How do you differentiate log4j sessions in a log file from copies of the same web-app?

Question

There is only one file. And it is written simultaneously as web app copies run.

How do you filter only one session log messages from other log lines?

Answer 1

Here is a page that sets up an MDC filter for web-app -> http://rtner.de/software/MDCUserServletFilter.html

Being a servlet filter it will free you from managing MDC/NDC in each of your servlets.

Of course, you should modify it to save information more pertinent to your web-app.