The problem  occurs because your textbox is set to show the values  of some object(i.e) that everytime the form is called to be parsed, the core of struts  seeks for the object values in a DB table or .properties file.
So you have to set another formbean or object to be read of in your struts configuration file (struts.xml) for the failure action besides the success action.
Be in touch if you've got more Qs.