Hi, I am having the issue described below, sorry for the long post but I think that is required to better explain the problem. I want to separate out the logs in such a way that some special packages, classes needs to go in specific log format and rest of the logs will go in default format. I have created the multiple file, Syslog appenders with all the required formats. But I am having difficulty configuring in such a way that the log messages from packages other than my special packages will go with the default appender. Initially my idea was to map the basic outer package to all the special appenders as well as to default appender, create a filter for each special appender so it will only take the specific package logs only. But the problem is that default appender takes all the log messages. I can again implement a filter for the default appender so it will take all the excluded log s only but probably it it will be lot of processing unnecessarily, evaluating the same criteria again and again for each logging request. Is there any way so I can intercept each logging request such that I can decide which appender I need this logger to map to (by implementing some java routine), put the result in MDC context and make use of that result variable in the configuration to associate the required appender (using if-else syntax)? I saw that Sifting appender might be helpful in this scenario but I don't know where I can put my processing logic to decide which appender I want the logger to associate to so I can use its result as discrminator. Any ideas? Thanks, Pradnya