[logback-user] Logs are written in wrong file when changing log level.

Hi I am using slf4j 1.7.5,logback 1.0.3. In my app i am using application context to set app name as per given example. http://logback.qos.ch/faq.html Is it possible for multiple JEE applications to share the same configuration file but without stepping on each other's toes?<http://logback.qos.ch/faq.html#sharedConfiguration> Every thing is fine intially and one common xml file is writing in different log files but when i am changing log level its not reading applicationName and start writing in "application-name_IS_UNDEFINED1.log" File. Why this behaviour?