How can I find the real path to servlet class

Question

Hi,
I am facing an issue. Am in the process of creating a filter which would send a Last-modified along with the header. For this I will be checking the is-modified-since
header and lastModified date of the file.
The problem I am facing is that after taking the file part from the request and checking
the lastmodified date, it gives error. This is because i use,
String real_path = getServletContext().getRealPath(request.getServletPath());
and it would return the path to servlet-name and not to servlet-class, since servlet-name
is not physically present. It would return an error value.
Is there any way which I could find the real path to my servlet class file ?

Answer 1

Remember you should not take the last mnodified date
of the class file or the jar file that contain the
class as the value for the getLastModified method
becouse the last modified date that should be used in
the caching is the last modified date of the dynamic
content that the servlet is about to prodice.
The same class file will produce different content
for different requests if not why do you use
servlets you can directly use the static contentThanks for a valuable remark.
Hence our getLastModified() often returns System.currentTimeMillis() result.