Logs are not generating on linux machine. debug.properties and log4j.xml has no affect.
I removed log4j-over-slf4j from trunk (It was not referenced in .classpath) at revision: 1342893 (R12.04 r1342894) in order to have logs in official Trunk demo.
log4j-over-slf4j is part of the JCR effort which should be removed from trunk anyway since Sascha recreated a new JCR branch. I let him handle the rest...
I guess Bridging legacy APIs has not been followed in details
There is a conflict of log4j-over-slf4j and log4j.jar, Only one of them is required. I removed log4j-over-slf4j and it starts working.