snippet:id=validationRules2|javadoc=true|url=com.opensymphony.xwork.validator.ValidatorFactory}

{snippet:id=validationRules3|javadoc=true|url=com.opensymphony.xwork.validator.ValidatorFactory}

{snippet:id=exValidationRules3|javadoc=true|lang=xml|url=com.opensymphony.xwork.validator.ValidatorFactory}

{snippet:id=validationRules|javadoc=true|url=com.opensymphony.xwork.validator.Validator}

{snippet:id=validatorFlavours|javadoc=true|url=com.opensymphony.xwork.validator.Validator}

{snippet:id=validatorVsFieldValidators1|javadoc=true|url=com.opensymphony.xwork.validator.Validator}

{snippet:id=nonFieldValidatorUsingValidatorSyntax|lang=xml|javadoc=true|url=com.opensymphony.xwork.validator.Validator}

{snippet:id=fieldValidatorUsingValidatorSyntax|lang=xml|javadoc=true|url=com.opensymphony.xwork.validator.Validator}

{snippet:id=validatorVsFieldValidators2|javadoc=true|url=com.opensymphony.xwork.validator.Validator}

{snippet:id=fieldValidatorUsingFieldValidatorSyntax|lang=xml|javadoc=true|url=com.opensymphony.xwork.validator.Validator}

{snippet:id=validatorVsFieldValidators3|javadoc=true|url=com.opensymphony.xwork.validator.Validator}

{snippet:id=similarVaidatorDeclaredInDiffSyntax|lang=xml|javadoc=true|url=com.opensymphony.xwork.validator.Validator}

{snippet:id=shortCircuitingValidators1|javadoc=true|url=com.opensymphony.xwork.validator.Validator}

{snippet:id=exShortCircuitingValidators|lang=xml|javadoc=true|url=com.opensymphony.xwork.validator.Validator}

{snippet:id=shortCircuitingValidators2|javadoc=true|url=com.opensymphony.xwork.validator.Validator}

{snippet:id=scAndValidatorFlavours1|1=javadoc|javadoc=true|url=com.opensymphony.xwork.validator.Validator}

{snippet:id=exScAndValidatorFlavours|lang=xml|javadoc=true|url=com.opensymphony.xwork.validator.Validator}

{snippet:id=scAndValidatorFlavours2|1=javadoc|javadoc=true|url=com.opensymphony.xwork.validator.Validator}

{snippet:id=howXworkFindsValidatorForAction|javadoc=true|url=com.opensymphony.xwork.validator.Validator}