One thing that can cause this is a system clock being off. Tocmat will check each JSP to see if the generated code and class are older than the source file. If so, it will regenerate. I've had new JSPs not get compiled after moving them to a server in another time zone.
Deleting the tomcat/work directory will force Tomcat to recompile all JSPs.
I may be wrong but this can be one of the solution of not caching the jsp pages <% response.setHeader("Cache-Control","no-cache"); //HTTP 1.1 response.setHeader("Pragma","no-cache"); //HTTP 1.0 response.setDateHeader ("Expires", 0); //prevents caching at the proxy server %>