As part of Struts Framework, we can develop the Action Servlets and the ActionForm Servlets and other servlet classes.
In case of ActionForm class, we can develop the validate() method. This method will return the ActionErrors object. In this method, we can write the validation code.
If this method returns null or ActionErrors with size = 0, the web container will call execute() as part of the Action class.
If it returns size > 0, it will not call the execute() method. It will rather execute the jsp, servlet, or html file as the value for the input attribute as part of the attribute in the struts-config.xml file.
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