Howdy,
>I'll take a look into the Log4J.MDC - don't you think it would make
sense
>to provide guidelines on how to log debugmessages and exceptions in
>servlet/jsp-apps (like the App Dev. Guide of Craig)? or is there
already
>something at the log4j site you know of?
There isn't something explicit: if you write something I'll put it on
the site ;) It's fairly simple, though. For example, if you want all
session and request attributes in the MDC, from a servlet, you would do:
// Populate MDC with request attributes
MDC.getContext().put(request.getParameterMap());
// Populate MDC with session attributes
Enumeration sAttributes = session.getAttributeNames();
String name;
while(sAttributes.hasMoreElements()) {
name = sAttributes.nextElement();
MDC.put(name, session.getAttribute(name));
}
// Log
logger.info("something");
// Clear MDC to save memory
MDC.getContext().clear();
There's a gotcha here, though. You would need to declare those keys in
the MDC you want output to your log file by using %X{KeyName} in your
layout declaration. Perhaps a modification to PatternLayout is needed
to output the entire MDC. But anyways, that's to be discussed on the
log4j-user list if you're interested.
Yoav Shapira
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