The logs of eXo Platform are controlled by the Java Logging API.
By default, the logs are configured to:
log errors and warnings on the console.
$PLATFORM_TOMCAT_HOME/logs/platform.log (in Tomcat) or
$PLATFORM_JBOSS_HOME/standalone/log/server.log (in JBoss).
The logs are configured via the file:
$PLATFORM_TOMCAT_HOME/conf/logging.properties (in Tomcat).
Please refer to Tomcat's Logging Documentation for more information on how to adjust this file to your needs.
$PLATFORM_JBOSS_HOME/standalone/configuration/logging.properties (in JBoss).