when i call the application using the following url : http://localhost/Struts2App/user_login.action i reach the login page (userJSP.jsp). But when i enter the username and password and submit it should ideally execute the userLogin() method in the action class siince the <s:form> tag has value of action attribute as user_login!userLogin . it means it should execute the userLogin method of the action named user_login but it executes the default execute method of the action user_login. why so ? when i am specifying in the form tag which method i want to be called then why is it executing the default method.