What’s New > Windchill > 12.0.2.0 > Deployment and Configuration > Support for Log4j 2.0
  
Support for Log4j 2.0
Product: Windchill
Release: 12.0.2.0
Summary
Starting with this release, the third-party library used for logging in Windchill is upgraded to use Log4j 2.0. This upgrade is intended to take advantage of the security improvements incorporated in Log4j 2.0. All Windchill OOTB Log4j classes, appenders and configurations are now compatible with Log4j 2.0.