Ajax with Struts2

My question is ... When I use this code Business in between action form ,then I got warning like WARNING: Parameters: Invalid chunk ignored. and ajax action is not performed. please answer to my question very urgent

Re: struts2 access session Id

use this code you will get session id code is ServletActionContext.*getRequest*().getSession().getId();

interceptors

when I use intercepters in Struts.xml in Struts2 application for validation,I got an Exception starting filter struts Unable to find interceptor class referenced by ref-name staticParams - interceptor-ref - file:/C:/Program%20Files/Apache%20Software%20Foundation/Tomcat%205.5/webapps/CAMPUZZ/WEB-I