The following topics are covered:
In order to accommodate to the different target runtime where it can be deployed, eXo is capable of leveraging several logging systems. eXo lets you choose the underlying logging engine to use and even configure that engine (as a quick alternative to doing it directly in your runtime environment).
The currently supported logging engines are:
Apache Log4J
JDK's logging
Apache Commons logging (which is itself a pluggable logging abstraction)