Struts provide two classes ValidatorForm and ValidatorActionForm for validating form fields. Instead of doing basic validation by using the validate() method in Action class, these classes allows you to leverage rich feature of validation framework provided by Jakarta Struts framework. You can do declarative validation by defining rules in XML config files like validation-rule.xml or validations.xml as well. Since Struts is one of the popular Web MVC frameworks, you can also use its validation framework on any Java web application implemented using Struts. Now, coming back to the question, what is the actual difference between ValidatorForm and ValidatorActionForm in Struts? They both look quite similar, right?