The ability for this to work correctly really lies more with the Thread strategy employed by your servlet engine, and less on Struts.... in order for this to work as designed you need to make sure that your Servlet engine is configured to use a multi-threading model (which is the out of the box default for most...)
At 04:32 AM 10/22/2003, Yu Xiang Xi (Maveo) wrote:
Hi, this is a combination question about both log4j and struts.
For the MDC is managed on a per thread basis, we can use it to log the user IP address in the web application. While, as I remember, struts action class is designed to be thread-safe. If I try to log the user IP address in the execute () method of struts action class,
For example public ActionForward execute(ActionMapping actionMapping, ActionForm actionForm, HttpServletRequest request, HttpServletResponse response) throws Exception { String username=session.getAttribute("user"); MDC.put("userip",request.getRemoteAddr()); logger.info(username+" login"); .. }
Will the unexpected case happen?
1. UserA from 192.168.0.1 login, and the MDC put 192.168.0.1 to the MDC 2. UserB from 192.168.0.2 login, and the MDC put 192.168.0.2 to the MDC(now the userip in MDC is updated) 3. UserA executed the code logger.info(username+" login"); 4. UserA executed the code logger.info(username+" login");
so the log4j output maybe look like [192.168.0.2] UserA login [192.168.0.2] UserB login
Actually the assumption is [192.168.0.1] UserA login [192.168.0.2] UserB login
Best Regards Xi Yuxiang
System Architect Maveo Systems Limited - www.maveosystems.com
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