cached template ??

Dears, My problem is i am having a cached template that has some java code written in scriptlet at the beginning of the JSP page, this page is called by ajax calls that retrieves the whole template again, The question is why the java code is processed at the first call only not with the next calls, i need to process the java code at the top every time i call the template what i tried to do is that i changed the template to cached and it worked well then but for reasons i dont know after couple of