Sorry that was a typo error, I have made bookEditForm to extend ValidatorActionForm.
What is the difference between ValidatorActionForm and ValidatorForm?
Joined: Feb 15, 2005
You extend ValidatorActionForm if you specify an action mapping as the name in your validation.xml file. You extend ValidatorForm if you specify an ActionForm as the name in your validation.xml file. Since bookEditForm appears to be the name of an ActionForm, you should be extending ValidatorForm instead of ValidatorActionForm.