I'm using LOGBack as slf4j implementation together with the bridges between legacy APIs and LOG4J in my OSGI enterprise app - I'm also using my own bridge between OSGI LogServices and SLF4J. I like the Markers from LOGBack and use them to log the OSGI Bundle- and Sercvice Names. All will be documented in my blog (the first 3 parts of my blog series "Logging in OSGI Enterprise Applications" are published till now) Now I'm interested to see the differences between Log4J and LOGBack. I already know about the Markers, which are important for me - are there any other differences ? thx ekke -- ekkehard gentz software-architect erp-consultant max-josefs-platz 30, D-83022 rosenheim, germany mailto:ekkehard@gentz-software.de homepage: http://www.gentz-software.de opensource: http://ekkehard.org blog (en): http://ekkes-corner.org blog (de): http://ekkes-ecke.org skype: ekke.gentz Steuer-Nr: 156/220/30931 FA Rosenheim, UST-ID: DE189929490